Codes about Boundary conditions

KleinMoretti · April 10, 2024, 23:07

Hello, everyone.

I've been reading SU2 code for a long time, but I still don't understand how the boundary conditions are imposed.

For example, the far field boundary, in the BC_Farfield function, it also calculates the convection flux and the viscous flux at some interface. It does not seem to take a direct assignment or interpolation method, the boundary vertexes are treated somewhat similar to the internal grids.

I guess it uses ghost points to build boundary elements, right?

Is there any reference to the vertex-based FVM for treating boundary conditions?

Thanks for any kind reply!

bigfootedrockmidget · April 11, 2024, 03:06

Yes, we use ghost points, here is some explanation:
https://web.stanford.edu/group/frg/c...-AA214-Ch8.pdf

I do not know of a CFD book that clearly explains the weak vs strong boundary conditions.

April 10, 2024, 23:07	Codes about Boundary conditions	#1
KleinMoretti Member AN Join Date: Jan 2024 Posts: 44 Rep Power: 2	Hello, everyone. I've been reading SU2 code for a long time, but I still don't understand how the boundary conditions are imposed. For example, the far field boundary, in the BC_Farfield function, it also calculates the convection flux and the viscous flux at some interface. It does not seem to take a direct assignment or interpolation method, the boundary vertexes are treated somewhat similar to the internal grids. I guess it uses ghost points to build boundary elements, right? Is there any reference to the vertex-based FVM for treating boundary conditions? Thanks for any kind reply!

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April 11, 2024, 03:06		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 676 Rep Power: 21	Yes, we use ghost points, here is some explanation: https://web.stanford.edu/group/frg/c...-AA214-Ch8.pdf I do not know of a CFD book that clearly explains the weak vs strong boundary conditions.