Proper orthogonal decomposition (POD) is one of the most significant reduced-order modeling (ROM) techniques in fluid mechanics. However, the application of POD based reduced-order models (POD-ROMs) is primarily limited to laminar flows due to the decay of physical accuracy. A few nonlinear closure models have been developed for improving the accuracy and stability of the POD-ROMs, which are generally computationally expensive. In this paper we propose a new closure strategy for POD-ROMs that is both accurate and effective. In the new closure model, the Frobenius norm of the Jacobian of the POD-ROM is introduced as the eddy viscosity coefficient. As a first step, the new method has been tested on a one-dimensional Burgers equation with a small dissipation coefficient . Numerical results show that the Jacobian based closure model greatly improves the physical accuracy of the POD-ROM, while maintaining a low computational cost.
A New Closure Strategy for Proper Orthogonal Decomposition Reduced-Order Models
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Akhtar, I., Wang, Z., Borggaard, J., and Iliescu, T. (April 4, 2012). "A New Closure Strategy for Proper Orthogonal Decomposition Reduced-Order Models." ASME. J. Comput. Nonlinear Dynam. July 2012; 7(3): 034503. https://doi.org/10.1115/1.4005928
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