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Viscoelastic Fluid Flows using OpenFOAM The solver viscoelasticFluidFoam

Posted May 12, 2017 at 13:49 by kindle
More about the solver

there is someone asking "does this solver work with K-Epsilon? in other words can I solve a turbulent viscoelastic flow by the means of this solver?"

Quote:
Originally Posted by jovani View Post
Hello Foamers,

My name is Jovani and I want announce that will soon be available a solver for treatment of viscoelastic fluid in OpenFOAM. I was working in the development of a viscoelasticFluidFoam solver (with the great orientation of the Dr. Hrvoje Jasak, thank you very much
...
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Posted in Solver
Views 827 Comments 0 kindle is offline Edit Tags
Old

viscoelasticFluidFoam for OpenFOAM-2.3.x

Posted March 31, 2017 at 12:54 by kindle
Compiles with OpenFOAM-2.3.x
Benchmark test to do. Usage to be learned

Quote:
Originally Posted by jovani View Post
Hello dear Sita,

There is an old post where you find some hints about transient simulation using the viscoelasticFluidFoam solver:
http://www.cfd-online.com/Forums/ope...fluidfoam.html

To turn off the stabilising technique used in the solver go to the main file of the viscoelastc model you want and do the etaPEff = 0 in the divTau() funtion or take out the
...
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Posted in Solver, Viscoelastic
Views 648 Comments 0 kindle is offline Edit Tags
Old

PBiCG VS smoothsolver

Posted March 31, 2017 at 12:51 by kindle
Updated May 11, 2017 at 10:21 by kindle (OF-4.x and Foam-extend have implemented this solver)
Namings of libraries are different in OpenFOAM and foam-extend. Well. BiCGStab is needed in U solver of viscoelasticFluidFoam

And this PBiCGStab is implemented also in the OF-4.x and foam-extend (go downstairs from the post). More specifically in OF-4.x it is added (https://github.com/OpenFOAM/OpenFOAM-4.x/commit/1ca4bbf1d288075a76940d58fdf61cbfc49298ee) and in foam-extend it is modified (https://github.com/OpenFOAM/OpenFOAM-dev/commit/c339d3018c98cb67c3455ab09db316c7c0618d5c).
...
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Posted in Solver, Viscoelastic
Views 924 Comments 0 kindle is offline Edit Tags
Old

"Residuals" in residualControl

Posted December 4, 2016 at 18:54 by kindle
PimpleFoam hahhahhhahha

Quote:
Originally Posted by knuckles View Post
In system/fvSolution, I can specify tolerances on matrix solvers:

Code:
solvers
{
    p
    {
        solver         PGC;
        preconditioner DIC;
        tolerance      1e-08;
        relTol         0;
    }
}
My understanding is that openfoam will construct an equation of the form Ax = b, solve it in some iterative way, and will stop iterating when the residual, |Ax
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Posted in Solver
Views 678 Comments 0 kindle is offline Edit Tags
Old

pimpleFoam vs simpleFoam vs pisoFoam vs icoFoam?

Posted October 14, 2016 at 12:27 by kindle
Updated October 24, 2016 at 12:37 by kindle
Quite confusing sometime !

But, why is that a problem needs boundary condition for U and p and all the other possible variables?

pisoFoam has relaxation coef while icoFoam does not have this.
Quote:
UEqn.relax();

Quote:
Originally Posted by ata View Post
Hi
icoFoam is transient solver for incompressible, laminar flow of Newtonian fluids.

pimpleFoam is large time-step transient solver for incompressible, flow using the PIMPLE(merged PISO-SIMPLE) algorithm.
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Posted in Solver
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