Workshop - Problèmes mathématiques et modélisation en théorie cinétique

Frédérique Charles

Analysis of a Linearly Transformed Particle method.

Particle methods are widely used for numerical resolution of transport equations, particularely in the framework of kinetic equations. Conceptually simple and relatively easy to implement, classical particle methods have the main drawback to often produce noisy solutions. The idea of the Linearly Transformed Particle method, developped by M. Campos-Pinto following a idea of A. Cohen et B. Perthame (2000), is to transform the shape functions of particles in order to follow the local variation of the flot. This method has been adapted and analysed for the Vlasov-Poisson system and for a compressible gradient-flow equation (work in collaboration with M. Campos-Pinto, J-A. Carrillo, Y-P Choi). In both cases the error estimate is improved compared to classical particle methods, with the obtention of a strong convergence of the approached solution.




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