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problem in conjugate heat transfer

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Old   December 1, 2014, 05:39
Default problem in conjugate heat transfer
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hi everyone

i'm modeling the conjugate heat transfer. there are 3 solid zones and 1 fluid region .only one of the solid regions is in the contact with the fluid .

I have some questions :

1 - how much interfaces should i creat between the zones ? suppose that i want to create a interface between a solid and fluid . i should creat 2 interface 1 for solid and 1 for fluid and there will be appear 2 shadows besides in fluent ( 2 interface and 2 shadows) or just i should creat 1 interface for solids in contact region and 1 shadows will be appear in fluent ?

2 - should i creat a interface for the contact region of 2 solid parts ?

3 - if i split my solid geometry into 2 parts i must creat 2 interfaces or 1 interface with 2 faces for that geometry ?

4- there is a connection section in meshing part of ansys . shoud i creat a bonded contact between the contact regions or the interfaces are enough ?


(please excuse me for my poor english )
regards
reza
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Old   December 2, 2014, 00:31
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Quote:
Originally Posted by reza67 View Post
1 - how much interfaces should i creat between the zones ? suppose that i want to create a interface between a solid and fluid . i should creat 2 interface 1 for solid and 1 for fluid and there will be appear 2 shadows besides in fluent ( 2 interface and 2 shadows) or just i should creat 1 interface for solids in contact region and 1 shadows will be appear in fluent ?
You should only create 1 interface. The interface will also generate a shadow. You should have 1 interface + 1 shadow per joining region.

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Originally Posted by reza67 View Post
2 - should i create an interface for the contact region of 2 solid parts ?
Yes. Any two distinct regions must be connected through interfaces (this may be solid||solid, solid||fluid, or fluid||fluid), otherwise there is no interface / no communication between regions. Unless of course the regions are not meant to be connected and are mutually disjoint.

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Originally Posted by reza67 View Post
3 - if i split my solid geometry into 2 parts i must creat 2 interfaces or 1 interface with 2 faces for that geometry ?
1 interface. Remember the interface is the junction between the two regions, there is only 1 junction (even though it arises as a wall and shadow-wall pair).

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Originally Posted by reza67 View Post
4- there is a connection section in meshing part of ansys . shoud i creat a bonded contact between the contact regions or the interfaces are enough ?
Not sure what you mean by this. Are you trying to create an indirect interface? That is an interface between mesh regions that are not spatially connected? Because that is possible.
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Old   December 2, 2014, 04:16
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thank you very much LuckyTran


how can i creat an interface ? should i creat a named selection for the faces which 2 zones are connected called interface and select the inteface boundry condition in fluent or i must select a wall boundry condition for that and select coupling in thermal condition ?

for the forth question i mean this :





should i creat a contact between 2 regions here ?


another question is how can 2 regions's mesh connected to eachother ?

thanks again
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