Open flow past bluff body
 

I am going to simulate turbulent flow past a bluff body. However, the flow is not restricted by geometry in space.

I would like to reduce size of the computational domain and I have to apply appropriate boundary conditions for the "artificial walls" of the domain. I cannot use non-reflecting BC, because I have to use pressure-based solver. Could you please recommend how to deal with this problem?

Best regards,
doodek