[Roland R]

Hello,

I complated an interesting test. I calculate the flow around a simply 3D body (like a brick). The body is located in a large wind tunnel. A fix velocity was defined for inlet and static pressure for outlet. The simulation is steady state of course.

In second step, I prepared this same geometry but I defined a moving for the body (with deforming mesh method). The speed of displacement is same to velocity inlet of previous simulation. In this case there are not inlet and outlet, the body moved in a standing air field (v=0)

In other words I wanted to compare the wind tunnel investigation with the real moving of body.

Based on my comparison, the velocity distribution, the separated zones around the body are same but the pressure distribution at front face is different. The front face of moving body has higher average static pressure with 20%, as a result the acting drag force also is higher at the full body in the case moving body.

To tell the truth, I dont understand what is the reason of this difference.
What do you think about it? Does this difference come from simulation error? Or can the reality show similar differences?

Thanks
Roland