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Randomized Model Order Reduction

Singular value decomposition (SVD) has a crucial role in model order reduction. It is often utilized in the offline stage to compute basis functions that project the high-dimensional nonlinear problem into a low-dimensionsl model which is, then, evaluated cheaply. It constitutes a building block for many techniques such as e.g. Proper Orthogonal Decomposition and Dynamic Mode Decomposition. The aim of this work is to provide efficient computation of the basis functions via randomized matrix decompositions. This is possible due to the randomized Singular Value Decomposition (rSVD) which is a fast and accurate alternative of the SVD. Although this is considered as offline stage, this computation may be extremely expensive and therefore the use of compressed techniques drastically reduce its cost. Numerical examples show the effectiveness of the method for both Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD).