| xianqiejiao |
December 2, 2014 23:28 |
Why is new convection theme used is the rhoEqn ?
Hi Everyone,
While I am reading the code I got from my friend, I find following code:
Code:
tmpPhi=phi;
tmp<fv::convectionScheme<scalar> > mvConvection
(
fv::convectionScheme<scalar>::New
(
mesh,
fields,
tmpPhi,
mesh.divScheme("div(phi,Yh)")
)
);
//Density equation
fvScalarMatrix rhoEqn
(
fvm::ddt(rho) + mvConvection->fvmDiv(tmpPhi, rho)
);
rhoEqn.solve();
It seems that this code has created a new convection themes, and apply it like
Code:
turbulence->divDevRhoReff(rho, U)
My first question is that what is the difference between this new rho equation and its original form?
And latter, the new convection theme is used again as following:
Code:
fvScalarMatrix YEqn
(
fvm::ddt(rho,Y)
+ urho*mvConvection->fvmDiv(tmpPhi, Y)
+ fvm::laplacian(Dcoeff,Y)
);
where urho is defined as
Code:
const dimensionedScalar urho //for tmpPhi = phi || rhoPhi
(
"urho",
dimensionSet(1,-3,0,0,0,0,0),
scalar(1.0)
);
My second question is why the new convection theme is used again here and why do we need the "urho".
Have anyone met this before? |
