B. Düring, P. Fuchs, A. Jüngel:

"A higher-order gradient flow scheme for a singular one-dimensional diffusion equation";

in: "ASC Report 30/2015", issued by: Institute for Analysis and Scientific Computing; Vienna University of Technology, Wien, 2015, ISBN: 978-3-902627-08-7, 1 - 24.

A nonlinear diffusion equation, interpreted as a Wasserstein gradient ﬂow, is numerically solved in one space dimension using a higher-order minimizing movement scheme based on the BDF (backward diﬀerentiation formula) discretization. In each time step, the approximation is obtained as the solution of a constrained quadratic minimization problem on a ﬁnite-dimensional space consisting of piecewise quadratic basis functions. The numerical scheme conserves the mass and dissipates the G-norm of the two-step BDF time approximation. Numerically, also the discrete entropy and variance are decaying. The decay turns out to be exponential in all cases. The corresponding decay rates are computed numerically for various grid numbers.

Super-fast diffsion equation, Wasserstein gradient ﬂow, minimizing move-ments, higher-order scheme, G-norm.

http://www.asc.tuwien.ac.at/preprint/2015/asc30x2015.pdf

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