Ksl (momentume exchange) limit

Submitted by evansmuts on Mon, 08/27/2012 - 11:03

Hi

For my model I am using the cfdemSolverPiso solver (v2.3) with implicit momentum coupling. I see in the "couplingProperties" file, there is an option to limit the value of Ksl (momentum exchange field) that gets transferred ("implicitCoupleProps").

Limiting this value is supposed to give good stability in the solution. But is there any other reason for the limit? Should the value always be limited, or should the simulation be allowed to transfer the maximum value?

Thanks

Evan

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cgoniva's picture

cgoniva | Mon, 08/27/2012 - 12:00

Hi Evan,

you can use the limiter to completely switch off the momentum exchange (e.g. when looking for reasons of bad convergence)

Usually you should not use the limiter, as it would cut off the momentum exchange! (Anyway it can help to make cases with very strong flow fluctuations more stable.)

Cheers,
Chris

evansmuts | Tue, 08/28/2012 - 14:22

Hi Chris

Thanks so much for your reply. It seems I had the right idea about the Ksl limit then.

Cheers
Evan