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arXiv · 1511.08072

Unconditional long-time stability of a velocity-vorticity method for the 2D Navier-Stokes equations

Timo Heister·Maxim A. Olshanskii·Leo G. Rebholz
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Abstract

We prove unconditional long-time stability for a particular velocity-vorticity discretization of the 2D Navier-Stokes equations. The scheme begins with a formulation that uses the Lamb vector to couple the usual velocity-pressure system to the vorticity dynamics equation, and then discretizes with the finite element method in space and implicit-explicit BDF2 in time, with the vorticity equation decoupling at each time step. We prove the method's vorticity and velocity are both long-time stable in the $L^2$ and $H^1$ norms, without any timestep restriction. Moreover, our analysis avoids the use of Gronwall-type estimates, which leads us to stability bounds with only polynomial (instead of exponential) dependence on the Reynolds number. Numerical experiments are given that demonstrate the effectiveness of the method.

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Timo Heister, Maxim A. Olshanskii, Leo G. Rebholz. 2015-11-25. Unconditional long-time stability of a velocity-vorticity method for the 2D Navier-Stokes equations. https://arxiv.org/abs/1511.08072

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