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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 63 results

  1. Parametric Study in AcuSolve

    Hi, I wanted to setup the parametric study for a fan flow analysis at different operating speeds by using HST-AcuSolve. It would be really helpful if it is possible to perform parametric study using hyperstudy. Regards, Vignesh V.
  2. Hi, We are trying to simulate the HST-AcuSolve Pipe Tutorial as given in the document. We are not able to find the template_srf2.osi file for the definition of file in responses (Step-6 in page 14). Please let us know if any is missed in the document for the creation of *.osi file in the directory defined. Regards, Vignesh V. CFD_Shape_optimisation_Acusolve_HST_pipe.pdf CFD_Shape_optimisation_Acusolve_HST_pipe.pdf
  3. Hello, I am trying to run a CFD on a model in VWT in order to eventually extract the pressure on the surfaces to place them as node pressures on the same model in optistruct. Currently I am having problems getting VWT to run successfully. I have been through the troubleshooting webpage (http://forum.altairhyperworks.com/index.php?/topic/13776-workflow-for-virtual-wind-tunnel/&tab=comments#comment-20229). The Run parameters I am using are: The vwtAnalysis VOUT file is as follows: The vwtAnalysis MeshSim file is as follows: This suggests there is an error in line 65 but i do not know what this means. I am not getting a mesh intersection file if I intersect the model with the wind tunnel boundary. However, I obtain a CAD.DIR but not a MESHSIM.DIR the output folder. The link to the Nastran file: WIP_9.nas I hope you can help. Kind Regards, Elliot
  4. Hi All, Please do register for Altair Multiphysics Webinar series. Click here to register Best Regards, Kamlesh
  5. Solution Stability Issue

    Hi, Mesh independent study is performed for one operating point to fix the mesh count in one of my problem. The final fixed mesh count result was deviating by 1.5% for the selected operating point. The final fixed mesh is used to simulate for other operating points and their results deviate between 10-30%. To check the consistency of the result the simulation is conducted for different operating point to check the stability of solution and found result changes with huge deviation. If this problem persists on my cases, it would be difficult for us to relay on the tool. Requesting you to arrange for a meeting to discuss in detail about this issue ASAP. Regards, Vignesh V.
  6. Postprocessing in Paraview

    How do i open the results from acusolve simulation in paraview.
  7. I have a problem with the virtual wind tunnel. When I do the test it works perfectly but at 80% it does not progress and it closes the hw.exe. At that point you should open Acufieldview to make the captures that will be exported in the PDF. But the essay stays there and does not export the PDF. If I look in the folder Run Patch the test is finished but without the PDF. In the folder I can find all the results of the coefficients but not the PDF. Would anyone know how to solve this problem? I attach files to explain better. Thanks for your help. cilindro.nas
  8. Hi, Im facing an error while importing surface mesh in .nas format to Acuconsole. PFA the snapshot of error window. I double checked in Hypermesh for any free edges, duplicates or connectivity issues, even check for 2D mesh file is also fine. when I tried the same model in .inp format its working fine in acuconsole but .nas is not! Thanks, Elvin
  9. Uniformity Index

    Hi all, Kindly let us know how to calculate the flow uniformity through a given section/plane.
  10. Dear all, Please do register for the webinar on September 27th, 2017 (Wednesday) at 11 AM Headlamp modeling in SimLab and CFD analysis using AcuSolve Register on the link below: https://register.gotowebinar.com/register/8360683504294244097 Regards, Kamlesh
  11. Hi all For using Realizable K epsilon Turbulence model .If i use intensity and viscosity ratio What will be the optimum value of below said parameters for Internal flows Turbulent velocity scale = Turbulent viscosity ratio =
  12. Deal All, We have uploaded 2017 India ATC Technical papers - CFD for AcuSolve in the below link: http://www.altairatc.com/india/2017/2017-Technical-Papers.htm There are currently 7 CFD papers uploaded from customers, some more of them also will be uploaded. Regards, Kamlesh
  13. Fan component

    Hello all, I have been trying to model two fans together, for which i have created two seperate volumes for each fan.with seperate outlets. It is giving error as" element set Air Volume has already been assigned a component therby terminating the run .Please refer attachment. Green color: Air Volume Others two are seperate volume for two fans Please help.
  14. Conjugate heat transfer

    Hello all, I am doing CFD analysis of an electronic cabinet having 2 radial fans. Meshing is successfully done. But when I am trying to refine my volume mesh following error is being displayed " could not parse file". I have done surface meshing in hypermesh. For volume meshing in acusolve I have taken mesh size as relative with value of 0.125 . Now when I am trying to refine only air volume mesh with again relative mesh size of 0.008 it is giving error in generating mesh. Please help.
  15. How to open ".bc_warnings"

    How to open ".bc_warnings". As every time while giving run, it is asking to check this file before moving further. Regards Rajendra BorgWarner
  16. Heat pipe analysis in acusolve

    Hello everyone, I want to simulate heat pipes used in pcbs for heat transfer. But I have no idea whether this feature of condensation and evaporation is available in acusolve or not. Please help. regards, Tutulika
  17. ACUSOLVE error in boundary condition

    HI, I am new to ACUSOLVE. I have a flow problem in which I have assigned a pressure inflow and an outflow with mass flux using advanced boundary condition. When I try to run the solver, I am getting an error stating " multiple surface integrated condition at outlet" I don't understand the actual sense of this error since as far as I know, we can simulate a case with an inflow pressure and outflow mass flux. I have done similar cases in ANSYS Fluent. If somebody knows how to rectify this problem, please let me know asap. Thanks in advance.
  18. Problem in Acu console

    I was doing CFD analysis, i exported the file (nastran format) in the same way as shown in the video( Day 11, CFD analysis ). After exporting, i opened ACU CONSOLE, and created new database file, but when i tried to import the nastran file it automatically closed down showing a black screen window with an error written on it. Below is that error pic. Plz help me ASAP.
  19. Some mistake in meshing

    Hello, I'm working on a model the third day and can't understand what is the mistake in the meshing parametres. Once I got to build and can't anymore, don't understand what the problem is. sector-100mkr-1gr-narost-001.acs
  20. Hi All, Please find attached tutorial for CFD optimisation of a manifold. Some of the applications, where it can be used includes, HVAC ducting • Reduce pressure drop • Increase flow uniformity • Maximize/minimize outlet temperature Heat exchangers • Maximize pressure drop • Maximize heat transfer Brake discs • Minimize temperature • Maximize heat transfer • Brake cooling ducts External Aero • Minimize drag • Maximize negative lift and many more. I have also attached a simple Pipe CFD optimisation tutorial. Please do contact us for any queries. Regards, kamlesh Acusolve_Hyperstudy_tutorial_manifold.zip Acusolve_Hyperstudy_Tutorial_Pipe.zip
  21. Hello, I have a problem with virtual wind tunnel, when starting a simulation everything progresses normally but hwx.exe is closed and the simulation stops at 0.02%. In the video below I do all the complete simulation from hypermesh by checking the duplicate elements. At the end of the video I show the run patch. In the attached files is the .nas file and the hw. Thanks for your help.
  22. Num Krylov vector

    Hi I am Working on a Thermal Analysis problem.If i increase the Num Krylov vector from the default value. Will there be change in results or It will lead to faster convergence What will be the optimum value of Krylov vector for Thermal Problems??
  23. Dear All, Both AcuSolve (CFD) and MotionSolve (MBD) Hyperworks Solvers can be coupled, cosimulation is possible. Certain Applications being real time Aerodynamics simulations, Wind turbines, Fuel tank sloshing, Pressure check valve etc. Click here to view the webinar on AcuSolve (CFD) & Motionsolve (MBD) coupling Attached is a tutorial on the same coupling - Pressure check valve. Regards, Kamlesh CFD_MBD.zip
  24. Dear AcuSolve Users, Please find the detailed procedure of mapping AcuSolve CFD results through linear interpolation option. It has a python script attached, a pdf document explaining the process to be followed. This Script can be utilized to get all the CFD results like Velocity, Pressure, temperature etc and map it onto other mesh for further analysis. Regards, Kamlesh Script.zip
  25. Dear AcuSolve Users, Please find the attached material to run AcuSolve in batch mode. Regards, Kamlesh BatchRun_AcuSolve.zip
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