Flexible and efficient discretizations of multilayer models with variable density

49/2020

Flexible and efficient discretizations of multilayer models with variable density

Thursday 23rd July 2020

Bonaventura,L.; Garres Diaz,J.

We show that the semi-implicit time discretization approaches previously introduced for multilayer shallow water models for the barotropic case can be also applied to the variable density case with Boussinesq approximation. Furthermore, also for the variable density equations, a variable number of layers can be used, so as to achieve greater flexibility and efficiency of the resulting multilayer approach. An analysis of the linearized system is presented, which allows to de- rive linear stability parameters the resulting spatially semi-discretized equations. A number of numerical experiments demonstrate the effectiveness of the proposed approach.