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On the domain geometry dependence of the LBB condition

Published online by Cambridge University Press:  15 April 2002

Evgenii V. Chizhonkov  and
Maxim A. Olshanskii
Evgenii V. Chizhonkov
Affiliation:
Dept. Mechanics and Mathematics, Moscow State University, Moscow 119899, Russia. (chizhonk@mech.math.msu.su)
Maxim A. Olshanskii
Affiliation:
Dept. Mechanics and Mathematics, Moscow State University, Moscow 119899, Russia. (ay@olshan.msk.ru)
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Abstract

The LBB condition is well-known to guarantee the stability of a finiteelement (FE) velocity - pressure pair in incompressible flow calculations.To ensure the condition to be satisfied a certain constant should be positive andmesh-independent. The paper studies the dependence of the LBB condition on thedomain geometry. For model domains such as strips and rings thesubstantial dependence of this constant on geometry aspect ratios is observed.In domains with highly anisotropic substructures this may require special care with numerics to avoid failures similar to those whenthe LBB condition is violated. In the core of the paperwe prove that for any FE velocity-pressure pair satisfying usual approximationhypotheses the mesh-independent limit in the LBB condition is not greater thanits continuous counterpart, the constant from the Nečas inequality.For the latter the explicit and asymptotically accurate estimates are proved. The analytic results are illustrated by several numerical experiments.

Keywords

LBBinfsup conditionStokes problemdomain geometryeigenvalue problemfinite elements.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 34 , Issue 5 , September 2000 , pp. 935 - 951
Copyright
© EDP Sciences, SMAI, 2000

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