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-   -   Can anyone give me a introduction of the rhoPimpleFoam solvers? (http://www.cfd-online.com/Forums/openfoam/110861-can-anyone-give-me-introduction-rhopimplefoam-solvers.html)

Sunxing December 22, 2012 21:37

Can anyone give me a introduction of the rhoPimpleFoam solvers?
 
Hi foamers,

My tutor asked me to simulate a case using the rhoPimpleFoam solver. However, I am not familiar with it. What's more, I don't know what the LES oneEqEddy model exactly is. Can anyone help me to give me some hints?

Bests,
Sunxing

fumiya December 23, 2012 06:41

Hi,

The rhoPimpleFoam is transient solver for laminar or turbulent flow of
compressible fluids using the flexible PIMPLE (PISO-SIMPLE) algorithm.

The oneEqEddy model is one of the LES turbulence models implemented
in OpenFOAM and you can find the related information in the following
document:
http://www.tfd.chalmers.se/~hani/kur...jectReport.pdf

Best regards,
fumiya

Sunxing December 23, 2012 07:12

Quote:

Originally Posted by fumiya (Post 398761)
Hi,

The rhoPimpleFoam is transient solver for laminar or turbulent flow of
compressible fluids using the flexible PIMPLE (PISO-SIMPLE) algorithm.

The oneEqEddy model is one of the LES turbulence models implemented
in OpenFOAM and you can find the related information in the following
document:
http://www.tfd.chalmers.se/~hani/kur...jectReport.pdf

Best regards,
fumiya


Hi fumiya,

Thanks for your reply. And it is very helpful for me.

Regards
Sunxing

Sunxing March 15, 2013 03:43

2 Attachment(s)
Hi Funiya,

First thank you for your anser my thread. Now I have a new problem, that you may know how to deal with. I have simulated a 2D flot film cooling case using pisoFoam(modified by adding temperature) instead of rhoPimpleFoam(my tutor suggested to use this solver, however the inlet velocity was quite low, so I didn't choose it). Then I performed the case with three different models: Launder Shama k-εmodel(RANS), Smagorinsky model(LES) and k-equation eddy-viscosity model(LES).
After analysing the reslut, I find two problem:
1, the temperature filed doesn't have an aggrement with the experimential data. For this point I want to know what leads to this.
2, I have a good result with the RNAS model in velocity and pressure. However the reslut using LES models is bad in velocity, especially that the velocity in the boundary layer is quite low than that of the experimental data.
So can you give me some suggestions?

This the code that I modify the pisoFoam
Code:

//add these lines...
        fvScalarMatrix TEqn
        (
            fvm::ddt(T)
            + fvm::div(phi, T)
            - fvm::laplacian(DT, T)
        );

        TEqn.solve();
//done adding lines...



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