Grid softwares for VOF simulations
Dear OF-users,
I am trying to compute VOF simulations around ships using the rasInterFoam solver. I have used the main settings of E. Patterson (wigley hull) with another geometry. But the case is crashing after a few iterations, maybe due to the quality of the mesh. I use ICEMCFD Hexa for grid generation. I was wondering what other grid softwares are used by the other users of OF (for complex geometries like cars, aircrafts and ships) ? All comments about grid softwares and how to set-up VOF simulations around ships are welcome. Regards, Stephane. |
The general purpose meshing to
The general purpose meshing tool shipped with OPENFOAM 1.5 is snappyHexMesh.
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Hi Eugene,
do you know a tu
Hi Eugene,
do you know a tutorial for snappyHexMesh with complex geometry ? Stephane |
Hello Stephane,
I'm working
Hello Stephane,
I'm working on the same type of computations. I also experienced that the solver crashed with the wigley tutorial settings on a realistic hull. I had to change the scheme to more upwind weighting. I got convergence with the following settings. divSchemes { div(rho*phi,U) Gauss upwind; div(phi,gamma) Gauss upwind; div(phirb,gamma) Gauss interfaceCompression; div(phi,k) Gauss upwind; div(phi,epsilon) Gauss upwind; div(phi,R) Gauss upwind; div(R) Gauss linear; div(phi,nuTilda) Gauss upwind; div((nuEff*dev(grad(U).T()))) Gauss linear; } laplacianSchemes { default Gauss linear corrected limited 0.5; } I have not yet compared the computed drag with my own CFD solver, so I don't know if it gives to mush diffusion to the solution. Anders |
Hi Anders,
Thanks. I will t
Hi Anders,
Thanks. I will try your settings and give you a feedback asap. Which software do you use for mesh generation ? Have you tried snappyHexMesh ? Stephane. |
Stephane,
I use an in-house
Stephane,
I use an in-house gridgenerator where I have developed an efficient parametric template for ship hulls. However I have not yet succeeded in converting meshes from our format to the OpenFOAM grid format (work in progress...). The only ship hull I have yet computed in OpenFOAM was generated by the StarCCM+ software. I have not yet had time to look in to the snappyHexMesh utility. Anders |
Hi Stephane,
On our side we
Hi Stephane,
On our side we use GridPro to create meshes around ships and planes. We created a converter from GridPro to OpenFOAM which is available on the forum and works for a large band of cases (still needs some code implementation for periodic boundary conditions). I did not make computations on ships but some clients did. If you want some other information, do not hesitate to contact me. Hope that helped. Regards |
Dear Anders, dear Vincent,
Dear Anders, dear Vincent,
GridPro are among the best grid softwares with ICEM and Gridgen. I am a new user of OpenFOAM. And maybe beginning with free surface computations is not the simplest thing. I have done meshes around ship with ICEM hexa. The quality seems good, but the computation crashes after some iterations. I have download the mesh of E. Patterson (wigley hull) and his settings. The case runs well. Just changing the geometry make the case crashes after less than 10 iterations. Stephane. |
Hi Stephane,
I don't know i
Hi Stephane,
I don't know if your geometry is very confidential. But if it's not, i can give it a look and try to do a mesh so you can try a different mesh generator and see if it's coming from that or not. If you want, just send me an email, so we can arrange everything. Vincent |
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