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Showing results 1 to 6 of 6 Search took 0.00 seconds. Search: Posts Made By: henry

Forum: OpenFOAM Bugs February 18, 2009, 11:04

Replies: 14 LES model formulation Views: 4,323 Posted By henry For incompressible flow I:dev( For incompressible flow I:dev(D) = tr(D) = 0 and so dev(D) = D. However numerically on a collocated mesh this is not exactly true and there will be some difference between using D and dev(D) but it...

Forum: OpenFOAM Bugs March 12, 2008, 11:27

Replies: 14 LES model formulation Views: 4,323 Posted By henry D should be deviatoric for inc D should be deviatoric for incompressible but numerics is not exact and div(U) != 0 exactly although div(phi) is zero to within solver tolerance. Using dev(D) ensures it deviatoric irrespective of...

Forum: OpenFOAM Bugs October 24, 2007, 11:56

Replies: 14 LES model formulation Views: 4,323 Posted By henry Yes I agree, the laminar stres Yes I agree, the laminar stress is sub-grid and so there is no reason why it should not be included in the definition of sub-grid stress used by the momentum equation. I think Beff is a good idea,...

Forum: OpenFOAM Bugs October 24, 2007, 11:37

Replies: 14 LES model formulation Views: 4,323 Posted By henry In sub-grid stress models B is In sub-grid stress models B is the stress corresponding to sub-grid turbulence and does not include the laminar stress so defining B from eddy viscosity models to include it would be inconsistent. I...

Forum: OpenFOAM Bugs October 24, 2007, 11:28

Replies: 14 LES model formulation Views: 4,323 Posted By henry Currently we use B to refer to Currently we use B to refer to the sub-grid stress and R the Reynolds stress which in LES runs is obtained by averaging the velocity fluctuations. divDevB is as intersting idea but is this...

Forum: OpenFOAM Bugs October 24, 2007, 10:14

Replies: 14 LES model formulation Views: 4,323 Posted By henry > B currently returns the > [QUESTION 1] B currently returns the sub-grid stress generated by the sub-grid turbulence and does not include the laminar stress. divB returns the divergence of sub-grid stress including...

Showing results 1 to 6 of 6

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