- **OpenFOAM Running, Solving & CFD**
(*https://www.cfd-online.com/Forums/openfoam-solving/*)

- - **QUICK Scheme**
(*https://www.cfd-online.com/Forums/openfoam-solving/70835-quick-scheme.html*)

QUICK SchemeHi Foamers,
I am using the LES solver to solve a variable density problem, which is of course not compressible. Anyway, the point is that when I use the following gradient scheme, I get an error of "segmentation fault": gradSchemes { default Gauss QUICK phi; grad(p) Gauss QUICK phi; grad(U) Gauss QUICK phi; } Anybody knows what the problem is? Any help would be appreciated. Maani |

Hi
The error output would be very helpful. And maybe a better description of the physical problem you are solving. |

Case under studyQuote:
Thanks for the reply. The case is that of a density current, in which a fluid of a higher density is released under an another low density fluid. The difference between their densities creates a shear layer between them and this results in a turbulent flow in common interface. I am using the LES solver (dynamic smagorinsky) plu vanDriest delta, and I have added a code to solve for the variable density there. When I choose the QUICK scheme for the gradient, before the first time step, the code gives: ... Time=0.01 segmentation fault and that's all. You might want to try it yourself!? Any help would be appropriated of course. Yous sincerely, Maani |

A thingWell, I forgot to ask but it would be great if you could give me an idea about the following parameters: 1) max cell expansion ratio in B.L. 2) max cell aspect ratio 3) max Courant number
Yours sincerely, Mani |

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