heat transfer issue

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Dear Colleagues,

 

I have a problem with heat transfer analysis. I am experienced with ANSYS thermal analyses and at the same time I am working with HyperWorks for a couple of years but it is my first more complex thermal problem that I am solving with HW.

 

My problem is, I don’t know how to set properly the analysis Load collectors and steps.

 

What I want to do:

I have a part of a machine (rotating lathe table) which is heated by heat generated in bearings and motor. According to the norms I have performed on machine test and I need to reply this with FEA to obtain a model on which I can test construction changes.

The machine has been working in a few timesteps, with different parameters. My question is how to set the Loadsteps to obtain a few substeps which are performed one after the other under the terms of the previous. 

 

Bellow I posted a shorten table of the experiment. The heat flux has been calculated analytically.

 

Time [min.]     heat flux [W/mm2]

0 – 30              hf1

30 – 60            hf2

60 – 120          hf3

...

 

After that I want to obtain the temperature distribution on the table and its deformation (displacements).

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Hi,

     

    You can run a non linear transient heat transfer analysis. Please refer to this example OS-E: 0610 Manifold: Nonlinear Transient Heat Transfer on OptiStruct help.

     

    I have attached a pdf with what are the inputs required for the same. 

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Thank you for your help. Sorry for long reply but this case was one of the problems that I was solving last time.

     

    Anyway I have one more question related to this issue. 

    I need to perform optimisation (parametric/ size) on this model but OptiStruct shows the message that it is not possible to perform optimisation with transient load case. Is there any possibility to perform optimisation with load case described in my first post? I m going to minimise the total deformation of the turn table which is caused by the heat (transient load case).

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited October 2018

    Currently this analysis type is not supported for optimization using OptiStruct but could try this in Altair HyperStudy.