Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 172, Issue 2, Pages 401-425Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcph.2001.6769
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We present a new Neumann subproblem a posteriori finite-element procedure for the efficient calculation of rigorous, constant-free, sharp lower and upper bounds for linear and nonlinear functional outputs of the incompressible Navier-Stokes equations. We first formulate the bound procedure; we derive and discuss a bound error expression; and we then demonstrate the capabilities of the method with numerical results obtained for natural convection problems. We also implement an optimal adaptive refinement strategy based on a local elemental decomposition of the bound gap. (C) 2001 Academic Press.
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