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Combined thermal - static analyses (trouble to get solution)

Creator
Creator

Hi evryone,

 

I'have a combined thermal - static analyses that i need to solve using Nx Nastran 10.0. It's a simple beam, fixed in one side, and have a masse charge in the other side that is exposed to T=500°. and i'm studing thermal conduction and the deflextion of the beam (influenced by the the charge and probably the temperture).

So the problem is that, when i try Nx static simulation, i could not insert a temperture. and when i try in multiphysyque analyses i get two seprate solutions for static and thermal knowing that i'dont get nothing in the thermal solution.

 

Thank you in advance for your help

 

4 REPLIES 4

Re: Combined thermal - static analyses (trouble to get solution)

Siemens Phenom Siemens Phenom
Siemens Phenom

There are many options to do this, depending on what type of thermal loads you want to apply, what types of meshes you have (same mesh for both or different thermal and structural meshes) what type of thermal solution (steady state or transient) and what type of coupling you want between thermal and structural solutions (one way, sequential or iterative).

 

It sounds like you just want to apply a 500° temperature load to one end of the beam, solve for the steady state temperature distribution, then solve for the thermal strains induced by this temperature distribution. The simplest workflow for this is to solve a SOL 153 steady state thermal run. Temperature results can be written to a punch (.pch) file to be included as a load in a subsequent structural analysis. This can al be done in a single SOL 101 solution if you set up 2 subcases (thermal first, then structural) and include PARAM, HEATSTAT

 

https://docs.plm.automation.siemens.com/tdoc/nxnastran/12/help#uid:index_QRG:id512286:id511316:id511...

Re: Combined thermal - static analyses (trouble to get solution)

Creator
Creator

Thank you very much for your answer, actually the study is about the Stud behavior that is exposed to a steady temperture T=500° inside the furnase and in the mean time have to support the charge P.

So i did a steady state thermal run SOL 153 but i don't know how to export results into punch file and probably i will not know how to includ it as a load in a subsequent structural analysis ? sorry, but i m new Nx user so can you give me more détails about plz


stt ther.jpg 

Re: Combined thermal - static analyses (trouble to get solution)

Siemens Phenom Siemens Phenom
Siemens Phenom

Specify the PUNCH describer on the THERMAL output request in case control, i.e. THERMAL(PLOT,PUNCH)=ALL

 

This will generate a .pch file containing a TEMP card for each grid that has the result temperature assigned to that grid.

 

This file can be INCLUDEd in a subsequent SOL 101 analysis. You will need to add an appropriate TEMP(LOAD) = SID to your case control to reference the SID of the TEMP cards in the punch file.

Re: Combined thermal - static analyses (trouble to get solution)

Creator
Creator

Thank you very much for your help and your quick response, i tried to solve it as you said, but i'm still getting a lot of fatal erreurs. you can find the attached file .f06

That being said i couldn't find the case control how to refere the SID

1.PNGCapture.PNG
4.PNG5.PNG
44.PNG

what do you think the probleme is?

Here is my thermal solution

aaa.PNG

and here is my static solution

bbbbb.PNG

Thank you

 

https://www.dropbox.com/s/7goe6w7nupcpel5/model1_sim1-solution_2.f06?dl=0

 

https://www.dropbox.com/s/ec5reu6rirmoowb/model1_sim1-solution_1.f06?dl=0

 

https://www.dropbox.com/s/s6b6rcajtidvlz3/model1_sim1-solution_1.dat?dl=0