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Openfoam. Inlet pressure very low

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Old   September 9, 2022, 02:50
Default Openfoam. Inlet pressure very low
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Hi Foamers.

I'm trying simulate pump flow.
The pump is designed for 30000 rpm 3 l/min 80 mmHg, which is confirmed by experiments and calculations in other CAE. But in openfoam, i've get pressure difference 4-5 Pa.
I think the problem is in the boundary conditions, but I could not find it. If You have other thoughts, please, share them

Log of 240th iteration of simpleFoam is below (further values ​​change slightly)

Code:
smoothSolver:  Solving for Ux, Initial residual = 0.00394491, Final residual = 0.00022398, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.00389601, Final residual = 0.00022125, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.00570575, Final residual = 0.000306543, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.0503755, Final residual = 0.00293809, No Iterations 2
time step continuity errors : sum local = 6.72665e-07, global = 2.32316e-09, cumulative = 1.00009e-05
smoothSolver:  Solving for omega, Initial residual = 0.00117568, Final residual = 8.79286e-05, No Iterations 1
smoothSolver:  Solving for k, Initial residual = 0.00313401, Final residual = 5.56594e-05, No Iterations 2
ExecutionTime = 1361.91 s  ClockTime = 1405 s

forces forces write:
    Sum of forces
        Total    : (0.00305886 -0.00154441 -0.134079)
        Pressure : (0.00324561 -0.00159584 -0.139155)
        Viscous  : (-0.000186742 5.14305e-05 0.00507611)
    Sum of moments
        Total    : (-7.04679e-06 -4.31999e-06 0.000150628)
        Pressure : (-6.99755e-06 -4.96397e-06 0.00014441)
        Viscous  : (-4.92465e-08 6.43985e-07 6.21741e-06)
    writing force and moment files.

surfaceFieldValue inflow write:
    areaAverage(inlet) of p = -3.89296
    areaAverage(inlet) of U = (-1.82488e-14 -1.8254e-14 4.25727)

surfaceFieldValue outflow write:
    areaAverage(outlet) of p = -2.57171e-05
    areaAverage(outlet) of U = (0.011222 0.000127945 0.227246)

surfaceFieldValue RotorVelocity write:
    max(rotating) of p = 10.1998
    max(rotating) of U = (8.29436 8.1681 0)
Here's k, omega, nut, p and U configs

k.txt

nut.txt

omega.txt

p.txt

U.txt

Last edited by gmortahr; September 9, 2022 at 07:11.
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axial pump, mrf, openfoam

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