Reduced basis approximation and a posteriori error estimation for the time-dependent viscous Burgers’ equation
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- Nguyen, NC., Rozza, G. & Patera, A.T. Calcolo (2009) 46: 157. doi:10.1007/s10092-009-0005-x
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In this paper we present rigorous a posterioriL2 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 ν−1≫1; we present numerical results for a (stationary) steepening front for T=2 and 1≤ν−1≤200.