[MathewKerala]

I am doing an analysis on a rectangular channel with and without slip. I know the pressure drop in the pipe and the outlet pressure. How can I give this as the boundary condition?

[GregCFD]

One of the options in the boundary condition menu is for a pressure inlet, seeing as you've got the outlet pressure and pressure drop it's nice and straight forward to calculate the inlet pressure.

[MathewKerala]

Originally Posted by GregCFD

One of the options in the boundary condition menu is for a pressure inlet, seeing as you've got the outlet pressure and pressure drop it's nice and straight forward to calculate the inlet pressure.

But there is option to enter Total pressure as inlet BC and static pressure as outlet BC only.

[GregCFD]

Originally Posted by MathewKerala

But there is option to enter Total pressure as inlet BC and static pressure as outlet BC only.

My reading of the manual suggests that you should be specifying the Total Pressure, the other option "Supersonic/Initial Gauge Pressure" is ignored for subsonic flows. With the exception being initialization of the problem using the Hybrid method in which you can specify the static pressure but if you don't Fluent will make a guess for you anyway.

[MathewKerala]

What I meant was that there is no option to enter the static pressures at inlet and outlet together. At Inlet there is option to enter total pressure but at outlet there is option for static pressure. I have the difference of static pressures in the pipes (pressure loss in pipe). Is there any way to enter that as a boundary condition?

[GregCFD]

Ah sorry I misunderstood you, maybe someone with a bit more practice can help you out but the only way I can think of doing that is to either use a UDF to automatically modify the pressure to suit or to calculate the flow rate and approximate the velocity and hence the total pressure that way.