loss in force
I calculated for testpurposes a very simple 2dproblem: a channel with length l and symmetry, velocityinlet and an outflow. I used the standardwallmodel and keps. The y+ are between 150 and 300 and ok. Now the problem: If I take the shearforce at a part of the wall (the flow is developed) I get 3.3 (dimensionless) The other way would be to calculate it by hand:
F_res=rho*c1**2rho*c2**2+p1*A1p2*A2 with c1=c2 and A1=A2, I get: F_res=A*(p1p2) If I sum up the areaweighted pressure at the positions 1 and 2 I only get 2.6 as the resulting force. It seems, I lost about 0.7..where are they ? 
Re: loss in force
(1). Check the equation first, where did you get this equation?

Re: loss in force
ok. error in the equation, sorry. It should be rho*ci**2*Ai (!!), and if I sum it up in the correct integral (!) form, i get the correct result...

Re: loss in force
(1). Congratulation! (2). I wasn't so sure when I answered your question. So, You should say, you found your own errors.

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