POD-Galerkin reduced order methods for CFD using Finite Volume Discretisation: vortex shedding around a circular cylinder

Giovanni Stabile 1 , Saddam Hijazi 2 , Andrea Mola 2 , Stefano Lorenzi 3 ,  and Gianluigi Rozza 2
  • 1 SISSA, International School for Advanced Studies, Mathematics Area, mathLab , Trieste, Italy
  • 2 SISSA, International School for Advanced Studies, Mathematics Area, mathLab , Trieste, Italy
  • 3 Department of Energy, Politecnico di , Milano, Italy


Vortex shedding around circular cylinders is a well known and studied phenomenon that appears in many engineering fields. A Reduced Order Model (ROM) of the incompressible ow around a circular cylinder is presented in this work. The ROM is built performing a Galerkin projection of the governing equations onto a lower dimensional space. The reduced basis space is generated using a Proper Orthogonal Decomposition (POD) approach. In particular the focus is into (i) the correct reproduction of the pres- sure field, that in case of the vortex shedding phenomenon, is of primary importance for the calculation of the drag and lift coefficients; (ii) the projection of the Governing equations (momentum equation and Poisson equation for pressure) performed onto different reduced basis space for velocity and pressure, respectively; (iii) all the relevant modifications necessary to adapt standard finite element POD-Galerkin methods to a finite volume framework. The accuracy of the reduced order model is assessed against full order results.

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