I am working on heat transfer and pressure drop study of tubular (double-pipe)heat exchanger.For numerical simulation ,I am using CFD software Ansys fluent 17.0.The boundary conditions i used are
Inlet==Velocity inlet(specified velocity)
outlet==Pressure outlet
However ,when I try to obtain the pressure ,i get the following
inlet pressure(Pin)==267Pa(for my case)
Outlet pressure(Pout)==0pa
which gives pressure drop =Pin-Pout=267Pa
My question is, why am I getting zero pressure at outlet?.It doesn't look logical.The pressure decreases in the flow direction, not necessarily zero.Am I making some mistakes on boundary conditions ?or I should use Total pressure instead of Static pressure, for calculating pressure drop?.Anyone with an experience on Ansys Fluent, I appreciate your help.Thanking in advance
Hey,
I'm not familiar with Ansys Fluent and your special case. However, Ansys is automatically setting the outlet pressure a 0Pa, as far as I understood. But I dont know if it is a reference pressure, or the "real" static one.
Further I wonder, why you prescribe pressure and velocity at the inlet, or did I just missunderstood you? Because if you do both, your system has too many input parameters.
Cheers
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