[coupsdebambous]

Hi all,


I'm setting up a pipe flow sim with two outlets and one inlet, a Tee in-between, incompressible liquid, simpleFoam, komegaSST turbulence, good y+30 mesh, numerical schemes similar to the pipeCyclic tutorial.
I have to impose volumetric flow at the two outlets and pressure at the inlet.
patchSummary:

Valid fields:
    volScalarField    nut
    volVectorField    U
    volScalarField    k
    volScalarField    p
    volScalarField    omega

group    : wall
    scalar        nut        nutkWallFunction
    scalar        k        kqRWallFunction
    scalar        p        zeroGradient
    scalar        omega        omegaWallFunction
    vector        U        noSlip

patch    : in1
    scalar        nut        calculated
    scalar        k        zeroGradient
    scalar        p        totalPressure
    scalar        omega        zeroGradient
    vector        U        pressureInletOutletVelocity

patch    : out2
patch    : out1
    scalar        nut        calculated
    scalar        k        inletOutlet
    scalar        p        zeroGradient
    scalar        omega        inletOutlet
    vector        U        flowRateOutletVelocity

group    : processor
    scalar        nut        processor
    scalar        k        processor
    scalar        p        processor
    scalar        omega        processor
    vector        U        processor

I get wild divergence after a few iterations (omega then continuity blowing up), while the same setup converges just fine if I get rid of one of the outlets.
Is two fixed outgoing flow rates the problem?
Anyone has ever run something similar?


Thanks in advance for any help.
Q