[spl]

Hi guys

I am currently meshing a radial turbine stage (wheel, volute and outlet) in ICEM. I follow what i believe is the correct steps to achieve a good mesh (from Simon Pereira's Tips and Tricks presentation). However after the mesh is complete the min angle is less than 9deg and the mesh expansion factor is very high. Smoothing the mesh further only makes this worse and trying to adjust each cell by hand isn't an option as there are 10,000 cells with min angles less than 9deg. These 10,000 cells only make up about 0.05% of the mesh though.

So my question is are bad cells acceptable if their overall percentage is kept so low? Or has anyone got experience in meshing radial turbines in ICEM and know how to avoid these issues? The worse areas tend to be between the blade edge and shroud. The solver that will be used is CFX.

Also if anyone knows of any papers/studies completed on the comparison of mesh generation between ICEM, TurboGrid, AutoMesh and any other meshing software for radial turbines it would be very useful.

Thanks