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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 40 results

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. Uniformity Index

    Hi all, Kindly let us know how to calculate the flow uniformity through a given section/plane.
  7. 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
  8. 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 =
  9. 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

    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

    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
  12. 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
  13. 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.
  14. 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.

    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.
  16. 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
  17. HM CFD Overview

    Hi All, Please go thorough the complete video recordings of new features introduced in HyperMesh (HM) Engineering solutions for CFD. Click here to view the HM Engineering Solutions CFD New Features Regards, Kamlesh
  18. 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??
  19. Hello, I am trying to use TCL code to automate the tetrameshing process due to a large number of individual components needed to be meshed for CFD. I am using a simple right angled pipe and have a variation of code that was given in the "Hyperworks Desktop Reference Guide". I can successfully use the tetramesh process within Hypermesh itself manually, selecting my "Wall" as With BL (Fixed) and my "Inflow" and "Outflow" as W/o BL (Float) and do not have the issues that I will explain. However, when I try and automate the process using TCL code, my "^CFD_trias_for_tetramesh" part is only a 2D mesh. This then results in the following failure when using the AcuSolve job launcher: "No Valid 3D element found in the neighbourhood of a tria element". Whereas, if I was to do this manually, the part would be called "CFD_tetcore001", however it would be a 3D volume mesh. Here is my code: *createstringarray 2 "tet: 21532 1.2 2 0 0.8 0 0" "cfd: 86 0.0035 22 1.2 1" *createmark comps 2 "Inflow" "Outflow" *createmark comps 1 "Wall" *tetmesh comps 2 0 comps 1 3 1 2 Would anyone be able to provide any suggestions as to how to get a 3D mesh in the centre of the fluid. Thanks, James
  20. Click here to view the HyperWorks CFD AcuSolve 2017 webinar recording
  21. AcuSolve Training Material

    AcuSolve Introduction Training webinar recording.
  22. problem

    What is assertion in function ? I have attached an image. What does that mean ?