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Computational and Applied Mathematics Seminar: Alexander Kurganov, SUSTech, Central-Upwind Schemes with Reduced Numerical Dissipation
February 2 | 12:45 pm - 1:45 pm EST
Central-upwind schemes are Riemann-problem-solver-free Godunov-type finite-volume schemes, which are, in fact, non-oscillatory central schemes with a certain upwind flavor: derivation of the central-upwind numerical fluxes is based on the one-sided local speeds of propagation, which can be estimated using the largest and smallest eigenvalues of the Jacobian.
I will introduce two new classes of central-upwind schemes with reduced numerical dissipation. First, we will use a subcell resolution at the projection step to enhance the resolution of contact waves, which are typically badly affected by excessive numerical dissipation present in numerical methods. The second approach is based on the utilization of the local characteristic decomposition for the modification of the numerical diffusion of the central-upwind schemes. Both approaches help to significantly reduce the amount of numerical dissipation present in central-upwind schemes without risking large spurious oscillation. Applications to several hyperbolic systems of conservation laws will be discussed.