Estudo de fluxos numéricos para modelos magneto-hidrodinâmicos utilizando o código Flash

• Autor(a) principal: Dias, Paulo Henrique da Silva Vasconcellos
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13812
• topic: Magnetohydrodynamics; Finite volume method; Flash; Numerical flows; Riemann problem; Magnetoidrodinamica - Métodos de simulação; Magnetoidrodinamica - Modelos matemáticos; Método dos volumes finitos; Flash (Programa de computador); Magneto-hidrodinâmica; Fluxos numéricos; Problema de Riemann; CNPQ::CIENCIAS EXATAS E DA TERRA::MATEMATICA::MATEMATICA APLICADA

The magnetohydrodynamic theory allows the structuring of computational models, designated as MHD models, which are an extension of fluid dynamics to deal with electrically charged fluids such as plasmas, where one needs to consider the effect of electromagnetic forces. Such models are specially useful when the exact motion of a particle is not of interest. In it, the equations describe the evolution of macroscopic quantities. Various forms of MHD models have been widely used in the Space Physics to describe many different types of plasma phenomena such as magnetic reconnection and interaction of stellar winds with different celestial bodies. In this work, the goal is to analyze the behavior of several numerical flows in a finite volume discretization of a numerical MHD model using an unsplit staggered mesh scheme considering some test cases. For the simulations, we use the Flash code, developed by the University of Chicago, as a code of broad interest in astrophysical simulations and phenomena in the space close to the Earth. The methodology consists in including a numerical flow, allowing improvements with respect to HLL scheme.