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Senior Member
Farzad Faraji
Join Date: Nov 2019
Posts: 206
Rep Power: 7 ![]() |
Hello all
I am using pimpleFoam(LES) to simulate water jet. My mesh is good and it can resolve the jet, but I need to add synthetic turbulence in to nozzle jet since it is to strong and coherent without entrance turbulence. I am using OF2112, U(especially turbulentDFSEMInlet)and P boundary conditions as I put in below. With 10% turbulence intensity, my jet is still very coherent and does not dissipate as I attached the jet figure to this thread. what should I do? Are mt Turbulence Intensity parameter defined logically? Nozzle diameter = 0.005 m Nozzle velocity = 0.64 m/s Boundary conditions for Nozzle_Outlet (turbulentDFSEMInlet); Code:
Nozzle_Outlet { type turbulentDFSEMInlet; delta 0.005; // 1*0.005; //Characteristic length scale R uniform (0.004096 0.0 0.0 0.004096 0.0 0.004096); // 10%*0.64==>0.064=======>0.064^2=0.004096 U uniform (0.0 0.64 0.0); value uniform (0.0 0.64 0.0); L uniform 0.001; // 0.2*0.005=0.001 nCellPerEddy 2; } Code:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 6 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volVectorField; location "0"; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { TopWall { type inletOutlet; inletValue uniform (0 0 0); value uniform (0 0 0); } fixedWalls { type fixedValue; value uniform (0 0 0); } Nozzle_solidBodys { type fixedValue; value uniform (0 0 0); } Nozzle_Outlet { type turbulentDFSEMInlet; delta 0.005; // 1*0.005; //Characteristic length scale R uniform (0.004096 0.0 0.0 0.004096 0.0 0.004096); // 10%*0.64==>0.064=======>0.064^2=0.004096 U uniform (0.0 0.64 0.0); value uniform (0.0 0.64 0.0); L uniform 0.001; // 0.2*0.005=0.001 nCellPerEddy 2; } } // ************************************************************************* // Code:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 6 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volScalarField; location "0"; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { TopWall { type fixedMean; meanValue constant 0; value uniform 0; } fixedWalls { type fixedFluxPressure; gradient uniform 0; value uniform 0; } Nozzle_solidBodys { type fixedFluxPressure; gradient uniform 0; value uniform 0; } Nozzle_Outlet { type zeroGradient; } } // ************************************************************************* // Farzad |
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Tags |
jet, les, openfoam, pimplefoam, turbulence intensity |
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