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Found 46 results

  1. Yatish Chandra

    AcuConsole Fan Rotation

    Hello everyone, I am trying to simulate axial fans located behind the radiator of a semi truck in AcuConsole. I have three sets of fans in which one set has its axis similar to global coordinate system whereas the other two sets of fans have their rotation axis inclined to the global coordinate axis. I have tried to run the simulation but I have been experiencing divergence issues. I figured out the reason for this and it appears to be with the axis of rotation of the inclined set of fans. Till now, I have been creating a reference frame where i specify the rotation center as the center of rotation for the fan and then specify the RPM using the angular velocity option along one component (X, Y or Z). This I think is wrong. Could somebody help me out with specifying the correct axis of rotation for the inclined set of fans? Should I specify different X, Y & Z components in the angular velocity section of the reference frame for the fans or should I change the 'Wall Velocity type' to 'Cylindrical' in the 'surfaces' tab, specify the cylindrical axis in AcuConsole? In that case, I was wondering if I should keep the Radial. Axial & Tangential velocity sections to 0.0 m/sec or give them a value? I have attached some screenshots which may help for reference. Thanks, Yatish.
  2. Hello, What is Nodal initial condition (Dissipation rate value & kinetic value) for Realizable K-epsilon modal? Regards Rajendra Prasad Borg warner
  3. Phil Noop

    Enclosing mesh for CFD

    Hello everyone, I picked up Hypermesh only a couple of days ago, so I still have a fair amount of trouble. My goal is to create a CFD Tetra mesh for a wing. The problem is that I cannot enclose the mesh of the symmetry surface around my wing root. There is always a small fraction that stays open. I trimmed the symmetry surface using the lines of the wing root and then deleted the resulting surface. I know that I can find the free edges and then get equivalance to solve my problem, but it only distorts my entire mesh. I would be very thankful for any kind of advice on how to solve this problem. wing_perf3edges.hm
  4. Tiago

    Transient data

    Hi guys, I have been performing an analysis in Acusolve and wanted to see an animation of the points but I cant click on the option Transient Data as the tutorial suggests. When I click build on the seeding panel, the points only appear one time in all the time steps and I cant visualize them moving. The global problem solution was defines as transient using SST and fixed mesh. Also I need to get the drag. How should I get the values to calculate drag or Lift after performing any Steady State or Transient analysis? Thanks in advance
  5. baozaizhang

    Question on open FSI in AcuSolve

    Dear All: I am trying to perform a CFD analysis for a building in wind with opening FSI. But I am afraid I didn’t see the building response (I thought the building should sway after I setting up the options related to FSI). Please see the following description. Thank you very much for your help. I defined four nodes at the top of the building for getting time-history responses. And the velocity of the lower-left point in x-direction and y-direction (two horizontal directions), they are 0 all the time. By opening the FSI, I did the following, would you please help me check if I missed something in the definition? 1. Go to the Eigenmode Manager, import the modal analysis results from OptiStruct. The animation is shown in the following screenshot 2. Change the wall boundary condition to “flexible body” and select “building” as the “Flexible body”
  6. Yatish Chandra

    AcuSolve memory problem

    Hello everyone, I am currently simulating an entire truck assembly in a wind tunnel environment using the AcuConsole pre processor and AcuSolve solver. I have around three porous mediums in my model along with 18 axial fans (Rotating reference frames) which has blown up the overall element size and also the complexity of the model. When I try to run the model setup in AcuSolve, after the domain has been decomposed, I get the following errors: acuRun: Run acuSolve ... acuRun: set KMP_AFFINITY=scatter acuRun: set MP_SET_NUMTHREADS=72 acuRun: set OMP_NUM_THREADS=72 acuRun: set OMP_DYNAMIC=FALSE acuRun: set MPC_GANG=OFF acuRun: "C:/Program Files/Altair/2017/acusolve/win64/bin/acuSolve".exe -np 1 -nt 72 acuSolve: AcuSolve checked out license from HyperWorks acuSolve: *** ASSERTION in Function <memAlloc> File <mem.c> Line <129> acuSolve: *** Unable to allocate <290044352> bytes; already allocated <73318612992>; from file <topSd.c> line <1451> acuRun: *** ERROR: error occurred executing acuSolve" acuRun: Wed Apr 4 16:07:48 2018 I have tried to change the mesh size and restart my computer but nothing seems to fix this issue. Could anyone provide more insight into this issue? I am also attaching the log file for reference. From what I can understand, it looks like a problem with my workstation not having sufficient memory to run the analysis. I am running it on a 36 Core (72 logical processors), 64 GB machine. Thanks, Yatish AssemFan.3.Log_acuTail.txt
  7. Mahantesh

    CFD Analysis of nozzle

    Hello Sir, I am working on CFD analysis of a particular nozzle.... In the case I am getting options to assign all the control cards, But Unable to find option to start analysis in the solver. Application: Engineering Solutions Section: CFD Solver tool : Acusolve Kindly Help me to get the solution Thanks and regards; Mahantesh
  8. Sinaabazariyan

    duplicate and mixed element types

    Hi! I want to export a heatsink mesh file into fluent. According to the below pictures, a volume of fluid passes through a heatsink using a suction fan located inside the elbow duct. The mesh was produced using automesh and solid map (line drag) for solid and fluid parts. Boundary conditions were defined as figs 1,2 and 3 shows. As figs 4 and 5 show, while I was exporting the final model to fluent, the error says that there is duplicate and mixed element types in my model. What can I do to fix this error and export my model successfully in the fluent? looking forward to receive your kind help
  9. ydigit

    AcuSolve Training Material

    AcuSolve Introduction Training webinar recording.
  10. Hi @all First, i hope this is the right forum for this topic. If it isn't, please switch. I've to simulate an multiphysics coupled heat transfer + fluid cooling process (like cooling fins or spines). For that case i've to define an heat flux into the base of the solid structure. The heat is flowing through the structure and left the structure on the "water" cooled contact surface. This cause an increase of the fluid temperatur deltaT (T_in-T_out) on the outflow against to teh inflow temperature. The fluid flow is perpendicular to the heat conduction in the solid. Points I've finished: Import complex geometry into ACUCONSOLE (+meshing) Define the global problem description Define the inflow, outflow, heat source (basic BC's) Simulation of the fluid flow through the structure still open Points: Simulation of the heat conduction Define the result of the Simulation (heat cond.) as boundary for the flow simulation As i wrote in the title, at the moment I work with the ACUCONSOLE. Is Hypermesh (with the ACUsolve deck) better for multiphysics like this? How can I define old results as boundary conditions in new simulations? (current temperature/heat flux as input value for the fluid wall) Is it possible to import more than one geometry into acuconsole? (The software always want to delete the previous part when i import a second one) I hope you can help me to solve this problem. best regards Alex
  11. Dear All, You can view the webinar recording of Nanofluidx, please click on the link below: Click here to View the webinar recording Regards, Kamlesh
  12. 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
  13. Daivd Kang

    Hypermesh about boundary layer

    Hi. There is a problem with my case. I created an outer circle with the diameter 0.0074mm and the inner circle is 0.007mm. Create a surface between the two circles in order to generate the boundary layer. The lines from the iges file were deleted after the meshing is OK. I want to create the boundary conditions such as inlet, outlet etc.. I use Tools-edges-find edges to create edges based on the mesh. However, 2 circles are still generated as edges. One can see the blue line and the red line. I don't want Hypermesh to find the red line. How can I do that? Thanks~~~~ 10rows-0.07mm-60deg-200elements.hm
  14. Dinesh_

    Uniformity Index

    Hi all, Kindly let us know how to calculate the flow uniformity through a given section/plane.
  15. 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 =
  16. 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
  17. Rajendra Prasad


    Hello, I am working on automobile component i.e. EGR coolar. Here task is to Cool hot gas emitting out from engine and to send back to engine by using coolar i.e. ethylene glycol. EGR coolar has two fluid gas(hot air) & coolant(Ethylene glycol). Each fluid passing from 1 side. It may be parrallel or counter flow. I am getting inputs from customer like this, I am showing you 2 case as follows: CASE 1: Coolant flowing at 90"C @ 1200l/hr @ 2.5Bar-gauge Exhaust Gas at 450"C @ 150Kg/hr @ 2Bar-gauge CASE 2: Coolant flowing at 90"C @ 1200l/hr @ 2.5Bar-absolute Exhaust Gas at 450"C @ 150Kg/hr @ 2Bar-absolute Hence some time I am getting input value of pressure in bar or absolute. I am giving BC like this: At inlet I am defining pressure and temperature and at outlet negative flow I am giving. But I am not understanding how to value of pressure in gauge and absolute? Regards Rajendra BorgWarner Emissions System
  18. Rajendra Prasad


    Hello, How to get gif animation in ACUFIELDVIEW I know how to form video in Acufieldview, but problem is video I am getting is in AVI. format. Then I am converting AVI. format to GIF and then preparing ppt. But while converting it, croping option is not there. Due to which ppt presentation is difficult. Is there, any another way where I get gif directly with crop option and with good clarity. Please help me. Regards Rajendra Borgwarner Emissions System
  19. Rajendra Prasad

    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
  20. Rajendra Prasad


    My CFD solve is running. I am working on EGR system(exhaust gas recirculation system). Its the thermal analysis. There are two fluid(air & coolant). Goal is to find outlet temperature of fluid i.e. air & coolant. My result is not converging. It's very big modal, nearly 40 million elements are formed. Each time step is taking nearly 30min. Now after nearly 96 hours, 160 time step is reached. Still its not converged. At TS 70, values looks more trendy. And at TS 120, solution was converged its best. But now at TS 160, results are not looking trendy. Now, I want result at TS 120. Is it possible, now solve is at TS 160? And, if any suggestions are there to coverge solve, then please suggest me.
  21. Shivam

    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.
  22. I have meshed a 2-dimensional conjugate heat transfer model in Hypermesh and need to solve it in Fluent. I am not able to get the wall boundary condition between a solid and fluid as a coupled interface. It states in the Hypermesh tips for fluent document that we need to make the wall from ^edges and then when you export it to fluent it should create shadow zone automatically but this isn't working for me. I have tried with simple meshing without 2d BL meshes. I have tried with only one solid body in the fluid air but still I am not successful in getting a coupled wall. I tried it with CFD tetra mesh for a simple body in 3d with ^faces collector and it converted to shadow zone in fluent. Its only a problem with 2d i guess. Kindly help me with this problem and if anybody has a tutorial with a 2d solid to fluid contact coupled wall please do let me know. I need it for my mini thesis and I am just stuck at this part.
  23. DanielAero

    Error - 2D mesh with BL

    Hi all, im doing the CFD-1300: Plane 2D Meshing with BL tutorial. But even following the tutorial this error appears (attached image) How can i solve that? Thanks
  24. jameshamilton

    CFD TetraMesh Issue

    Hi all, I am trying to create a simple CFD tetramesh in a pipe. When I try and run the Acusolve solution, I get the error "No Valid 3D element found in the neighbourhood of a trai element". The resulting error shows "Exterior Trias" and "External Quads" and show voids in the boundary layer mesh at random mesh locations. Can anyone help me with this issue? The Pipe inflows and outflows are set as W/O BL float and the Wall is set as With BL Fixed. Cheers, James
  25. Dinesh_

    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??