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-   -   A question on fvm::Sp(epsilon/k, k) (https://www.cfd-online.com/Forums/openfoam-programming-development/114622-question-fvm-sp-epsilon-k-k.html)

GerhardHolzinger March 14, 2013 07:18
A question on fvm::Sp(epsilon/k, k)
 
Hello,

this is more a question of how to understand this term:

Code:
fvm::Sp(epsilon/k, k)
This term is on the rhs of the kEqn of the kEpsilon model.

Why is this form used?

Mathematically, one could also write:

Code:
fvm::Sp(epsilon)

Chris Lucas March 18, 2013 03:08
Hi

the reason is stability of the linear equation system

this would go into the source vector
fvm::Sp(epsilon)

and this in the matrix of the linear equation system.
fvm::Sp(epsilon/k, k)

Regards,
Christian

sharonyue April 14, 2014 20:26
Quote:
Originally Posted by Chris Lucas (Post 414614)
Hi

the reason is stability of the linear equation system

this would go into the source vector
fvm::Sp(epsilon)

and this in the matrix of the linear equation system.
fvm::Sp(epsilon/k, k)

Regards,
Christian
Hi Christian,

If this fvm::Sp(epsilon) go into the source vector, why dont we use epsilon instead?


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