How to apply Temperature load to a pipe carrying cryogenic liquid?

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

I have to model a pipe using shell elements full of LOX (Liquid oxygen) which is at 20K surrounded by ambient temp of 293K. Please help me how to best solve this..

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Answers

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited December 2018

    Hi Arjen

     

    This tutorial deals with similar condition as you have. please check whether this helps.

     

    https://altairuniversity.com/learning-library/tutorial-thermal-analysis-heat-transfer/

     

    Thanks

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2018

    Hi Pranav,

    In the tutorial, is the engine block made of solid elements or shell elements? I see in the .hm file that the property assigned to the elements are thru PSHELL card, but the entire engine block looks like it has been meshed with solid elements,

     

    Can we assign PSHELL card to solid elements? And how to create interface for shell elements?

     

    Thanks

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited December 2018

    Hi Arjen

     

    Since you are considering the heat convection across the wall of the pipe, you have to model it with solid elements with solid property.

    Have a look at this tutorial too from OptiStruct help. 

    This is much more similar to your case.

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.a23dd328217fbb54fd006db15dbfc2e6.png

     

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2018

    Hi Pranav,

     

    I had referred to the tutorial OS-T: 1085 before, but the problem is I have to use shell elements, not solid elems to model the pipe (thickness 2mm). Also, Can you please explain how In the engine block .hm file you sent before, solid elements are assigned PSHELL properties? Is this the solution for my case? 

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited December 2018

    Hi Arjen 

     

    Its recommended to use solid element for the conditions you want. However i will check and tell you if any alternatives there.

    I checked the file. Its just named as Pshell, but the property assigned for solid elements are Psolid only.

     

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.f554ce9794c3dd5e463955555a42c699.png

     

     

    Thanks

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2018

    Hi Pranav,

     

    I had not noticed the PSOLID card entry, thank you for clearing it up. Is it possible to use TREF in the MAT1 card to give an initial ambient temperature to the pipe material(Steel) and then give temperature load of 20K using TEMPD?

     

    Thank you

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

    Could you please share .fem file which you are running at your end?

     

    You can request free eBook on OptiStruct Thermal Analysis using below link.

    https://altairuniversity.com/free-ebook-thermal-analysis-with-optistruct/

     

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