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mvass

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mvass last won the day on October 24 2016

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About mvass

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  1. Answer: The use of "R-trias" elements of the right size does the trick...
  2. Hello all, I would like your expert opinion about the surface mesh I am trying to perform on the curved areas of a simple wing (leading edge). Since I would like to export the mesh for a CFD analysis, I am trying to mesh the surfaces with "trias" elements. However I am not happy with the mesh on the leading edges which exhibit a high curvature. I know the result will be better with "quad" elements, however as I mentioned before I would like "tria" elements on my surfaces. The "surface deviation" option meshed the surface (as per attached example) but with too many elements. Can you please have a look on the attached model (note: HM version 10)? Thank you in advance for your assistance. surface_deviation.bmp elevator.hm
  3. Thank you very much for your kind reply and the files provided.
  4. Hello all and please accept my apologies if my question has been answered in the past. I am interested in simlab's capabilities especially for our design team, so I would like to ask if simlab comes together with Optistruct as a solver, or it has to be purchased as well. I haven't seen any videos about simlab explaining how to setup simlab to start optistruct by default, solve the problem and then view the results within Simlab environment. Thank you.
  5. Thank you for your reply. In my study, I am not looking for post buckling and my solution scheme does not include a velocity BC like the example shown. Besides the obvious constraints, the load is exerted on the model via an enforced displacement. In addition, I am not looking on a transient NL analysis. But I guess it wouldn't hurt if I'll try to solve the problem with NLPARM and TSTEP card, provided that it is possible. Should I get something worth to write about, I'll post it here.
  6. Hi, any views on my updates about the problem? Thank you in advance
  7. Second update: I managed to solve the afore-mentioned problem, by specifying a value of 1.0 (instead of the default 1.1) to the DTSCI entry of the NLPARMX card (see the attached picture). However the question still remains: Why the solution is different when the default values are used? How come there is no warning/error in the previous situation? nlparmx.bmp
  8. OK, here is my update to the problem. Unfortunately I cannot share the model with you, however, please find attached the .out file and the solution scheme from the .fem (input file). As mentioned before, the solution converges normally but the results are not correct. It is a NL buckling problem (compression of a panel) and I am supposed to have a max displacement (magnitude) on the panel of 20mm. This doesn't happen and the max. displ. magnitude I get is 10mm. My solution was a NL geometric (impl) that I set up in Optistruct and automatically translated to Radioss (version 2017.2). I tried to run the problem as quasi-static NL with large displacement activated in optistruct but it didn't converge. Thank you in advance for your assistance. CCCC_v2_rad_s1_0001.out problem_fem_extraction.txt
  9. I agree with you. That's why I was surprised to see different results when NINC was 50. Maybe I couldn't see where the mistake was, however there was no error shown in both runs (NINC=50, NINC=25). Thanks for the advice about the param option.
  10. Thanks for your reply and sorry for my late feedback. I cannot remember what I did with the latest version, however I'll give it a go with NLSTAT and large displacement option and contact you again. However I still cannot understand why when you specify that you want a NL analysis with fixed number of increments (constant DT), the problem converges with less increments completed (and the result doesn't capture the phenomenon as it should).
  11. OK, here is an update, after solving my .fem file on two different versions (thanks to my friends): HW version 13.0 completes the solution in 50 increments as requested, and the analysis is complete and correct. HW version 2017.2 (student version) completes the (same) solution in 25 increments the analysis says that it is completed but the results are not comparable to the previous ones. Any ideas why this happens?
  12. Hello. I am working on the NL buckling of a composite panel (geometric NL implicit) and I successfully setup the model and ran the analysis within radioss after automatic conversion from the optistruct input. The problem is that although I specify I need 50 increments (NINC) with PW convergence criteria, the solution ALWAYS converges at 25 increments and of course the total buckling is not captured. Below is my NLPARM card from the .fem file. I am not specifying anything else in the NLPARM card or in any other cards. Can you please help? NLPARM 6 50 0.0 6 50 PW + 0.01 0.01 20 + 1.0 Thank you
  13. Thank you tinh, can you please explain how to do this? So far the only methodology I've found is in this thread: https://forum.altair.com/topic/13431-faq-47%09what-to-do-when-you-get-elements-not-defined-in-template-error/?tab=comments#comment-25651 If the above has been updated in a newer version of HM (i.e. made more user friendly) I'll be happy to know.
  14. I had exactly the same question... How is it possible to add new element types for NASTRAN profile. Do you mean you can do this with a new version? Can you please show? If it can be done I want to include it to a proposal I am writing. In addition: Is there a script (or other method) to create new property cards and thus assign newly created element types to a specific property that is currently not included? Thank you in advance.
  15. I've found the answer myself: Refer to help: Create/Edit Laminate Dialog Select Import from Excel (as seen in the above picture), then select .csv file. Select your file (must be comma separated) and open. I have attached an example .csv file (Hypermesh format) for your convenience. import.csv
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