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Rahul Ponginan

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Everything posted by Rahul Ponginan

  1. This Topic is to discuss following questions: What Hardware is best suited for Hypermesh / Radioss work frame in order to produce fast results. Following questions specify this question: a) What Processors should one use best. Which Socket is more efficient Some thing on Motherboards c) RAM: More is better, but which frequencies are supported for the solvers: 1600mhz and above interesting? d) Graphic Cards. As it sais somewhere, the more consumer related Cards like GTX Series from Geforce are not fully supported in Hypermesh. Is this an issue? e) Cooling Aspects: Does Water Cooling affect solving time? Over-clocking useful? This all points somehow to the discussion: Build your own Workstation Computer for FEM - Analysis or is the consumer Computer suited enough for the task? As a reference consumer Pc, the following data can serve: Motherboard: Asus Republic of Gamers FORMULA V Processor: i5-3750k; 3,4Ghz; Air Cooled; Socket: 1155 Ram: Corsaier 4x4Gb 1600Mhz Hyperworks on SSD Drive The aim of this post is to give a guideline on how to optimize the hardware aspects of the system doing the FEM-Analysis, now and as a glance into the future: for further versions of Hyperworks with even more multi core support; better memory usage etc. Thanks for all, who contribute to this. Best Regards, Manuel
  2. Nahid3007 When we say surfaces we always mean geometry and not elements, there are two ways to apply loads on surfaces (geometry) or elements. From your second image, it looks like you have applied the loads on the surfaces (geometric entities) and not on elements, In which case you should go to Analysis > load on geom > select your load collectors > map loads Then the loads will be automatically applied to the elements based on the magnitude of the load you applied on the surface (geometry)
  3. Osman, I see that you can use the RWALL card, see - Altair OptiStruct > Reference Guide > Input Data > Bulk Data Section > RWALL This can be created from Analysis > rigid wall within HyperMesh. See - HyperWorks Desktop Applications > HyperMesh > User's Guide > HyperMesh Panels > HyperMesh Panels Listed Alphabetically: Rigid Walls Panel
  4. Javier, I suggest you start with inspire in that case,
  5. Javier, you will need to register to the client center to have access for some material, please do so. you can also set up this model for optistruct, go to the topology section of http://training.altairuniversity.com/ your model looks simple, you can actually follow the videos in topology optimization basic here
  6. jeunehomme30, Your tetra elements need a psolid property assigned to them, they currently do not have any property assigned to them, hence the error. You can watch these set of videos to understand quickly how to do a linear static analysis in HyperWorks http://training.alta...lysis/analysis/
  7. jeunehomme30, Your tetra elements need a psolid property assigned to them, they currently do not have any property assigned to them, hence the error. You can watch these set of videos to understand quickly how to do a linear static analysis in HyperWorks http://training.altairuniversity.com/analysis/structural/linear-static-analysis/analysis/
  8. Osman, Which solver do you need to create the cylindrical rigid wall for? See step 8 here to do this for RADIOSS Altair RADIOSS > RADIOSS Tutorials and Examples > Tutorials > Large Displacement Finite Element Analysis > HyperMesh: RD-3550: Simplified Car Pole Impact
  9. Martin, Can you also provide the run folders? this is a folder called solid thinking in the inspire working directory.
  10. Javier, Please go to Hyperworks.com and to the resource library, once there choose interactive tutorials http://www.altairhyperworks.com/ResourceLibrary.aspx Yes you can convert from ansys to optistruct, go to tools > convert > ansys to optistruct You can also learn topology optimization using the tutorials in the resource library and help and set the model up yourself,
  11. diegoz, Are you using solid elements? A solid element has only 3 translational and no rotational dofs hence solids do not support moments applied to nodes. In FEA we then need to work around the above fact. So we create a rigid element connected to the face of the model where the moment needs to be with all its dependent nodes on the solid face and a calculated independent node. (HyperMesh calculates the independent node by itself) We then apply the same moment on the independent node.
  12. pka 1991, Please see a tip and trick document called A checklist for reviewing a tria mesh before tetra meshing it and tips for tetra meshing. here - http://www.altairhyperworks.com/tip_hm.aspx since your geometry is really complicated, looks like a bone from STL, I suggest you use Shrinkwrap, see HyperWorks Desktop Applications > HyperMesh > User's Guide > Meshing > Surface Meshing > Shrink Wrap Meshing in help, When you need to convert an .stl representation of a model into a tria/quad mesh; shrink wrap provides a quick and efficient way of achieving this.
  13. Mike, Are you following CFD-1400: Wind Tunnel Mesh ? What is the message you see when you try to tetramesh the volume in the bottom left, i.e. in the status bar when the meshing operation fails ?
  14. mitch297, You must first create the necessary response, in this case it is the Single Point Force at a constrained grid point This response can be defined using the DRESP1 bulk data entry (with RTYPE=SPCFORCE).
  15. Moumita, I also agree with the above and also your pictures are not visible, If you work for a company that allows using 10.1 only, please contact local technical support as well, http://www.altairhyperworks.com/ClientCenterHWSupportProduct.aspx You can try a reinstall and also perhaps change the working directory (the place where you find the .tcl and .cmf etc) by right click on HM icon > change the path in "start in" > apply. Perhaps you also need to update your graphics card driver, make sure you are not using one of the unsupported cards such as Intel.
  16. Hi Martin, Thank you for sending the files, we are investigating the issue and will respond soon.
  17. ukyokatajama This is Rahul from Altair, Please send me the stmod file and we will investigate this issue, The model may not have been saved properly, If your file is confidential, just use the secure dropbox below and we will keep your model file confidential, Secure file dropbox https://ftam1.altair.com/dropbox/~0simQA
  18. petarf, Please tell us the name of the abaqus keywords you need to use and we can help you create them in HyperMesh.
  19. Hi All, You should really read the free HW ebook on optimization called Practical Aspects of Structural Optimization - http://www.altairuni...m/free-ebooks/� The compliance is the strain energy of the structure and can be considered a reciprocal measure for the stiffness of the structure. so minimizing compliance will maximize stiffness, we would not maximize compliance therefore. the upper bound and the lower bound for constraints describe the range of the constraint value, so when you say upper bound 0.8 you are telling the solver that the constraint may not get higher than this value, when it does for a particular design variable the solver will stop and change the design variable. Please read the definitions of these responses here Altair OptiStruct > User's Guide > Design Optimization > Responses: Internal Responses
  20. Formulation for volume fraction: Volume fraction = (total volume at current iteration – initial non-design volume)/initial design volume we many times use 0.3 to start with , which means 30% of the "design space" volume will be retained. In OS help , see - Altair OptiStruct > User's Guide > Design Optimization > Responses: Internal Responses
  21. pka1991, We have several hex meshing videos in the training center that may help you - http://training.altairuniversity.com/ and also in the resource library in hyperworks.com Have you tried shrinkwrap, Shrink wrap meshing is a method to create a simplified mesh of a complex model when high-precision models are not necessary, as is the case for powertrain components during crash analysis. The model's size, mass, and general shape remains, but the surface features and details are simplified, which can result in faster analysis computation. You can determine the level of detail retained by determining the mesh size to use, among other options. see HyperWorks Desktop Applications > HyperMesh > User's Guide > Meshing > Surface Meshing: Shrink Wrap Meshing
  22. Praveen, I suggest you read the free ebook Practical Aspects of Structural Optimization - http://www.altairuniversity.com/free-ebooks/ also see - Altair OptiStruct > User's Guide > Design Optimization > Topology Optimization: Design Variables for Topology Optimization
  23. Prithvi, Just go to pre processing > geometry > midsurfacing in the Training center - http://training.altairuniversity.com/ http://training.altairuniversity.com/modeling/geometry-2/midsurface-pdf/midsurfacing-intro/
  24. BeMa86, About the error, please make sure all your elements have a property assigned to them, it is very rare that this error comes up for just one element, although it refers one element at a time in the error several elements may have a property missing, a quick way to check is to change the visualisation mode to by prop and if there are grey elements, these elements do not have a property assigned to them.
  25. Yes, but please note CNTNLSUB is for non linear loadcases only,
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