Impose a boundary condition on an interface between a solid and a fluid

ajdad · February 10, 2015, 12:37

I seek to impose a boundary condition on an interface between a solid and a fluid ???

plzzz help me

CeesH · February 11, 2015, 03:09

I Guess a solid-fluid interface would simply be a wall? What is the problem with applying a boundary condition there?

Or are you using a solid zone and fluid zone? If so - why; why not just leave out the solid part, and make the interfaces walls?

ajdad · February 11, 2015, 11:34

thank you CeesH for your reply, I explain my problem:
I want to simulate a solar receiver. we have two coaxial tubes.
the inner tube of length = 3m, it is made of steel it has a thickness = 3mm and receives a solar flux = 8000 W.
the outer tube is made of glass.

==> Be simulated, the convective thermal exchanges between the internal tube and the area of the cavity ???
When I use ansys fluent, I find the problem of creating a shadow face of the outer face of the inner tube, which I must impose a condition (flux = 8000W) !!!

Is what I will impose the boundary condition on the outer surface of the tube or on shadow face ???

February 10, 2015, 12:37	Impose a boundary condition on an interface between a solid and a fluid	#1
ajdad New Member ajdad Join Date: Feb 2015 Posts: 5 Rep Power: 11	I seek to impose a boundary condition on an interface between a solid and a fluid ??? plzzz help me

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February 11, 2015, 03:09		#2
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	I Guess a solid-fluid interface would simply be a wall? What is the problem with applying a boundary condition there? Or are you using a solid zone and fluid zone? If so - why; why not just leave out the solid part, and make the interfaces walls?

February 11, 2015, 11:34		#3
ajdad New Member ajdad Join Date: Feb 2015 Posts: 5 Rep Power: 11	thank you CeesH for your reply, I explain my problem: I want to simulate a solar receiver. we have two coaxial tubes. the inner tube of length = 3m, it is made of steel it has a thickness = 3mm and receives a solar flux = 8000 W. the outer tube is made of glass. ==> Be simulated, the convective thermal exchanges between the internal tube and the area of the cavity ??? When I use ansys fluent, I find the problem of creating a shadow face of the outer face of the inner tube, which I must impose a condition (flux = 8000W) !!! Is what I will impose the boundary condition on the outer surface of the tube or on shadow face ???