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Transpiration b.c.

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Old   September 28, 2021, 16:01
Red face Transpiration b.c.
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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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Old   September 29, 2021, 08:39
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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
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Old   September 29, 2021, 18:28
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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 .
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Old   October 20, 2021, 13:27
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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).
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Old   November 26, 2021, 13:16
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Quote:
Originally Posted by DLADO View Post
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.
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