# Openfoam. Inlet pressure very low

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 September 9, 2022, 01:50 Openfoam. Inlet pressure very low #1 New Member   Join Date: Aug 2022 Posts: 3 Rep Power: 3 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 06:11.

 Tags axial pump, mrf, openfoam

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