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Forum: OpenFOAM Running, Solving & CFD

July 20, 2012, 03:24

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

Hi Daniel! 1. Using SuSp operator is to...

Hi Daniel!

1. Using SuSp operator is to increase matrix diagonal influence. With Sp operator it goes always to the diagonal and can reduce diagonal elements which makes its solution more...

Forum: OpenFOAM Running, Solving & CFD

May 26, 2011, 16:14

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

Alberto, thanks! I got it: U = U* + delta ...

Alberto, thanks! I got it:

U = U* + delta
U* = U - delta
U* - exact solution, delta - error vector

div(U*) = 0 (1)
div(U) = div(U*) + div(delta)...

Forum: OpenFOAM Running, Solving & CFD

May 26, 2011, 11:04

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

Sometimes for the discretization (e.g. for the...

Sometimes for the discretization (e.g. for the finite differences method) it is easier to use nonconservative form of the convectional term

div(U*k) = k*div(U)+U & grad(k)

But here we get the...

Forum: OpenFOAM Running, Solving & CFD

May 26, 2011, 05:36

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

So I agree with Alberto, that U*grad(k) or...

So I agree with Alberto,
that U*grad(k) or U*grad(epsilon) or U*grad(omega) are discretized.

Hmm..., why? Is it some error?

For example, standard k-epsilon, transport of kinetic energy is:
...

Forum: OpenFOAM Running, Solving & CFD

May 26, 2011, 05:14

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

... I ask because IT IS, for example, in...

... I ask because IT IS, for example, in realizableKE (incompressible) in OF 1.7.1:

// Dissipation equation
tmp<fvScalarMatrix> epsEqn
(
fvm::ddt(epsilon_)
+...

Forum: OpenFOAM Running, Solving & CFD

May 25, 2011, 11:56

Replies: 11

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Views: 4,870

Posted By makaveli_lcf

Convectional term -fvm::Sp(fvc::div(phi_), epsilon_) in RNGkEpsilon OF 1.7.1 missing

Hi!

I have a quistion: why this terms are missing in RNGkEpsilon model in epsilon and k equations?

fvm::ddt(epsilon_)
+ fvm::div(phi_, epsilon_)
-...

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