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tH3f0rC3 May 3, 2012 07:08

Heat Transfer
 
Hi there,

I have studied the turorials heatedfin and dualstreamHE already. But I still don't know how to set up the interface between a solid and a fluid region. The simulation should calculate the heat transfer coefficients from the simulated velocity and temperature values.

I have created the Interfaces already. In the directory "Boundaries" I can choose a Thermal Specification (Interface-Boundary -> Physical Conditions). I'm not sure which method to choose.

Description of my case:
- I have 3 physics continua. 2 Fluids and 1 Solid which is located between the Fluids. I want to set up the case with the inlet temperature and velocity values. The temperature field, local heat transfer values, outlet temperature and velocity values should be calculated.
-> I'm not sure which method to choose:
- adiabatic and heat flux doesn't make sense.
- the method convection asks for heat transfer coefficients, thus it also doesn't make sense to choose this method.
-> The only method left is "temperature". But here I must specify a static temperature.

What is this static temperature? I havn't found a satisfying explanation in the User Guide.

Maybe someone can help me.

Best Regards,
tH3f0rC3

madhuvc May 3, 2012 09:55

http://www.cfd-online.com/Forums/sta...ation-cht.html

Abdul has given a detailed explanation in that post...

tH3f0rC3 May 3, 2012 10:11

Thank you for your reply.

But I already know that you can either model several bodies with Interfaces between them or one body with boundary conditions (temperature, heat flux,...).

I'm not sure how to set up the case with several bodies. The tutorial heated_fin uses the method "temperature" as thermal specification on the interfaces. But I don't know what is meant with "static temperature"!
Is it the temperature on the interface?

The other methods (heat flux, adiabatic and convection) are not useful for my case.

Best regards,
tH3f0rC3

rwryne May 3, 2012 11:26

Quote:

Originally Posted by tH3f0rC3 (Post 359107)
Thank you for your reply.

But I already know that you can either model several bodies with Interfaces between them or one body with boundary conditions (temperature, heat flux,...).

I'm not sure how to set up the case with several bodies. The tutorial heated_fin uses the method "temperature" as thermal specification on the interfaces. But I don't know what is meant with "static temperature"!
Is it the temperature on the interface?

The other methods (heat flux, adiabatic and convection) are not useful for my case.

Best regards,
tH3f0rC3

If you are doing CHT between two bodies (I know this is redundant to say as CHT requires two bodies), you do not set a boundary condition for your interface. The option is there, but do not use it.

The boundary conditions are for surfaces that do not have an interface.

tH3f0rC3 May 3, 2012 12:11

Thanks for your answer.

I know and I don't want to set a boundary condition.
But what shall I do with the Thermal Specification (Interface-Boundary -> Physical Conditions) in the directory "Boundaries"? Obviously it is necessary to choose any method.
This is the problem I have.

Best Regards,
tH3f0rC3

rwryne May 3, 2012 12:42

Quote:

Originally Posted by tH3f0rC3 (Post 359140)
Thanks for your answer.

I know and I don't want to set a boundary condition.
But what shall I do with the Thermal Specification (Interface-Boundary -> Physical Conditions) in the directory "Boundaries"? Obviously it is necessary to choose any method.
This is the problem I have.

Best Regards,
tH3f0rC3

This is what I was alluding to. It is confusing, but you leave it as adiabiatic. The interface overrides the boundary, so the boundary condition ("physics condition") is not used. If there is an interface present, heat will be transferred through it.

tH3f0rC3 May 3, 2012 13:09

Ah, now it is clear!
Thank you!:)


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