Assign different heat transfer coefficient

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

Hello everyone

 

As there is convection, I use MAT4, which also contains the heat transfer coefficient H. Now I am woundering, how can you specify two different heat transfer coefficient on certain surfaces of the model? 

The heat transfer coefficient is actuallly not a material property, so I am woundering if this is the right way to go. How can two different heat transfer coefficient be assigned?

 

Thank you in advance for your help!

Answers

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

    The Heat transfer coefficient can be defined in PCONV (Free Convection Property Definition).

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  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Thank you Rahul! 

     

    Does this interface come from the group 'CONVECTION'? Because the default there is FTYPE 0, with which I can assign MID, but no H1. If I change FTYPE to 3 I can assign a H1, but no MID. 

     

    Do you know why I can't assign both?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Okay I can assign MID and H1. But there is still a problem. The temperatures are not including any convection. 

    Can I still use MAT4 and specify there the thermal conductivity (K) and leave the heat transfer coefficient (H) empty?

     

     

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

    yes you can try with above settings. If still face issue then please share fem file to check same at our end.