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Numerical solution of parametrized Navier-Stokes equations by reduced basis methods. (English) Zbl 1178.76238
Summary: We apply the reduced basis method to solve Navier-Stokes equations in parametrized domains. Special attention is devoted to the treatment of the parametrized nonlinear transport term in the reduced basis framework, including the case of nonaffine parametric dependence that is treated by an empirical interpolation method. This method features (i) a rapid global convergence owing to the property of the Galerkin projection onto a space \(W_N\) spanned by solutions of the governing partial differential equation at \(N\) (optimally) selected points in the parameter space, and (ii) the offline/online computational procedures that decouple the generation and projection stages of the approximation process.This method is well suited for the repeated and rapid evaluations required in the context of parameter estimation, design, optimization, and real-time control. Our analysis focuses on: (i) the pressure treatment of incompressible Navier-Stokes problem; (ii) the fulfillment of an equivalent inf-sup condition to guarantee the stability of the reduced basis solutions. The applications that we consider involve parametrized geometries, like e.g. a channel with curved upper wall or an arterial bypass configuration.

MSC:
76M10 Finite element methods applied to problems in fluid mechanics
65N35 Spectral, collocation and related methods for boundary value problems involving PDEs
76D05 Navier-Stokes equations for incompressible viscous fluids
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