About devReff() and divDevReff() in kEpsilon.C -- CFD Online Discussion Forums

August 24, 2009, 03:05	About devReff() and divDevReff() in kEpsilon.C	#1
Zheng.Zhi New Member Zheng.Zhi Join Date: Jul 2009 Location: LanZhou China Posts: 10 Rep Power: 17	In incompressible case , in kEpsilon.C , devReff() = -nuEff()dev(twoSymm(fvc::grad(U_))) , we know divU=0 in incompressible case , so why not use devReff() = -nuEff()twoSymm(fvc::grad(U_)) , is there any CFD programming technique to use dev() function ? And in incompressible case , divDevReff() = -fvm::laplacian(nuEff(),U) - fvc::div(nuEff()*dev(fvc::grad(U)().T())) , is there any special reason use dev() function ? or why not use dev2(fvc::grad(U)().T()) as in compressible case ? thanks a lot .

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