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Old   August 13, 2007, 17:33
Default Hi everyone, I trying to ru
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Joseph F Slomski
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Location: West Bethesda, MD, USA
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Hi everyone,

I trying to run an LES using oodles, with initial conditions mapped from a steady RANS solution gotten from simpleFoam. When I execute oodles, I get a curious error where oodles complains about "different dimensions". I've checked all of my object files to be sure I've got the dimensions OK, and couldn't find any mistakes there. (B/t/w, I'm trying to use the dynamic Smagorinsky SGS.) Part of the error message follows.

"Create mesh, no clear-out for time = 0

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Creating field Umean

Creating field R

Creating field Bmean

Creating field epsilonMean

Creating field pMean

Creating field pPrime2Mean

Starting time loop

Time = 5e-07

Courant Number mean: 0.00687179 max: 2.76796
[1] --> FOAM FATAL ERROR : Different dimensions for =
dimensions : [0 2 -1 0 0 0 0] = [0 1 0 0 0 0 0]
#0 Foam::error::printStack(Foam:stream&)
#1 Foam::error::abort()
#2 Foam::dimensionSet::operator=(Foam::dimensionSet const&) const
#3 Foam::GeometricField<double,>::operator=(Foam::tmp <foam::geometricfield<double,> > const&)
#4 Foam::LESmodels::dynSmagorinsky::correct(Foam::tmp <foam::geometricfield<foam::te nsor<double>, Foam::fvPatchField, Foam::volMesh> > const&)
#5 Foam::LESmodel::correct()
#6 main
#7 __libc_start_main
#8 __gxx_personality_v0 at ../sysdeps/x86_64/elf/start.S:116
[1] From function dimensionSet::operator=(const dimensionSet& ds) const
[1] in file dimensionSet/dimensionSet.C at line 156.
FOAM parallel run aborting..."

Any thoughts on what this is? I'm a VERY new Foam user, so not so much in Foam is obvious to me just yet ;)

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Old   August 13, 2007, 18:22
Default Hi Joe, this message means re
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Hi Joe,
this message means really that some value is defined differently in your boundary conditions files and in the programm.
Have you checked the boundary files, whose dimension corresponds to [0 2 -1 0 0 0 0] ?
It could help for finding the bug, or at least which equation is concerned.
There is maybe an equation adimensionned by the velocity.
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Old   August 14, 2007, 10:17
Default OK, that points me in the righ
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Joseph F Slomski
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OK, that points me in the right direction. I suspect my problem arises because I've mapped an incompressible RANS field, based on the k-w SST closure, into what I hope to be an incompressible LES field, based on the dynamic Smagorinsky sgs model.

In the RANS field, I specified BC files (and schemes/solvers) for k, nuTilda, omega, p, R, and U. For the LES field, I'm specifying BC files (and schemes/solvers) for B, k, nuSgs, nuTilda, p, and U.

So it would appear that the LES solver is looking for two fields with dimensions (0 2 -1 0 0 0 0), i.e., nuSgs and nuTilda, whereas the field mapped from the RANS solution only had one variable with that dimension, namely nuTilda.

So I think my question now is, how do I map the RANS field to the LES case while ensuring that the LES solver is getting the field it's looking for?

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