[terrybarnaby]

I have attempted to produce a wind tunnel test case matching the Ahmed test case using OpenFoam 1.5 (SVN from 2009.06.05).

Title: Ahmed case with 25 degree sloping rear
Tunnel: 8x4x3 meters (A bit different from the standard cases)
Speed: 40m/s

The simulation appears to be generally working, but the force and forceCoefficient values calculated appear to be far too high.

From reading around I was expecting values around:
ExpectedDragForce: 30N
ExpectedCd: 0.3

However, I am getting much higher than this:
DragForce: 53N
Cd: 0.53

I have tried many things but still come to these same values.
I wonder if anyone can see what I am doing wrong.
I have attached my current settings which uses the simpleFoam solver. My test mesh is at: http://www.greenpower.beamweb.co.uk/...ed-mesh.tar.gz

This is a low cell count mesh (about 100,000) but I have tried up to a million cells with no effect. It appears to be close to convergence after about 50 iterations of simpleFoam using the 100,000 cell mesh. Any ideas would be appreciated.