open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi all,

Can someone describe in few words how tracers are implemented numerically, precisely:
1. Which FEM is used (basis functions, stabilization method such as SUPG etc.)
2. What is used for time integration?
3. Any other special treatments?

Regards,
Mike

Hello,

Basically the finite element is linear. For tracers you have a number of options but if you stick to mass conservative and monotonous methods we use distributive schemes like N or PSI, with specific adaptations like the NERD scheme to cope with dry zones. The last version 7.1 has new distributive schemes with very low artificial diffusion. We have also finite volume schemes like HLLC or kinetic schemes.

With best regards,

Jean-Michel Hervouet

And why did you choose distributive schemes, but not SUPG one?

Hello,

SUPG does not guarantee monotonicity, and gives non symetric matrices, so we prefer distributive schemes, the more so because there are new algorithms in release 7.1, with much less diffusion, and others to come in the next release.

With best regards,

Jean-Michel Hervouet