Transpiration b.c.

DLADO · September 28, 2021, 15:01

Hi. New to SU2. Trying to model bleed and blowing, and wanted to use the transpiration boundary condition. How do you do this in SU2? Assume specific marker for the boundary/wall in the cfg file, but what is the exact command and arguments. Searched around github, but can't find anything with the transpiration implementation details. Thx.

TKatt · September 29, 2021, 07:39

Hi,

I have to admit I am not sure what a transpiration BC is. If you could quickly explain or give a reference to what you have in mind that would help. Also in which context are you using that.

Searching through the code-base revealed no hits for "transpiration" and I also never saw that. So I guess it is not present. But it is usually not too difficult to code up a boundary condition yourself. If you are interested in doing that please let me know.

Best, Tobi

bigfootedrockmidget · September 29, 2021, 17:28

Hi,

I guess you mean a (semi) permeable or porous wall, where a certain amount of flow passes through the wall, either naturally or forced. This would mean either having a wall with a nonzero normal velocity or some modified surface velocity gradient based on Darcy's law. In any case we do not have such a boundary condition right now. As Tobi said, if you can be more specific then we can help you .

DLADO · October 20, 2021, 12:27

Yes. I mean permeable wall b.c. to pass mass flow across the surface wall. For example, mass out from wall (remove from flow surface) to simulate bleed/suction (i.e. to remove low momentum boundary layer).

davecats · November 26, 2021, 12:16

Quote:

Originally Posted by DLADO

Yes. I mean permeable wall b.c. to pass mass flow across the surface wall. For example, mass out from wall (remove from flow surface) to simulate bleed/suction (i.e. to remove low momentum boundary layer).

Hi, have you made any progress with the new boundary condition? I am planning to do the same but I have not been very successful yes. I was trying to make a kind of merge between the Inlet/Outlet and the constant temperature wall boundary condition. I have not really been succesfull at the moment. As a test case for testing the effect of the BC I am using the laminar compressible boundary layer.

September 28, 2021, 15:01	Transpiration b.c.	#1
DLADO New Member CA-AB Join Date: Sep 2021 Posts: 2 Rep Power: 0	Hi. New to SU2. Trying to model bleed and blowing, and wanted to use the transpiration boundary condition. How do you do this in SU2? Assume specific marker for the boundary/wall in the cfg file, but what is the exact command and arguments. Searched around github, but can't find anything with the transpiration implementation details. Thx.

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September 29, 2021, 07:39		#2
TKatt Member na Join Date: Jul 2018 Posts: 83 Rep Power: 7	Hi, I have to admit I am not sure what a transpiration BC is. If you could quickly explain or give a reference to what you have in mind that would help. Also in which context are you using that. Searching through the code-base revealed no hits for "transpiration" and I also never saw that. So I guess it is not present. But it is usually not too difficult to code up a boundary condition yourself. If you are interested in doing that please let me know. Best, Tobi

September 29, 2021, 17:28		#3
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 500 Rep Power: 17	Hi, I guess you mean a (semi) permeable or porous wall, where a certain amount of flow passes through the wall, either naturally or forced. This would mean either having a wall with a nonzero normal velocity or some modified surface velocity gradient based on Darcy's law. In any case we do not have such a boundary condition right now. As Tobi said, if you can be more specific then we can help you .

October 20, 2021, 12:27		#4
DLADO New Member CA-AB Join Date: Sep 2021 Posts: 2 Rep Power: 0	Yes. I mean permeable wall b.c. to pass mass flow across the surface wall. For example, mass out from wall (remove from flow surface) to simulate bleed/suction (i.e. to remove low momentum boundary layer).