Pseudo pressure in projection mtd and cl/cd

Kopa

Hello,

I have come across several variants of the projection methods and it seems that the "pressure" in the poisson eqn is just a "pseudo pressure". However, it doesn't affect the computation because in incompressible flow, it is the gradient which matters.

But what about in the computation of lift/drag coefficient? The surface pressure is required to obtain the inviscid force. It is not the gradient. In that case, one additional step is required to get back the "real" pressure to get cl/cd.

Is that so? thank you.