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-   -   MULES in Eulerian solvers (https://www.cfd-online.com/Forums/openfoam-programming-development/228467-mules-eulerian-solvers.html)

MMNCH July 2, 2020 14:25

MULES in Eulerian solvers
 
Dear all friends...

I have an ambiguity about Eulerian solvers.
It is completely reasonable to use MULES in VOF based solvers like interFoam to keep the interface sharp. but in the eulerian based solvers like twoPhaseEulerFoam, multiPhaseEulerFoam, reactingEulerFoam, etc., why this limiter is used?
If I'm not mistaken, eulerian based solvers are not able to capture the interface and the nature of these methods is associated with dispersion , so what is the purpose of using this limiter in these solvers?
Can anyone clarify this issue for me? :confused:

Thanks in advance...

gianniTre July 7, 2020 14:25

Hi,


The main goal of MULES is to keep the scalar bounded without limiting to an upwind scheme. So more than keep the interface sharp the results is to reduce the numerical diffusion (which is kind of the same thing but more as a side effect).

What is designed to keep the interface sharp is mainly the "compression" velocity. You control this compression through the constant Calpha.

All the solvers you mentioned use MULES primarily to ensure a bounded solution limiting the numerical diffusion.


Cheers,
Giovanni

MMNCH July 7, 2020 14:58

Dear Dr. Tretola

Thank you very much for your reply.


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