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IDProjectCategoryView StatusLast Update
0003036OpenFOAMFeaturepublic2018-08-09 23:08
ReporteratulkjoyAssigned Tohenry 
PrioritynormalSeverityminorReproducibilitysometimes
Status closedResolutionno change required 
PlatformLinuxOSCentOSOS Version7.0
Product Versiondev 
Fixed in Version 
Summary0003036: Turbulence Model correction for RANS
DescriptionIn my version of OpenFoam I have seen following lines
134
  C3_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "C3",
            this->coeffDict_,
            -0.33
        )
    ),
142
and
In epsilon matrix
fvm::SuSp(((2.0/3.0)*C1_ + C3_)*alpha()*rho()*divU, epsilon_)

I guess default value of RDT coefficient C3 should be 0

also Transport term should be following

fvm::SuSp(((2.0/3.0)*C1_ - C3_)*alpha()*rho()*divU, epsilon_)


If issue is been noticed and corrected please notify
Steps To Reproducechanging Lines 136 to 142 as

C3_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "C3",
            this->coeffDict_,
            0
        )
    ),

changing Transport equation for epsilon as

fvm::SuSp(((2.0/3.0)*C1_ - C3_)*alpha()*rho()*divU, epsilon_)

TagsNo tags attached.

Activities

henry

2018-08-09 19:25

manager   ~0009938

The default C3 should be -0.33, if you want to run with 0 simply put it in your input dictionary for the model.

What is the difference between

fvm::SuSp(((2.0/3.0)*C1_ - C3_)*alpha()*rho()*divU, epsilon_)

and

fvm::SuSp(((2.0/3.0)*C1_ - C3_)*alpha()*rho()*divU, epsilon_)

atulkjoy

2018-08-09 19:48

reporter  

kEpsilon.C (7,470 bytes)

henry

2018-08-09 19:58

manager   ~0009940

I don't see the problem with this statement or the difference between it and the apparently identical form you provided. What exactly is the problem and what do you want changed to what and why?

henry

2018-08-09 22:10

manager   ~0009943

It is not clear what changed is being proposed in this report.

Issue History

Date Modified Username Field Change
2018-08-09 19:18 atulkjoy New Issue
2018-08-09 19:25 henry Note Added: 0009938
2018-08-09 19:48 atulkjoy File Added: kEpsilon.C
2018-08-09 19:58 henry Note Added: 0009940
2018-08-09 22:10 henry Assigned To => henry
2018-08-09 22:10 henry Status new => closed
2018-08-09 22:10 henry Resolution open => no change required
2018-08-09 22:10 henry Note Added: 0009943