CE-Seminar: Towards pressure-robust mixed methods for the incompressible Navier-Stokes equations

Start date:20. July 2017
Start time:17:00 Uhr
End time:17:45 Uhr
Organizer:Graduate School of Computational Engineering
Speaker:Dr. Alexander Linke from the Weierstrass Institute for Applied Analysis and Stochastics in Berlin
Location:S4 10|1
Description:

For more than thirty years it was thought that the efficient construction of pressure-robust mixed methods for the incompressible Navier-Stokes equations, whose velocity error is pressure-independent, was practically impossible. However, a novel, quite universal construction approach shows that it is indeed rather easy to construct pressure-robust mixed methods. The approach repairs a certain (L2-)orthogonality between gradient fields and discretely divergence-free test functions, and works for families of arbitrary-order mixed finite element methods, arbitrary-order discontinuous Galerkin methods, and finite volume methods. Novel benchmarks for the incompressible Navier-Stokes equations show that the approach promises significant speedups in computational practice, whenever the continuous pressure is complicated.



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