open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,
Could you please tell me what is the acceptable skewness of the grid cells in Telemac?
I read here:http://en.wikipedia.org/wiki/Types_of_mesh
that for Triangular cells, skewness should not exceed 0.85.
Is it a correct value for Telemac? Or should max skewness be lower than this?

Thank you in advance.
Best regards,
Tatiana

Hello,

We have no such limitation as 0.85, e.g. in rivers you could have elongated elements in the direction of the flow, and the Courant number in all directions could remain about the same. One recommendation is to avoid obtuse angles: it is known that a diffusion matrix may become antidiffusion on an obtuse angle. Though we care for this it gives a hint that obtuse angles in a triangle are weird.

Generally speaking I wil say that the quality will be the same everywhere if you have the same Courant number everywhere, hence for maritime applications a mesh size proportional to the square root of the depth.

With best regards,

Jean-Michel Hervouet