[ziyasaydam]

Dear All,

I am working on 6-dof analysis of a sail boat hull for which I have the experiment results. Drag, sinkage and trim results as well as the wave profile are fine for low speed analysis.

However, as I increase the speed and the boat approaches planing regime, drag results started deviating from the experimental results. I found out that this deviation is due to a rather unphysical and weird air phase being formed on the bottom of the hull, along from the bow to the transom!!! I have attached two pictures from the analyses for better understanding of the problem.

So far, I tried changing time step, turbulence model and grid density, all without success. Has anybody experienced similar issues? Or any ideas why this is happening?

Thanks in advance,

Ziya