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Type: Report × Subject: finite volume scheme ×

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    Convergence of a finite volume scheme for the biharmonic problem
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2010) Eymard, Robert; Gallou¨et, T.; Herbin, R.; Linke, A.
    We propose a finite volume scheme for the approximation of a biharmonic problem with Dirichlet boundary conditions. We prove that the piece-wise constant approximate solution converges to the exact solution, as well as the discrete approximate of the gradient and the discrete approximate of the Laplacian of the exact solution. These results are confirmed by numerical results.
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    Comparison of thermodynamically consistent charge carrier flux discretizations for Fermi-Dirac and Gauss-Fermi statistics
    (Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2017) Farrell, Patricio; Patriarca, Matteo; Fuhrmann, Jürgen; Koprucki, Thomas
    We compare three thermodynamically consistent ScharfetterGummel schemes for different distribution functions for the carrier densities, including the FermiDirac integral of order 1/2 and the GaussFermi integral. The most accurate (but unfortunately also most costly) generalized ScharfetterGummel scheme requires the solution of an integral equation. We propose a new method to solve this integral equation numerically based on Gauss quadrature and Newtons method. We discuss the quality of this approximation and plot the resulting currents for FermiDirac and GaussFermi statistics. Finally, by comparing two modified (diffusion-enhanced and inverse activity based) ScharfetterGummel schemes with the more accurate generalized scheme, we show that the diffusion-enhanced ansatz leads to considerably lower flux errors, confirming previous results (J. Comp. Phys. 346:497-513, 2017).