Confused! HOW to convert RADIOS model to NASTRAN?

Sebastian Yang
Sebastian Yang Altair Community Member
edited May 2 in Community Q&A

Hi

 

I have a RADIOSS model where I have the mesh, material, properties, contacts and boundary conditions defined for a simple crash test! 

Now I would like to export/convert the model to perform an analysis in NASTRAN.

I have tried to change the User Profile and export the bdf file! But when I try to run it it says that no PARAM was detected

image

I guess it´s because in NASTRAN you have to select an analysis type and other stuff. But in RADIOSS we kind of don´t do that? 

 

Thank you!

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Best Answer

  • Polyvios Romanidis
    Polyvios Romanidis New Altair Community Member
    edited April 30 Answer ✓

    Hi Sebastian,

    Unfortunately I can not help you directly with that because I do not have a lot of experience with NASTRAN.  What I know is that NASTRAN has a similar approach with OptiStruct for model set-up, so you can try to convert your model to OptiStruct via HyperMesh and see what you have to define for the NASTRAN model you need.  To do that, you have to go to File/Convert/OptiStruct and a list with all recommended conversions will appear.

    Polyvios

Answers

  • Naresh
    Naresh Altair Community Member
    edited April 18

    I never tried to convert to Nastran, but my understanding is, Hypermesh can convert element type, material, thickness and boundary conditions from Radioss to nastran or opti. But solution type and output request is unique for the solver and we need to define them based in type of loadcase and required output.

     

  • Sebastian Yang
    Sebastian Yang Altair Community Member
    edited April 18
    Naresh Kini said:

    I never tried to convert to Nastran, but my understanding is, Hypermesh can convert element type, material, thickness and boundary conditions from Radioss to nastran or opti. But solution type and output request is unique for the solver and we need to define them based in type of loadcase and required output.

     

    Hi Naresh,

     

    Yes, I thought the same, in Hypermesh I can define the solver and the output request for Nastran, so probably that what I should do before exporting to bdf.

     

    Thanks.

  • Polyvios Romanidis
    Polyvios Romanidis New Altair Community Member
    edited April 30 Answer ✓

    Hi Sebastian,

    Unfortunately I can not help you directly with that because I do not have a lot of experience with NASTRAN.  What I know is that NASTRAN has a similar approach with OptiStruct for model set-up, so you can try to convert your model to OptiStruct via HyperMesh and see what you have to define for the NASTRAN model you need.  To do that, you have to go to File/Convert/OptiStruct and a list with all recommended conversions will appear.

    Polyvios

  • Sebastian Yang
    Sebastian Yang Altair Community Member
    edited April 30
    Polyvios Romanidis said:

    Hi Sebastian,

    Unfortunately I can not help you directly with that because I do not have a lot of experience with NASTRAN.  What I know is that NASTRAN has a similar approach with OptiStruct for model set-up, so you can try to convert your model to OptiStruct via HyperMesh and see what you have to define for the NASTRAN model you need.  To do that, you have to go to File/Convert/OptiStruct and a list with all recommended conversions will appear.

    Polyvios

    Hi Polyvios,

    Glad to see you! We basically found out that too, I am referring to what you mentioned about converting to optistruct before exporting to Nastran, Naresh's answer helped as well. We believe it is the right path because you can set up solver output and solver configuration with Nastran user profile and then just export the bdf file. Thank you! 

  • Michael Herve_21439
    Michael Herve_21439
    Altair Employee
    edited May 2

    Hello @Sebastian Yang ,

     

    Radioss is an explicit profile and Nastran is an implicit one. As a consequence, it may not be straight forward to convert a model from explicit (where you have some transient cases) to implicit, or vice versa.

     

    Below is an article detailing some features available to convert models in HyperMesh:

    https://community.altair.com/community/en/about-solver-conversion-in-hypermesh?id=kb_article&sysparm_article=KB0122965

     

    Hope that helps,

    Michael

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