The approximate Riemann solver proposed by Harten Lax and van Leer (HLL) in 1983 requires estimates for the fastest signal velocities emerging from the initial discontinuity at the interface, resulting in a two–wave model for the structure of the exact solution. A more accurate method is the HLLC, introduced by Toro and collaborators in 1992. This method assumes a three–wave model, resulting in better resolution of intermediate waves.
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© 2009 Springer-Verlag Berlin Heidelberg
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Toro, E.F. (2009). The HLL and HLLC Riemann Solvers. In: Riemann Solvers and Numerical Methods for Fluid Dynamics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b79761_10
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DOI: https://doi.org/10.1007/b79761_10
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