Jump to content


  • Content Count

  • Joined

  • Last visited

Everything posted by SKGPrashanth

  1. Is there a command to get indepedent/master node details (id) of a selected RBE2/RBE3 element?
  2. I still don't know how to do this directly, but after rolling my head for a really long time, I've adopted a work around. I've exported each fluid domain (along with face elements under appropriate collectors) as a separate .cas file. If I place the interface elements under a collector named 'Interface', hypermesh automatically neglects those elements and other wall elements get free 1d's at the ends. So I had to fool Hypermesh by placing the interface elements under component named 'Wall' and then export the .cas file. These separate '.cas' files (one for each domain) can now be loaded into fluent by Zone->Append Mesh and change the boundary conditions of the interface elements from 'Wall' to 'Interface'. I can't understand why such a simple task as exporting 'Multiple Domains' as a single case file is this tough.
  3. "hm_entitylist elem id" shows the list of all elements there is. I want a id list of a collection of elements which I can place in a set or table or mark.
  4. When trying to export mesh to cas, an error "*Component names* are assumed to have interface elements and are not included" pops up. I need interface elements (overlapping face elements that are not connected) in my cas file for solving in fluent. How do I export mesh with interface elements.
  5. If it's of help to anyone, Dofs 1, 2, and 3 are radial, tangential and translation degrees of freedom. Dofs 4, 5, and 6 are radial, tangential and translation rotational degrees of freedom. source:http://blog.altair.co.kr/wp-content/uploads/2013/07/RD-1070_-Analysis-of-an-Axi-symmetric-Structure-using-RADIOSS.pdf
  6. Thanks. Keeping options as 'both' solved the problem. I'll let you know in case of difficulties in the future.
  7. These are the last lines in the out file. Which part of the out file are you interested in?
  8. Sorry, my bad. I misread engine file as rad file. Here's the engine file.
  9. Running the rad file directly from Radioss too doesn't give any animation output.
  10. Please excuse me. I don't have permissions to share the file. I hope this is OK. The same RAD file is running without problems and generating A files without any problems in another system. This problem has been more of an on again off again type. It occurs sometimes and solves without any problems some other time.
  11. Radioss explicit analysis process completed successfully, 0 errors, 0 warnings but animation file not generating. Some window of HV Trans is opening and nothing can be done except closing it.
  12. @George P Johnson, Typing it manually in the unsupported cards tab of engine file had no effect. Does this mean that v10.0 doesn't support showing BFRAC as contour?
  13. @George P Johnson, Is it possible that the option that you said is a newer one. Because, we use HyperWorks 10.0 and we couldn't find the option BFRAC for BRICK3D. The options start at D. There's no option that starts with B.(Alphabetical order) Can we do anything with USRi?
  14. In explosive analysis, I was able to see Burn Fraction time history plot by using variable 'BFRAC' under Output Block. How to see animation contours of such variables? What options should I change in the engine file to achieve this?
  15. @Rahul R I'm afraid, you didn't understand my question. I created a multi-page session file that's meticulously planned for a particular assembly's results with each component. Now, there is a small change in the loading conditions, and I've re run it with updated loads. I don't want to create a session file again. It'll be easier to just point the updated h3d file in the session, if that's possible since the views and components didn't change, only the force values have changed. How can I go about achieving this?
  16. How do I change the h3d file to load in my session file? How to point to some other h3d file than the one that's loading by default?
  17. Thank You, @Rahul R and @Prakash Pagadala for your efforts. Based on your answer, I doubled the stress amplitude value and then substituted the resulting stress range in the formula Sr = SRI1(Nf)b . When I used this new SRI1 value(It is double the old value), I'm getting the results as expected. One last question. Does the formula Srange = 2×Samplitude hold good even for load curves that are not sinusoidal?
  18. In the meanwhile, I tried the exact same problem in Ansys Workbench; where I got exactly the same result as that from the formula. What am I missing out in Radioss?
  19. The maximum and minimum loads are 2000 N and -2000 N respectively. (defined by sine curve) Stress amplitude is 198 Mpa Mean Stress is 0 MPa (Because of fully reversed loading)
  20. file.h3d file.hm file.fem Fatigue Calculation.docx
  21. I came across in the documentation that the life is calculated using the formula. Sr = SRI1(Nf)b But, even after maintaining the co-efficients, TRTMENT, FINISH and [KF] as 1, the results are off (when compared with the manual calculation using the above mentioned formula) by a random factor (approximately 0.5), for each unique component I take for fatigue analysis (Refer image attached). Why is it so? What is the calculation happening at the back end of the software? Why is the factor 0.5 coming into play?
  22. A propeller shaft experiences opposing torques on its ends, while rotating. What types of analyses are generally carried out on a propeller shaft, apart from static, modal, fatigue? What are the reversing loads to be given in a fatigue analysis? (The only reversing force that comes to my mind is the shaft's self weight, acting sinusoidally. Are there any other reversing loads in a rotating shaft?)
  23. @Rahul R, I think it's for CFD. https://meshing.lanl.gov/proj/ASCEM_Tank/images/gallery.html Is this type of hanging node OK for CFD?
  24. I came across this mesh image in the internet. Can anyone explain how this is a valid mesh? Won't this result in connectivity issues in the mesh due to hanging nodes?
  • Create New...