[betty96]

hi. i am very new in using star ccm. I have been trying to simulate the flow of waves over a boat with 2 meter long. i just using first order flow. I have chosen a velocity inlet boundary condition for inlet, top and bottom. pressure outlet for the outlet and I am using a symmetry plane. I have defined the inlet velocity and outlet pressure in terms of field functions of the waves. but when running it experiences reversed flow on some faces at the outlet. i have gained the result but not so accurate.

can anyone share how should i overcome the reversed flow? and did its effect my result accuracy?? thank you for sharing in advance

[ping]

with waves some reverse flow at a pressure outlet is common and in fact required at low hull speeds if you remember what the local flow of water is in a wave as it passes a point since a particle is circulating so must have both positive and negative velocity during the wave cycle
so you need to take a close look at the flow on that boundary by for example displaying velocity vectors on it and ensure it is cyclic etc and not going crazy for some other reason like poor dfbi motion etc