CFD中文网

1. 速度场
   
2. 压力场
   
3. 粘度场
   

粘度边界：进出口calculated，机翼表面nutUSpaldingWallFunction，上下边界symmetry简化问题

计算收敛，domainminandmax监测稳定无震荡

求解器：default interPhaseChangeFoam，ofv1912

湍流模型：kEqn LES

粘度场异常原因？

Original RC interplation
No time dependency, No relaxation of the velocity field:

// Rhie-Chow interplation
phi = (U_avg_f & mesh.Sf()) 
    - ( (DUf*( gradp_f - gradp_avg_f)) & mesh.Sf() );

Time dependency, relaxation of the velocity field:

// Rhie-Chow interplation
phi = (U_avg_f & mesh.Sf()) 
    - ( (DUf*( gradp_f - gradp_avg_f)) & mesh.Sf() )
    + (scalar(1) - URFU)*(phi.prevIter() - (U_avg_prevIter_f & mesh.Sf()))
    + DTf*( phi_old - (U_old_f& mesh.Sf()));

OpenFOAM
No time dependency, with or without relaxation of the velocity field (check simpleFoam solver):

surfaceScalarField phiHbyA("phiHbyA", fvc::interpolate(HbyA) & mesh.Sf());

Questions: Where is the second term of the original RC? Where is the third term of the original RC if taking the relaxation of the velocity field into consideration?

Time dependency, relaxation of the velocity field (check pisoFoam solver):

surfaceScalarField phiHbyA
 (
     "phiHbyA",
     (fvc::interpolate(HbyA) & mesh.Sf())
   + fvc::ddtPhiCorr(rAU, U, phi)
);

Questions: ddtPhiCorr takes the function of (the third term+the fourth term of the original RC)? I guess NO. Let's recall the definition of ddtPhiCorr:

tmp<fluxFieldType> ddtPhiCorr
(
    new fluxFieldType
    (
        ddtIOobject,
        rDeltaT
      * this->fvcDdtPhiCoeff(U.oldTime(), phiAbs.oldTime())
      * (
             fvc::interpolate(rA*rho.oldTime())*phiAbs.oldTime()
           - (
                    fvc::interpolate(rA*rho.oldTime()*U.oldTime())
                  & mesh().Sf()
              )
         )
    )
);

Look like ddtPhiCorr returns the following codes:

fvcDdtPhiCoeff*DTf*( phi_old - (U_old_f& mesh.Sf()));

Last question: How to take the effect of relaxation of the velocity field into ddtPhiCorr?
谢谢