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UPA Perpustakaan Universitas Jember

Stability of a Kirchhoff–Roe scheme for two-dimensional linearized Euler systems

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By applying Helmholtz decomposition, the unknowns of a linearized Euler system can be recast as solutions of uncoupled linear wave equations. Accordingly, the Kirchhoff expression of the exact solutions is recast as a time-marching, Lax–Wendroff type, numerical scheme for which consistency with one-dimensional upwinding is checked. This discretization, involving spherical means, is set up on a 2D uniform Cartesian grid, so that the resulting numerical fluxes can be shown to be conservative Moreover, semi-discrete stability in the Hs norms and vorticity dissipation are established along with practical second-order accuracy Finally some relations with former “shape functions” and “symmetric potential schemes” are highlighted.

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