Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling in a High Performance Computing framework
•Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling.•A parallel multigrid preconditioner is defined and applied.•The choice of the stabilization parameters for the VMS-LES formulation is discussed.•The benchmark of the flow past a squared cylinder at Reynolds...
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| Vydáno v: | Computers & fluids Ročník 117; s. 168 - 182 |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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Elsevier Ltd
31.08.2015
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| ISSN: | 0045-7930, 1879-0747 |
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| Abstract | •Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling.•A parallel multigrid preconditioner is defined and applied.•The choice of the stabilization parameters for the VMS-LES formulation is discussed.•The benchmark of the flow past a squared cylinder at Reynolds number 22,000 is solved.
In this paper, we propose a semi-implicit approach for the time discretization of the Navier–Stokes equations with Variational Multiscale-Large Eddy Simulation turbulence modeling (VMS-LES). For the spatial approximation of the problem, we use the Finite Element method, while we employ the Backward Differentiation Formulas (BDF) for the time discretization. We treat the nonlinear terms arising in the variational formulation of the problem with a semi-implicit approach leading to a linear system associated to the fully discrete problem which needs to be assembled and solved only once at each discrete time instance. We solve this linear system by means of the GMRES method by employing a multigrid (ML) right preconditioner for the parallel setting. We validate the proposed fully discrete scheme towards the benchmark problem of the flow past a squared cylinder at high Reynolds number and we show the computational efficiency and scalability results of the solver in a High Performance Computing framework. |
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| AbstractList | In this paper, we propose a semi-implicit approach for the time discretization of the Navier-Stokes equations with Variational Multiscale-Large Eddy Simulation turbulence modeling (VMS-LES). For the spatial approximation of the problem, we use the Finite Element method, while we employ the Backward Differentiation Formulas (BDF) for the time discretization. We treat the nonlinear terms arising in the variational formulation of the problem with a semi-implicit approach leading to a linear system associated to the fully discrete problem which needs to be assembled and solved only once at each discrete time instance. We solve this linear system by means of the GMRES method by employing a multigrid (ML) right preconditioner for the parallel setting. We validate the proposed fully discrete scheme towards the benchmark problem of the flow past a squared cylinder at high Reynolds number and we show the computational efficiency and scalability results of the solver in a High Performance Computing framework. •Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling.•A parallel multigrid preconditioner is defined and applied.•The choice of the stabilization parameters for the VMS-LES formulation is discussed.•The benchmark of the flow past a squared cylinder at Reynolds number 22,000 is solved. In this paper, we propose a semi-implicit approach for the time discretization of the Navier–Stokes equations with Variational Multiscale-Large Eddy Simulation turbulence modeling (VMS-LES). For the spatial approximation of the problem, we use the Finite Element method, while we employ the Backward Differentiation Formulas (BDF) for the time discretization. We treat the nonlinear terms arising in the variational formulation of the problem with a semi-implicit approach leading to a linear system associated to the fully discrete problem which needs to be assembled and solved only once at each discrete time instance. We solve this linear system by means of the GMRES method by employing a multigrid (ML) right preconditioner for the parallel setting. We validate the proposed fully discrete scheme towards the benchmark problem of the flow past a squared cylinder at high Reynolds number and we show the computational efficiency and scalability results of the solver in a High Performance Computing framework. |
| Author | Dedè, Luca Forti, Davide |
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| Snippet | •Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling.•A parallel multigrid preconditioner is defined and applied.•The... In this paper, we propose a semi-implicit approach for the time discretization of the Navier-Stokes equations with Variational Multiscale-Large Eddy Simulation... |
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| SubjectTerms | Backward Differentiation Formulas Computer simulation Cylinders Discretization Finite Element method High Performance Computing Large Eddy Simulation Linear systems Marine Mathematical analysis Mathematical models Navier-Stokes equations Turbulent flow Variational Multiscale modeling |
| Title | Semi-implicit BDF time discretization of the Navier–Stokes equations with VMS-LES modeling in a High Performance Computing framework |
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