How are aerodynamic coefficients computed in SU2?

amitkamboj · May 16, 2015, 05:57

Hello!

I am solving for axisymmetric flow using 2D grid with four boundaries: inflow, outflow, wall and symmetry. 'history.csv' file is being read to find the lift and drag coefficient for the wall boundary.

I also extracted the pressure and grid points from 'flow.vtk' and manually computed the drag coefficient value. What I have concluded is that the drag value mentioned in 'history.csv' is actually for the 2D planar body even though the flow solved is axisymmetric.

Has anybody else tried it? I want to confirm that this is in fact the case.

Thank you!

awendorff · May 19, 2015, 17:33

In SU2, the 2-D section area is used for the 2-D problem. The areas must be specified by the user. Even for an axi-symmetric problem, the area specified will be the area used by SU2 to calculate the coefficient outputs.

amitkamboj · May 20, 2015, 00:18

Quote:

Originally Posted by awendorff

In SU2, the 2-D section area is used for the 2-D problem. The areas must be specified by the user.

I am talking about the area on which the pressure is integrated not the area value used for non dimensionalization.

Thank You.

awendorff · May 20, 2015, 00:35

Right. SU2 only knows the area in the mesh. It is not creating a 3-D area due to the axi-symmetric boundary condition.

May 16, 2015, 05:57	How are aerodynamic coefficients computed in SU2?	#1
amitkamboj New Member Amit Kamboj Join Date: Jan 2015 Posts: 11 Rep Power: 11	Hello! I am solving for axisymmetric flow using 2D grid with four boundaries: inflow, outflow, wall and symmetry. 'history.csv' file is being read to find the lift and drag coefficient for the wall boundary. I also extracted the pressure and grid points from 'flow.vtk' and manually computed the drag coefficient value. What I have concluded is that the drag value mentioned in 'history.csv' is actually for the 2D planar body even though the flow solved is axisymmetric. Has anybody else tried it? I want to confirm that this is in fact the case. Thank you!

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May 19, 2015, 17:33		#2
awendorff New Member Andrw Wendorff Join Date: Apr 2014 Posts: 28 Rep Power: 12	In SU2, the 2-D section area is used for the 2-D problem. The areas must be specified by the user. Even for an axi-symmetric problem, the area specified will be the area used by SU2 to calculate the coefficient outputs.

May 20, 2015, 00:35		#4
awendorff New Member Andrw Wendorff Join Date: Apr 2014 Posts: 28 Rep Power: 12	Right. SU2 only knows the area in the mesh. It is not creating a 3-D area due to the axi-symmetric boundary condition.