[Andrrrew]

Greetings,
in a 2D viscous simulation of a ship, (velocity inlet set at 1.9 m/s), which initial conditions should I set? And, since I set on the ship boundary "wall condition", in "shear stress specification" which setting is better, no slip or slip?
Thanks

[fluid23]

I would initialize your velocity field to 1.9 m/s in the direction it will flow and initialize pressure to zero everywhere. Only choose 'slip' if you want to exclude boundary layer formation on the hull... Slip essentially creates a frictionless wall boundary.

[me3840]

Originally Posted by Andrrrew

Greetings,
in a 2D viscous simulation of a ship, (velocity inlet set at 1.9 m/s), which initial conditions should I set? And, since I set on the ship boundary "wall condition", in "shear stress specification" which setting is better, no slip or slip?
Thanks

If you have to ask very basic questions like this, it might be worth it for you to take a step back and do some simpler simulations and read a little on CFD/fluid mechanics theory. The initial conditions and boundary conditions are very important concepts to understand.