Reduced basis approximation and a posteriori error estimation for the time-dependent viscous Burgers equation

Abstract

In this paper we present rigorous a posteriori L 2 error bounds for reduced basis approximations of the unsteady viscous Burgers? equation in one space dimension. The a posteriori error estimator, derived from standard analysis of the error-residual equation, comprises two key ingredients?both of which admit efficient Offline-Online treatment. The first is a sum over timesteps of the square of the dual norm of the residual; the second is an accurate upper bound (computed by the Successive Constraint Method) for the exponential-in-time stability factor. These error bounds serve both Offline for construction of the reduced basis space by a new POD-Greedy procedure and Online for verification of fidelity. The a posteriori error bounds are practicable for final times (measured in convective units) T?O(1) and Reynolds numbers ? ?1?1; we present numerical results for a (stationary) steepening front for T=2 and 1?? ?1?200.