Air flowing over a still water body - BC of interface

blyatman · May 30, 2023, 23:02

Hi all,

I'm trying to simulate a steady-state case of incompressible air flowing over a still body of water, where there is sunlight that impacts the surrounding ground surface and the water body. My goal is to determine the temperature of the water body.

What is the boundary condition of the interface between the air and the water? It does not make sense to use a wall. Should I be setting the surface to interior?

I am using the solar ray tracer, but no radiation model. I am not interested in the movement of the water body, so there is no need to use VOF.

CFDKareem · May 31, 2023, 11:39

I would use a coupled wall between the two fluids.

blyatman · June 1, 2023, 08:29

Quote:

Originally Posted by CFDKareem

I would use a coupled wall between the two fluids.

But wouldn't that imply that there is a no-slip boundary condition between two fluids though?

May 30, 2023, 23:02	Air flowing over a still water body - BC of interface	#1
blyatman Member BM Join Date: Sep 2021 Posts: 35 Rep Power: 5	Hi all, I'm trying to simulate a steady-state case of incompressible air flowing over a still body of water, where there is sunlight that impacts the surrounding ground surface and the water body. My goal is to determine the temperature of the water body. What is the boundary condition of the interface between the air and the water? It does not make sense to use a wall. Should I be setting the surface to interior? I am using the solar ray tracer, but no radiation model. I am not interested in the movement of the water body, so there is no need to use VOF.

May 31, 2023, 11:39		#2
CFDKareem Senior Member Kareem Join Date: Nov 2022 Location: New York Posts: 125 Rep Power: 5	I would use a coupled wall between the two fluids. __________________ Please like the answer if it helped! Video Tutorials and Tips: https://www.youtube.com/@cfdkareem/featured

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