Guys,

when trying to simulate the flow around a blade of a water turbine, what do you thing would be more suitable, a structured or an unstructured mesh and why?

Thanks! Nikos

You need well shaped cells that have faces that are parallel and perpendicular to the blade suface. They need to follow the blade contours. Whether you do that with a structured or unstructured mesh is completely irrelevant.

What i did for a foil was creating a boundary layer that is perpendicular to the foil surface (about 20 layers; up to you)(ie. the boundary followed the shape of foil , they call it C grid) then outside the boundary layer, i made unstructured tringular mesh.then the further outside i used rectangular structured mesh. thats what my lecturer taught me.