Hi everybody.... i'm trying to
Hi everybody.... i'm trying to solve s "simple" pressure-pressure case of a incompressible newtonian liquid flow in a 3D domain. I'm using simpleFoam with pressureInlet and pressureOutlet. The problem is that i really can't reach any kind of convergence...it seems OpenFOAM can't initialize the U field. I have really strange outflows with very high velocity (e+6,e+7) after just 1 step (and increasing it going on)!!
I'm using a pressure of 413 at inlet (2.8 bar divided by 678 kg/m3), 0 at outlet and epsilon=0.02 and k=4e-4...it should give a velocity, close to the inlet, of about 0.09 m/s!!!
I've tried with a potential case first, to initialize...but not results are reached. I would like to try with a boundaryFoam too...but it is like it doesn't exist!!
Can anyone help me????
P.S.: i've decreased relaxiation factors and i'm using most upwind schemes. I've played increasing and decreasing by 1 or 2 orders the tolerances too....but nothing seems to become better....
hello! Im a beginner at OpenFO
hello! Im a beginner at OpenFOAM but I got a familiar (unreasonable high) answer when i had mixed up my patches for inlet and outlet i.e. i got correct results when selecting my U negetiv at the inlet.
just an idea
well....i can't know exact val
well....i can't know exact values of velocity at every inlet node.... it should be calculated by the pressure exact value i'm imposing. I'll try to use an initialization of U at inlet with negative values following your idea, but i really would like to know HOW OpenFOAM initializes U field at pressureInlet boundary!
Hi, I'm another new user of
I'm another new user of OpenFoam, seeing a similar problem. I am running an inviscid pipe flow with pressure bounds and my velocity keeps increasing as I iterate. It works with inlet, specifying a velocity, but I can't get it with pressureinlet. Any ideas?
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