I try to simulate only the water under a skimboard (surfboard).

I put an initial velocity for the axis x = 2.7m/s

I put a real wall with a velocity of 2.7m/s

I put a real wall under the skimboard with a velocity of 0m/s

And I select the two surfaces for the environment pressure.

The picture with the pressure is true.

But for the picture of the velocity there is a mistake. I don't known where?

Can someone help me, please. Thank you