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Questions related to ANSYS
I get an error saying that my model is not sufficiently constrained when I connect solid element having 3 degrees of freedom to a shell / beam element having 6 degrees of freedom.
Is there a way elements with different degree of freedom can be connected in ANSYS APDL?
A rigid link or something?
I performed transient structural analysis on a shaft geometry as a result I got the amount of thermal deformations. shaft geometry has different diameters on the surface, how to calculate the increased diameter or thickness for different areas of shaft i.e. after deformation.(without using code)
I have already made a 3D printed PLA part using FDM method and now I want to do a FEA(FEM) simulation of tensile test. Can anyone guide me which software I must chose and what is the procedure?
I am currently working on an axial pump. The original geometry didn't perform as well as I expected, so I plan to improve its performance. But all the ANSYS tools I tried either didn't work or didn't give me control over the variables I wanted, so I decided to use C code.
Is there any way to link the C code to Ansys CFX?
Thank you very much.
Dear Researchers :
Recently I asked an official quotation (with all the requiered concepts) from ANSYS and from COMSOL to implement the same type of License and the same set of modules, the scheme of the License are not exactly the same , but very close ,
For both software I'm interested in being able to solve applications with the Structural Mechanics Module and the Electromagnetic Module
But in general, If I place both final prices in the same footage, I realise ANSYS is always more expensive (at least today) than COMSOL (roughly between 35 - 40 % more)
Does anyone with experience in this may know one of the reasons why this is so ?
I want to find out the volume of material remove by wire edm process for that i have to find out crater radius and depth.
If file will extract in stl file format than i can easily measure the radius and depth in solidwork.
please suggest me what i have to do.
If any other method which is accurate and precise than please let me know.
I want to connect two nodes by using a multipoint constraint element MPC184 ( rigid beam / rigid link)
at first, i tried connecting both nodes by a line and then mesh the line and give it MPC184 element attributes but I cannot create a line from node to node on ANSYS. Only from keypoint to keypoint.
The attached image shows what i mean.
how to fix that?
thanks alot for your support
I got up with a doubt , for simulation normally we use ansys or abacus of tensile testing . But when it come to polymers tensile testing which software need to be used. as the infill pattern will change the effect of fracture , what software we need to use for simulating tensile testing of specimen's. if we go with ansys the dog bone will be treated as simple structure but not infill parameters. can some one clarify my doubt please
need software suggestion to do testing simulation.
I want to model resistance spot welding in ANSYS APDL. How to model heat generation, which happens in the highest amount at contact of two sheets? How to model electrical contact resistance or conductance?
Recently, I was simulating the tutorial file "SIEngine_PortInjected_AMG_Tutorial.ftsim". After the simulation completed I got some results. I have some basic questions that make me doubt the solver, maybe I am wrong.
The questions are as follows:
- 100% combustion efficiency. ( On which basis combustion efficiency is calculated? ) I calculated fuel mass multiplied by LHV which is greater than the chemical heat release rate. How is that possible? This seems like an ideal case.
- UHC is almost zero. How is this possible?
- Fuel Mass per Engine Cycle is showing 2.07651E-002 [g], whereas in the excel sheet iC8H18 concentration is 2.18E-002 gram before combustion. Why there is a deviation?
- Fuel Lower Heating Value per g 44.00000 [kJ]. This LHV value remains the same if I change the combustion from gasoline to CNG also. I guess it may affect results also.
Please answer these questions.
How can I measure phase difference between two points in a model in ANSYS HFSS? The model has one port that is excited by lumped port and I am using driven terminal. I want to know that is there any way that I measure phase difference between the input and another point in the model?
i started work in simulation on iron ore pot sintering process. in this how to give sinter mix( mixture of iron ore fines + coke breeze+ dolamite fines+ limestone fines) data in ansys fluent.
Hello, this question is intended to those who have experience in designing electrical machines using ANSYS RMXprt software. I am not being able to select a material of my choice, when it comes to designing the winding of any machine. Suppose I am designing an induction machine and for some reason, I want the stator winding to be made of aluminum instead of copper. I am not being able to do that. The RMXprt software takes copper by default and I cannot find any provision to change it. Any suggestion regarding this is welcome. Thanks in advance.
I am doing simulation about archimedes screw turbine with ansys fluent. But, the continuity do not converge. It always increasing and become floating. The boundary condition is same like the teory. Any suggestion all?
Thank you very much
Post processing is done successfully, meshing is done successfully but when I get to the running of solutions it gives error after sometime
I am trying to simulate buckling phenomenon of ion source grids under thermal load in vacuum.Two grids namely screen grid and acceleration grid made of SS304 are mounted on a SS flange.The grids are electrically isolated from each other and SS flange by ceramic bushes.The inter grid spacing is maintained by brass spacers.I want to fix the grids at the bolting location so that it does not have any deflection there.A heat load of 300W is applied on the face of screen grid which faces the flange.There are no apertures in the model as it is just a preliminary study.The thickness of each grid is 1mm.
Following are my questions.
- What kind of contact(bonded,rough,frictional etc) should i define between brass spacer and grid and brass spacer and ceramic bushes to get proper deflection results?
- On what faces of the assembly should I define radiative boundary conditions? (Just 2 grids or even bolts,nuts, flange etc)
- Which area of the assembly should contained the fine mesh size? Since I am using a regular 8GB desktop I am not able to make meshes <2mm element size.What is the criteria for choosing mesh size?
- How can I know that the output by ansys is correct? (i.e the direction in which the grid buckles is right or wrong?).
I have attached picture of a sample run output for understanding.I have labelled all the components in the geometry.Please feel free to ask if you need any other details.
Working on analysis after assigning everything when I click on solve error popup saying invalid name selection how to resolve this can anyone help me out with this, please
I want to make a model for turbulence in Ansys. In the project a fan is used which is completely submerged in water. How to proceed in this situation ?
when using streamline "surface streamline" in an area between two blocks, streamline disconnected as mention in the pic attached
thanks for your help
Currently, I am conducting pressure based transient incompressible fluid flow in viscoelastic tube in ANSYS fluent and I would like to create an absorbing boundary condition in the outlet of the tube.
ANSYS Fluent already include non-reflecting outlet boundary conditions (NRBC) but only applies for ideal gas (compressible) flow.
With Pressure Far Field BC, it is available only when density is calculated using ideal gas law.
With Outflow BC, it cannot be used for unsteady flow with variable density.
So, the last option is using UDF in the outlet of the tube and I have difficulty applying it.
I found a thesis that similar to my research approach. (https://folk.ntnu.no/leifh/alumni/2013_Merethe_Sirevaag_Hansen.pdf)
And I would like to create such boundary condition in ANSYS fluent.
In page 27 of the thesis, under Section 3.2 Boundary Conditions, in Subsection 3.2.1, the author applied reflection free boundary condition at the outlet of the vessel. I have short knowledge of how to apply the boundary condition at the outlet of a vessel.
I am learning UDF in ANSYS Fluent, but I am not sure how to apply boundary equation (Eq 104, page 28) at the outlet. I assume it will require to use UDM but the equation require to use the volume flow rate value from previous space step.
I manage to calculate in numerical analysis but Can someone show a tutorial to put Eq 104 in UDF of ANSYS fluent?
What is the shell orientation mean in ANSYS APDL?
Does it mean that if I have a shell on the XZ plane then I set the orientation as 0 degrees as shown in the pictorial view
and if I have a shell on the XY plane then I set the orientation as 90 degrees?
Or does it mean something else? Like the direction of the fibers in the material?
I'm going to analysis of theorical RC beam by FE nonlinear analysis then verify the RC beam models with FEA softwares.
User-Defined Function (UDF) in ANSYS Fluent to define the heat generation source of a Li-ion battery.
I got stiffness matrix by using HBMAT, and convert it to sparse matrix.
But I don't know the order of DOFs. Cause the equation K*D=F cannot be satisfied.
K is stiffness matrix, D is nodes' deformation, F is load vector.
I need to know the order of DOFs, anyone can give me some suggestions?
Thanks a lot.
In a non-linear, implicit Process (2D), I start with anisotropic Settings and three E-Moduli for the three Directions of Freedom. When I use a hardening Model in ANSYS (Kinematic Hardening or Isotropic...), will that cause Anisotropy during the Simulation-Process? Will it be taken into account during the calculation?
Thx in advance
I have been carrying out an ANSYS Fluent CFD analysis of the system outlined in this paper:
Broadly speaking, my results are as expected for the setup and I'm very happy with them. However, I am missing one crucial aspect; the cyclone cooling effect shown in Fig. 6 is not observed in my results. I'm confused as to why this is the case. The air accelerates and swirls as expected. I have tried modelling the air using the Boussinesq approximation, as an ideal gas and as a real gas but the issue persists. Perhaps I'm not fully grasping the mechanism causing this cooling.
I'm not 100% sure the boundary conditions I set up are correct. Both the inlet and outlet are pressure boundaries with 0Pa gauge pressure. The inlet is at 300K and the backflow from the outlet is at 288K. I wasn't sure if I should set the gauge pressure for the outlet to a negative value to account for the change in pressure with altitude, or if the system deals with this. The solar flux is modelled by using the inbuilt solar loading and works as expected creating a temperature rise across the collector. Even velocities of the updraft are of the correct order according to quick calculations. I'm a bit lost as to where I have gone wrong, any help would be appreciated.
I have built a RVE in Ansys and I know the equation of periodic boundary condition. However, I'm struggling in applying the equation in Ansys. I have read some thesis that they are using constraint equation or APDL. Which method should I use?
There are various macros to define user define function to incorporate the chemical reaction but as i am dealing with the gas-liquid chemical reaction and i can not find any such category of chemical reaction in ANSYS UDF manual.... For reference I have attached a screenshot of a research article.
Can anyone please help me to define a UDF to incorporate the reaction kinetics in Ansys Fluent?
I am interested in the mathematical apparatus for this process, as well as the method of step-by-step modeling in the specified FE complex.
As MMCs are not available in ANSYS, i am looking to use DIGIMAT-FE for modeling and then use it in ANSYS.
Or have someone used COMSOL for the same?
I am modeling a bridge on ANSYS APDL using shell and beam elements. The beams and slab are connected using MPC184 (constrained element).
After I am done modeling and meshing I merge nodes with 0.001 tolerance yet I still get an error saying meshing will produce errors. even when i tried to merge all I still get a warning / error message
After Nummrg,all / Nummrg,NODE .... future commands which depend on the node to solid model connectivity (meshing, mesh, clearing, solid boundary condition transfer, etc.) may not operate properly.
My results are wrong. Is there a step that I messed?
I am not sure whether to use boolean A glue command to glue the areas / lines of my model together.
just use merging nodes NUMMRG, node command
My model is a static linear bridge element where the slab and railings are shell elements, the beam flanges are beam elements and the beam web is a shell element.
Beam and shell elements are connected using MPC184 rigid links.
i am getting an error whenever i am running the given attached simulation on ansys maxwell 16.0.
This arrangement consists of two electromagnets housed in two coil of copper winding supplied with ac voltage as shown.
I have given excitation voltage in both the winding separately as shown and boundary condition on coil as shown.
I am using transient solution as type of solution.
Any advice you provide me will be highly valuable.
I am analyzing two adjacent interconnected rectangular channel flow patterns. The image of my numerical model is attached below.
The fluent solver was pressure based, and velocity formation was absolute. The SIMPLE algorithm was used. Laminar regime was selected and energy equation was kept on. Boundary conditions were checked carefully. Inlet velocity and pressure outlet conditions were applied. Uniform Heat flux was applied at the bottom face. Solid fluid interfaces are thermally coupled. Second order upwind equations were used for energy and momentum equations. The residuals were kept 10^−5 range, and the solution was fully converged.
I have drawn a centerline inside a mini-channel for observing velocity distribution. Is my solution right? and velocity profile having zigzag is okay? if not, pls explain.
I'm using ANSYS Fluent 2019 with Space claim, my problem is involving moisture diffusion (therefore using Species transport). I found that my h2o can never pass through the porous zone.
I have tried varous porosity value, viscous resistance, with and without UDF of different diffusivity, and even (in space claim): shared topology or without shared topology but with contact. Do anyone know how to fix this?
I modelled a air cooled heat exchanger as porous media. Also I want to add convective heat transfer using radiator model in b.c(There is air flow in the porous zone). When I define the porous media, fluent automatically creat a interior-porous in internal boundary conditions and I defined this interior-porous as a radiator, but after run the calculation there wasnt any heat exchange. Do you have a any idea why its not working ?
Thanks in advance
For my CFD simulation in ANSYS.. I need a basic understandable geometry of a membrane.... Where the process is for inorganic membrane separation of Carbon Dioxide from heated air or natural air
hello every one , my project is about magnetohydrodynamics . i'm trying to simulate fluid flow (fluid is mercury ) between two parallel plates ( dimension : L=300mm , h=3mm) in ansys fluent , we applie magnetic field transversally ( B0=3.819T) .the flow is laminair and the fluid is incompressible , the diet is stationary.The vilocity of the flow is U=0.01m/s .
my problem is the solution doesn't converge , i tried to decrease the factor of under relaxation ,but it still the same problem . i saw that sometime the problem could be in the mesh , my mesh quality is 0.8 , is it good or i should improve it ?
According to literature it is said that inoreder to simulate the residual stresses correctly in metal castings viscoplastic or elastoplastic creep material model should be used.
Does anyone have experience in developing such a model in Ansys?
I recently switched from ANSYS Mechanical to COMSOL Multiphysics. So far I was able to transfer my models to the new platform but I yet miss one feature of ANSYS in COMSOL. I hope someone is able to help me out.
What I am talking about is the ability to "couple" (Ansys term) nodal degrees of freedom. In my case this would mean that the displacement of any node in a set of nodes (a surface for instant) is equal and not predefined. We are using this feature to model one eigth of an pseudo-infinitesimal cube of material. Three surfaces of the cube are subject to classical mirror symmetry and the opposite surfaces stay parallel to allow for volume change. The x-y-surfaces are subject to u_z(x0) = 0 and u_z(x_n) = coupled.
In Ansys, this feature is available as the APDL command "CP". It is not available in the GUI. I need this feature primarily for the solid mechanics solver of COMSOL. If anyone knows the name of this feature in COMSOL or can recommend a workaround please feel free to answer.
Thank you very much,
Metals and Alloys
University of Bayreuth
If I have a rotor on two bearings, under what conditions should I use pre-stressed modal analysis and when should I run a rotordynamic analysis i.e. using the rotordynamics options in a modal analysis?
I am performing a Fatigue analysis, I am referring to the ISO standards and they always stipulate to perform the fatigue tests at a precise frequency (20 Hz). I can't see in the fatigue tools a frequency option.
Is their a way to set the frequency with ansys fatigue tool ?
thanks in advance !
I am running a simulation of a system powered purely by energy from the sun. During the daytime, the results are as expected. During the night, I expect the system to still have a large amount of motion as there should be a decent amount of heat stored in the system. However, whenever I try to run a simulation spanning 24hr, I get a floating-point error when the sun sets. Before the error, I get some anomalous data where the temperatures and velocities are way too high (out by 4 orders of magnitude or more). I really don't understand what the issue is here. When the sun sets shouldn't the solar loading just stop? Shouldn't the system just slowly use up its remaining energy until the sun rises again? Is it possible that the radiation is falling on the base of my geometry?
I think that I am misunderstanding something about the solar loading as it is this that triggers the issue. In my attempt to troubleshoot, I set up a system that was definitely stable and well defined without the solar load. Then, when a solar load was applied and I ran it in a 24hr transient simulation I faced the same issue.
Any help, advice, or a point in the right direction would be appreciated.
I am simulating a rectangular water channel. To validate my numerical results, I want to present a graph containing the enhancement of Nu for this channel with several Re. Then, I compared this variation with another's study where the hydraulic diameter is not the same, however, both channels are mini-channels.
pls download the paper given below:
In this paper - Under Section 3.1:
The authors validated their model with Fan et al., Ho et al, and Moraveji et al. However, their hydraulic diameters are not same. How is this comparison valid?
I am developing user material subroutines for anisotropic damage in orthotropic material in ANSYS APDL. So I would like to delete the elements when the damage of an element reaches a maximum value or full damage. I am storing the time history of the damage variables as internal state variables. I know the EKILL command is used to kill the element when the element reaches a certain condition. But I don't know how to access the state variables of each element during the solution phase from the APDL script and execute the EKILL command when the state variable i.e., the damage reaches a maximum value. So it would be really helpful if someone can help me with this.
I am trying to simulate the Charpy test using Abaqus, could someone specify the boundary conditions that should be taken and which model should be followed.
Should I use the Johnson Cook's model?
How much time can the simulation take on a 4 core laptop?
I tried reducing the meshing to reduce the simulation time, what effect will it have on the results?
I am presently working on project which alredy created by previous students on ansys workbench, where my work is to automatize set of variables in batch mode to genarate the data.
To do that i craeted small project, recorded python journal file and edited them to feed set of values to parameters eg:Young's modulus and results are printed out to text for each instance by running ansys in batch mode.
reference : https://github.com/kpestov/ParametricStudyAutomation (i follwed almost similar)
The example project worked perfectly fine and achived what i wanted but its not working with my actual projects where if i run the sript there will be no errors/warnings instead, at each iteration it prints out same output which is wrong.
My questions are
1. Does the warnings (not errors since the problem solved with all components with green marks, image1) which are genarated in workbench can cause problem to brakedown the script??
2. I found out that i can see some journal files in session file which named crashed but i cant really able to figure it out whats the problem, do you think these are main source of error for script to brokedown? (image 2)
3. Does anyone faced this problems or experience pleae share your thoughts.
Thank you and I eagerly waiting for your suggetions and helpful answers.
I tried to perform a response spectrum in my structure. However I can't proceed because of the error (ERROR: Data file file.db does not exist for RESUME). My modal analysis run successfully but I am getting this error when performing response spectrum. How can I fix this error?
I am currently using ANSYS 2020 R2 student version.
I want to model steel fiber distribution but I don't know how to design a math equation.
there is any way to improve this area by suggesting books or papers thank you so much.
I am performing a 3D transient analysis on Fluent. I want to capture only certain contours/vectors/pathlines at every iteration. Not all. For the moment, I have selected the option to save at every iteration, but the saving takes a lot of time, and increases the total time for the analysis. Is there a simpler way, where I can save only the parameters I want at every iteration, to speed up the process?
I'm going to perform an ANSYS explosion due to Combustion Modeling and simulation, this area of research is totally new for me. Any advice or idea or any direction to start research??
How it is possible to model Dynamic Eccentricity in Ansys/Maxwell software?
I can model the Static Eccentricity in Maxwell by changing the center of rotation from rotor center or vice versa, but I couldn't change it as a function of time, speed or position to model dynamic eccentricity in transient analysis.
Anybody could help me to model dynamic eccentricity?
Thanks in advance.
I'm exploring ANSYS's CutCell mesh method, which I think is similar to OpenFOAM's Snappyhexmesh, but with less optimization. It seems to generate good quality hex cells around complex geometry, but when I try to generate inflation, it starts creating a stair stepped mesh, and cells with poor orthogonal quality. Is there a way I can possibly improve this?
Also, is CutCell a viable mesh method?
Fluent can also handle heat transfer with fluid flow analysis and it accounts for all modes of heat transfer. Now my question is then why we need steady state thermal or transient thermal analysis standalone system? What are pros and cons of steady state thermal in comparison ansys fluent heat transfer analysis? And most importantly when to use which one?
Hello, I went through the Fluent Theory Guide and other Ansys learning resources, however I couldn't find the answers to the following issues.
Let's discuss the problem on the example of a general steady RANS k-omega case.
No slip Wall
U is set to zero, k is set to zero, omega is given by a specific equation.
1. What about pressure? Does Fluent use the zeroGradient condition for pressure on a wall? It's done by default in OpenFOAM.
2. NS momentum equations are 2nd order in space, so the boundary conditions should involve the normal derivative (e.g. dUn/dn=0), if I am not mistaken ?
3. Consequently, the turbulence transport equations are 2nd order in space as well, so should their respective derivatives be specified on a wall?
U, k and omega are specified.
4. What about pressure? zeroGradient?
5. Refering to question 2,3 - should a Neumann BC be specified for U, k, omega?
Fluent Theory guide says that all variables (apart from pressure) are extrapolated from the interior. However, that does not sound right. Imagine a highly diffusive system, wherein turbulence (or any other scalar) is diffused upstream, faster than the downstream convection. In such a case, turbulence properties at the outlet would affect the solution in the domain.
6. As a consequence, what BC are imposed for U, k, omega? Mentzer suggests "intervals" which freestream turbulence properties should be taken from. https://turbmodels.larc.nasa.gov/sst.html
Fluent specifies zero convective/diffusive flux across the symmetry plane.
7. We should specify a value of k and omega at the symmetry anyway... right? It has to be done in OpenFOAM...
Thank you very much for your time and effort, feel free to make a comment on that.
I am a mechanical engineering student. I need a project on design using solidworks and analysis using anysis. Please share some basic solidworks and ansys project with me. I will try to do. Thank you.
I have written UDF in C, using fluent macro, “DEFINE_ADJUST”, for internal steam reforming (file attached). Reforming reactions are supposed to take place inside porous anode electrode of Fuel Cell. Pre-reformed fuel mixture is used which consist of (CH4, H2, H2O, CO, CO2) species. 6 source terms are generated (5 from species, 1 from heat sink, as steam reforming is an endothermic reaction). These source terms are hooked in "Cell Zone Conditions" of fluent. UDMI, memories in Fluent are also allocated to store data for above terms (see code file). Initialization and msr_adj are also hooked, segregated solver is used. Energy, species models are tern on.
After doing all these things and running simulation, reactions are not taking place; there is no change in concentration of species at inlet and outlet. Can someone take a look on UDF and suggest me what i am doing wrong? Heat is being provided outside the porous anode to facilitate the endothermic reaction.
In the next step I shall include electrochemical reactions in this UDF taking place at the surface of anode, which are exothermic. Reforming reaction reactions will use this heat.
Hi, I wanna ask for opinions/suggestions to reduce the percentage error between experimental and simulation results in the ANSYS workbench ( static structural).
First, let me explain my research.
I have cubic lattice structure samples (60mm x 60 mm x 60 mm) made from ABS thermoplastic material using FDM additive manufacturing. These samples were compressed using INSTRON 5585 universal compression test machine. The data from the test were analyzed to get the stiffness, young modulus, yield stress, etc. However, the results from simulation using ANSYS static structural were nowhere near the experimental results. For example, to get the stiffness, I divided the exerted force to the deformation and I get +82% error (simulation >> experimental). for young modulus, I divided the equivalent stress to strain and get -234% error (simulation >> experimental). I suspect these as the factors for the error
1. The samples made from FDM AM have too many manufacturing defects (interlayer failure+ porosity), yet to try using other AM techniques.
2. During the experiment, the area used was 60 mm x 60 mm as I cannot specify exactly the contact area (much less contact area) for the lattice to the bottom platen as the machine only asked me to put in the width and length of the sample. where probably (I'm not sure) the area used in the calculation in ANSYS is the actual contact area to bottom platen.
3. The structure is simply too complex.
I've tried using actual density and young modulus I get from experimental in engineering data and use force distribution plate to the top and bottom of the samples in ANSYS environment but not much changes.
also for case #1 is there any way I can render the geometry in ANSYS to have layers and voids as in actual samples?
When I heat the structure and run the analysis, the deformation by temperature occurs, and we want to re-run the modal analysis on the deformation results.
It takes a long time to enter boundary conditions at once and run simulations.
Currently, ET is using 227.
If there's a way to solve it by using commands, could I know how to use?
I am modelling an impactor hitting a plate in ANSYS in Explicit Dynamics. I want to simulate multiple impact rather than one initital condition because whenever I try use Load Steps, it does not work well like the Load Step usage with Structural Static.
Hello, I use ANSYS explicit dynamics to simulate something and after running the simulation, I get this error message. How can we solve it?
Please suggest me how to change colour manually of imported bodies face in ANSYS DM. As option is their in View-Graphic Option- Face colouring-By named selection. But in this, while selecting named selection automatic default ansys colour were assigned. I want to assign manual colour for different bodies.
Please give suggestion
Hye all, hope all of you doing fine today.
In my case for viscosity that dependent on temperature case, supposedly I need to tick the energy equation and laminar-viscous heating, unfortunately, the simulation will be faced with an error. But when I untick the viscous heating the system can be run and get the simulation result. As per attachment location for energy and laminar-viscous in ANSYS FLUENT, my UDF for viscosity dependent temperature case and error that appears when i tick the viscous heating.Thanks..any idea guys?
I am trying to do a static structural simulation in Ansys workbench. I have tried applying the bolt pretension condition but the solution does not converge.
Bolt pretension condition:
Part2 with external threads is connected to Part1 with internal threads (tightening torque-25Nm). I have applied the bolt pretension condition to the Part2 outer surface and load 20kN.
Please find the attached image.
Do i need to select the entire Part2 or just the surface in contact with Part1.?
How do i apply the bolt pretension condition..?
Thanks in advance.
In a constant volume chamber, we did 6 hole nozzle injector to simulate gas (methane) injection simulation. As part of the inlet boundary condition, we used velocity inlet boundary condition (i.e. 25m/s) for all the nozzles.
The results obtained are so confusing
1. The mass flow rate of each nozzle is different from the other.
2. With the increase in injection velocity, the simulation fails stating "Recycling requested by state variable update" and fails finally saying timestep driven is too small.
Why this phenomenon occurs.
The constant volume chamber is closed from every side, and nitrogen is filled in the chamber.
During contact making procedure, I need to select multiple lines (say 100 lines) at a time. How can I select those lines through command in ansys apdl?
Hi , My name is Ioannis Saramantas. I am a PhD candidate in the Department of Mechanical Engineering and Aeronautics in the University of Patras, Greece. I want to perform multiple simulations with varying composite fabric thickness as a parameter and at each repeat I want ANSYS to store and export Frequency Response Tabular Data on various locations (nodes) in the structure with Harmonic Response Analysis and also tabular data from Transient Structural. Then to import them on Matlab for further analysis. Is this extension (V2.1 ANSYS Extension) what I need in my case? May you help me because I have spent many hours searching for a solution.
I am familiar with the GUI in Ansys APDL , but I don't know how code in ANSYS APDL I have been trying from many days but I don't know how to the parabolic loading for the above problem?
I'm relatively new to Fluent, and I'm performing a 2D analysis of a flow past a circular cylinder as a part of my project. The cylinder is 6 mm in diameter and the inlet velocity of 20 m/s, making the Reynold's number 7638. The drag coefficient value is around 1.97, which agrees with literature, while the coefficient of pressure value is ridiculously high. I've used a tri mesh, with 50 layers of inflation at a growth rate of 1.2. The first element size was calculated to be around 1e-5 for a y+ of 0.8, to capture boundary layer effects. This is a steady state analysis using the RANS k-omega SST model, but regardless, I don't think the value should be this high. The Cp vs length plot shows values of 500, which is much too high. I also plotted cp vs theta upto 180° (since fluent plots against length), and have attached it herewith. The nature of the graph appears okay I think, but can anyone please help me with why the cp values are so high?
I've attached a paper I'm referring to, for the cp vs theta values.
I need to measure the water depth in the cylinder ( the picture attach) that mixes with air in Ansys CFX, and I don't find an excellent expression to do that.
I'm trying to determine the lift and drag coefficient of airfoil DAE-11 for laminar flow using Ansys Fluent laminar model.
RE = 260941.0492
Number of cells = 495700
Maximum mesh skewness = 0.84481
Minimum orthogonal quality = 0.11398
Maximum aspect ratio = 163.72
Wind speed = 4.075 m/s
I had tried playing around with SIMPLE, SIMPLEC and Coupled as well as skewness correction, courant number and relaxation factors. Lift coefficient, drag coefficient and residuals for 10AoA are included in the attachment. Both coefficients never stop fluctuating. Am I doing something wrong?
It might be worth mentioning that for 0-3 AoA, both lift and drag coefficients managed to settle down around 600-700 iterations with continuity residual of about 1e-3.