I am trying to simulate flow for a tesla turbine. I have axial inlet velocity. What boundary condition should I put at the outlet to check pressure there?
Actually it depends on the conditions of the region. if the pressure at the boundary is all more than the pressure inside the domain then you can use outflow condition.if there is uncertainty of the pressure change i will suggest you to take long distance downstream of the working area of the domain to reduce the effects and then you can use either pressure outlet or outflow condition.