interFoam inviscid and rotational

pablodecastillo · January 28, 2011, 14:51

Hello,

Is it possible run interFoam inviscid but rotational (euler equations)?

Thanks

daveatstyacht · January 28, 2011, 15:15

Consider using "twoPhaseEulerFoam". I have never used it myself other than running the tutorials for it, but it might be what you are looking for. I am interested in the use of it, but I need a dynamic mesh version of it for it to be useful for my purposes. There are a couple of tutorials that use it so you can probably look at the files for those to figure out the setup.

pablodecastillo · January 28, 2011, 15:48

and what about to delete from interFoam scheme turbulence/viscous effects?. It is nonsense or i can try this weekend?

daveatstyacht · January 28, 2011, 18:56

I suspect that it isn't as straight forward as setting the viscosity to zero since you have to contend with the effective viscosity of the turbulence model. I don't believe interFoam runs without the ras settings used. I don't believe it will cut your computation times down unless you can remove the turbulence parts of interFoam which would require altering the interFoam solver itself to eliminate the Reynolds stress term and if you are doing that you might as well remove the viscosity term too. You might be able to get it to run using the dummy turbulence model "laminar", but I think it would be easier to try the twoPhaseEulerFoam since it is a volume of fraction solver like interfoam, but it is solving the Euler equations instead of the full RANS. It comes in the standard 1.7.1 version and setting up the run should be straight forward.

pablodecastillo · January 29, 2011, 05:11

My idea is build a new solver based in interFoam, so it is delete diffusive terms from UEqn.h and turbulence->correct(); from interFoam.

UEqn will be like;

fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(rhoPhi, U)
);

pablodecastillo · January 31, 2011, 07:54

Hi Dave,

Now i have the inviscid working in multiphase, so it is more easy to see the influence of compression interface, momentumPredictor, corrections etc.... in the accurate and speed results.
I want to implement trim&sink function, do you known if shipFoam is based in move the whole domain or mesh deformation?

Betsy · June 15, 2012, 18:42

HI Pablo - Have you had success with your new inviscid solver? I am thinking of doing the same thing so I can solver two-phase Euler eqns.
Betsy

pablodecastillo · June 16, 2012, 08:15

Yes, inviscid euler is pretty easy to implement, just remove the viscous terms from equations and turbulence.

January 28, 2011, 14:51	interFoam inviscid and rotational	#1
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	Hello, Is it possible run interFoam inviscid but rotational (euler equations)? Thanks

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January 28, 2011, 15:15		#2
daveatstyacht Senior Member Dave Join Date: Jul 2010 Posts: 100 Rep Power: 15	Consider using "twoPhaseEulerFoam". I have never used it myself other than running the tutorials for it, but it might be what you are looking for. I am interested in the use of it, but I need a dynamic mesh version of it for it to be useful for my purposes. There are a couple of tutorials that use it so you can probably look at the files for those to figure out the setup.

January 28, 2011, 15:48		#3
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	and what about to delete from interFoam scheme turbulence/viscous effects?. It is nonsense or i can try this weekend?

January 28, 2011, 18:56		#4
daveatstyacht Senior Member Dave Join Date: Jul 2010 Posts: 100 Rep Power: 15	I suspect that it isn't as straight forward as setting the viscosity to zero since you have to contend with the effective viscosity of the turbulence model. I don't believe interFoam runs without the ras settings used. I don't believe it will cut your computation times down unless you can remove the turbulence parts of interFoam which would require altering the interFoam solver itself to eliminate the Reynolds stress term and if you are doing that you might as well remove the viscosity term too. You might be able to get it to run using the dummy turbulence model "laminar", but I think it would be easier to try the twoPhaseEulerFoam since it is a volume of fraction solver like interfoam, but it is solving the Euler equations instead of the full RANS. It comes in the standard 1.7.1 version and setting up the run should be straight forward.

January 29, 2011, 05:11		#5
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	My idea is build a new solver based in interFoam, so it is delete diffusive terms from UEqn.h and turbulence->correct(); from interFoam. UEqn will be like; fvVectorMatrix UEqn ( fvm::ddt(rho, U) + fvm::div(rhoPhi, U) );

January 31, 2011, 07:54		#6
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	Hi Dave, Now i have the inviscid working in multiphase, so it is more easy to see the influence of compression interface, momentumPredictor, corrections etc.... in the accurate and speed results. I want to implement trim&sink function, do you known if shipFoam is based in move the whole domain or mesh deformation?

June 15, 2012, 18:42		#7
Betsy New Member Betsy Seiffert Join Date: Feb 2011 Location: Honolulu, HI Posts: 11 Rep Power: 15	HI Pablo - Have you had success with your new inviscid solver? I am thinking of doing the same thing so I can solver two-phase Euler eqns. Betsy

June 16, 2012, 08:15		#8
pablodecastillo Senior Member Pablo Join Date: Mar 2009 Posts: 102 Rep Power: 17	Yes, inviscid euler is pretty easy to implement, just remove the viscous terms from equations and turbulence.