I'm modelling flow (steady state) over a ship at different wind angles. Some angles lead to a converged solution and others lead to the residuals (and surface velocity monitors) oscillating quite wildly as the solution proceeds after initial trend towards convergence. I've tried decreasing and increasing the under-relaxing factors, and have tried k-w and realizable k-e turbulence models. I'm using 2nd order or above discretisation. Anyone know why I'm still having trouble getting convergence? Thanks.

Chance is that the flow won't remain steady - shedding around the super-structure on the deck. You may want to model it using the unsteady solver option.

hi check your momentum under relaxtion and meshing also nabeel