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Smoothing of IDDES delta

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Old   July 15, 2013, 11:53
Default Smoothing of IDDES delta
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Marian Fuchs
Join Date: Dec 2010
Location: Berlin, Germany
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Dear OpenFOAM users,

I am trying to test IDDES models for snappyHexMesh grids including 2:1 jumps in cell size in OpenFOAM-2.2.0. For this reason, I'd like to test the smoothing option for the delta used by the IDDES model. For DES97 and DDES, this works just fine, where delta is defined in LESProperties, e.g.:

#----
delta smooth;
smoothCoeffs
{
delta maxDeltaxyz;
maxDeltaxyzCoeffs
{
deltaCoeff 2;
}
maxDeltaRatio 1.2;
}
#----

I tried to convert the syntax for the IDDES delta as follows:

#----
IDDESmodelCoeffs
{
delta smooth;
smoothCoeffs
{
delta IDDESDelta;
IDDESDeltaCoeffs
{
cw 0.15;
deltaCoeff 1;
}
maxDeltaRatio 1.2;
}

cdt1 8;
}

delta maxDeltaxyz;
maxDeltaxyzCoeffs
{
deltaCoeff 2;
}
#----

Unfortunately, this leads to an infinite loop when I start my computation. Here is an excerpt of my log file:


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 80

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type LESModel
Selecting LES turbulence model IDDESmodel
Selecting LES delta type smooth
Selecting LES delta type maxDeltaxyz
IDDESmodelCoeffs
{
delta smooth;
smoothCoeffs
{
delta IDDESDelta;
IDDESDeltaCoeffs
{
cw 0.15;
deltaCoeff 1;
}
maxDeltaRatio 1.2;
}
}

Selecting LES delta type smooth
Selecting LES delta type maxDeltaxyz
Selecting LES delta type smooth
Selecting LES delta type IDDESDelta
Selecting LES delta type smooth
Selecting LES delta type IDDESDelta
Selecting LES delta type smooth
Selecting LES delta type IDDESDelta
Selecting LES delta type smooth


Maybe someone of you has already stumbled about this problem and can share his experience/the correct delta smoothing settings in this thread.

Thanks in advance,
Marian
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