Hi,
I am running rasInterFo
Hi,
I am running rasInterFoam for a freesurface piercing NACA 0024 hydrofoil at Fr = 0.55. Overall, the solution looks quite good with nice resolution of the bow wave, the wave profile, and the spilling breaking wave. So, what's the issue? I've run both coarse (~0.3M cells) and fine (~2M cells) hex meshes, and have some nonphysical small amplitude waves in the gamma field which are seen on the gamma=0.5 isosurface (i.e., the free surface). Anyone have suggestions on fvSchemes settings to eliminate this problem? I am using standard rasInterFoam settings, // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default Euler; } gradSchemes { default Gauss linear; } divSchemes { div(rho*phi,U) Gauss upwind; div(phi,gamma) Gauss limitedLinear01 1; div(phirb,gamma) Gauss limitedLinear01 1; div(phi,k) Gauss upwind; div(phi,epsilon) Gauss upwind; div(phi,R) Gauss upwind; div(R) Gauss linear; div(phi,nuTilda) Gauss upwind; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; interpolate(HbyA) linear; } snGradSchemes { default corrected; } fluxRequired { default no; pd; pcorr; gamma; } // ************************************************** *********************** // To get an idea of what I am seeing, I've put a couple of animations (naca0024...) for download at: http://homepage.mac.com/egpaterson/FileSharing2.html Thanks, Eric 
Try:
div(phi,gamma) Gaus
Try:
div(phi,gamma) Gauss Gamma01 1; div(phirb,gamma) Gauss Gamma01 1; Hrv 
Hrv,
I tried the Gamma01 sc
Hrv,
I tried the Gamma01 scheme, although I did restart from the exisiting solution. However, it had no noticable impact. We'll have to do some more digging to understand this better. Eric 
Hi Eric
I have had the same
Hi Eric
I have had the same problems using interFoam. The only way I have found to eliminate the overshoots is to use div(rho*phi,U) Gauss upwind; div(phi,gamma) Gauss upwind; Regards /Joakim 
Hi Joakim,
Thanks, as you c
Hi Joakim,
Thanks, as you can see from the image which compares upwind vs. limitedLinear01 on gamma http://www.cfdonline.com/OpenFOAM_D...ges/1/4182.jpg, the upwind scheme took care of the problem as would be expected with a first order scheme. However, it also smoothed the diverging wave in the wake. I'm going to test out the other TVD schemes. Eric 
Here's the 3D view http://www.

Hello,
I am continuing to w
Hello,
I am continuing to work on this case. I would like to get a 2ndorder scheme working without the nonphysical waves that were smoothed out by upwind. Currently I am working with rasInterFoam, FR=0.55, coarse (~246,000 cell) grid. This is the same case Eric posted about above, all is the same except my fvSchemes dict which is below: // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default Euler; } gradSchemes { default Gauss linear; } divSchemes { div(rho*phi,U) Gauss MUSCL; div(phi,gamma) Gauss MUSCL; div(phirb,gamma) Gauss MUSCL; div(phi,k) Gauss upwind; div(phi,epsilon) Gauss upwind; div(phi,R) Gauss upwind; div(R) Gauss linear; div(phi,nuTilda) Gauss upwind; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; interpolate(HbyA) MUSCL; } snGradSchemes { default corrected; } fluxRequired { default no; pd; pcorr; gamma; } // ************************************************** *********************** // Has anyone had any experience/problems implementing MUSCL? I've run the following to attempt to get the solution started: (1) water/air density ratio: 1000:100 CFL=0.1 ran OK for 75 time steps (2) 1000:10 CFL=0.1 Did not work in that pcorr iterations were >5000 and/or deltaT was less than 1e33 or CFL greater than 1.0 (3) changed to CFL=0.05, 0.04, 0.03 crashed in a similar manner (4) changed the water/air density ratio to 1000:100 again and CFL=0.1: Runs OK! (5) changed density ratio to 1000:50 CFL=0.1 runs OK (6) changed density ratio to 1000:1 CFL=0.1, 0.05, 0.025, 0.0125, 0.00625 crashed as above My next thought is to try ratio of 1000:10. Any thoughts/comments/suggestions would be greatly appreciated. Thank you, Ryan Carley 
Have you tried OF1.4 with the
Have you tried OF1.4 with the MULES scheme for gamma yet?
You categorically cannot run Gamma with a scheme that is not strictly bounded between 0 and 1, e.g. MULES or gamma01 
Belay that, just check the OF1
Belay that, just check the OF1.4 tutorials for what schemes to use on gamma.

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