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Event Details

  • Tuesday, May 23, 2017
  • 16:20 - 16:50

Hierarchical Boltzmann Simulations and M(odel)-Refinement

Gas flow in thermal non-equilibrium can be described by kinetic theory and Boltzmann equation at the expense of strongly increased computational costs. A hierarchical simulation approach for Boltzman›s equation should provide a single numerical framework in which a coarse representation can be used to compute gas flows as accurate and efficient as in computational fluid dynamics (CFD), but a subsequent refinement allows to successively improve the result to the complete Boltzmann result. The hierarchical nature of the method can then be used to provide efficient model error estimates to increase the predictivity of a CFD computation. This talk will give a proof-of-concept approach for such a framework for the case of the steady linearized Boltzmann equation using Hermite discretization, that is, moment equations and an implicit discontinuous Galerkin formulation.