Possible missing turbulent stress terms in sonicTurbFoam

srinath · November 25, 2008, 13:46

Description
Certain terms such as laminar viscosity and work done by turbulent/laminar viscous stresses seem to be ignored.

Solver
sonicTurbFoam

sourceFiles
sonicTurbFoam.C, hEqn.H

Version
1.5

Notes
line 63
fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(phi, U)
+ turbulence->divDevRhoReff(U)
);
--Laminar viscous stress not taken into account. Possibly igonored because it is negligible compared to Turbulent viscosity. But what about effect of bulk viscosity at high Mach no's for compressible flows?

file hEqn.H
solve
(
fvm::ddt(rho, h)
+ fvm::div(phi, h)
- fvm::laplacian(turbulence->alphaEff(), h)
==
DpDt
);
--Work done by turbulent viscous surface stress does not appear to be taken into account.

Srinath

henry · November 25, 2008, 16:10

Yes currently ignored as they are small in general but they are easy to include if required by your particular application.

H

srinath · November 26, 2008, 02:59

Thanks Henry

November 25, 2008, 13:46	Description Certain terms suc	#1
srinath Member srinath Join Date: Mar 2009 Location: Champaign, USA Posts: 91 Rep Power: 17	Description Certain terms such as laminar viscosity and work done by turbulent/laminar viscous stresses seem to be ignored. Solver sonicTurbFoam sourceFiles sonicTurbFoam.C, hEqn.H Version 1.5 Notes line 63 fvVectorMatrix UEqn ( fvm::ddt(rho, U) + fvm::div(phi, U) + turbulence->divDevRhoReff(U) ); --Laminar viscous stress not taken into account. Possibly igonored because it is negligible compared to Turbulent viscosity. But what about effect of bulk viscosity at high Mach no's for compressible flows? file hEqn.H solve ( fvm::ddt(rho, h) + fvm::div(phi, h) - fvm::laplacian(turbulence->alphaEff(), h) == DpDt ); --Work done by turbulent viscous surface stress does not appear to be taken into account. Srinath

November 25, 2008, 16:10	Yes currently ignored as they	#2
henry Senior Member Join Date: Mar 2009 Posts: 854 Rep Power: 22	Yes currently ignored as they are small in general but they are easy to include if required by your particular application. H

November 26, 2008, 02:59	Thanks Henry	#3
srinath Member srinath Join Date: Mar 2009 Location: Champaign, USA Posts: 91 Rep Power: 17	Thanks Henry

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