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-   -   Constant pressure despite temperature changes? (http://www.cfd-online.com/Forums/openfoam-solving/115762-constant-pressure-despite-temperature-changes.html)

c_dowd April 6, 2013 00:35

Constant pressure despite temperature changes?
 
Hi.
I'm running a reacting foam case where I have edited the solver to ensure the density is constant. My problem is, I'm getting laminar flows (despite having an LES turbulence model turned on), which I can only attribute to the uniform pressure field in my results. The pressure field should not be uniform, as I have temperatures of up to 2000 in the flow.

As far as I can work out, this is in some way a result of my boundary conditions, yet no matter what combination I try I can't seem to solve it. I have a 3d cylindrical mesh with inlets on the sides and an outlet on the top. My inlets have a fixed velocity and zerogradient pressure, the outlet has zerogradient velocity and fixed pressure. I've tried various combinations of fixedfluxpressures and wavetransmissive BCs, yet still my pressure is perfectly uniform. Ideas?


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