Wind and Structures

  • 제34권1호
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  • Pages.59-72
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  • 2022
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Implicit Large Eddy Simulations of a rectangular 5:1 cylinder with a high-order discontinuous Galerkin method

  • Crivellini, Andrea (Department of Industrial Engineering and Mathematical Science, Marche Polytechnic University) ;
  • Nigro, Alessandra (Department of Industrial Engineering and Mathematical Science, Marche Polytechnic University) ;
  • Colombo, Alessandro (Department of Engineering and Applied Sciences, Universita degli Studi di Bergamo) ;
  • Ghidoni, Antonio (Department of Mechanical and Industrial Engineering, Universita degli Studi di Brescia) ;
  • Noventa, Gianmaria (Department of Mechanical and Industrial Engineering, Universita degli Studi di Brescia) ;
  • Cimarelli, Andrea (Department of Engineering "Enzo Ferrari", Universita degli Studi di Modena e Reggio Emilia) ;
  • Corsini, Roberto (Department of Engineering "Enzo Ferrari", Universita degli Studi di Modena e Reggio Emilia)
  • 투고 : 2021.03.18
  • 심사 : 2021.06.01
  • 발행 : 2022.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this work the numerical results of the flow around a 5:1 rectangular cylinder at Reynolds numbers 3 000 and 40 000, zero angle of attack and smooth incoming flow condition are presented. Implicit Large Eddy Simulations (ILES) have been performed with a high-order accurate spatial scheme and an implicit high-order accurate time integration method. The spatial approximation is based on a discontinuous Galerkin (dG) method, while the time integration exploits a linearly-implicit Rosenbrock-type Runge-Kutta scheme. The aim of this work is to show the feasibility of high-fidelity flow simulations with a moderate number of DOFs and large time step sizes. Moreover, the effect of different parameters, i.e., dimension of the computational domain, mesh type, grid resolution, boundary conditions, time step size and polynomial approximation, on the results accuracy is investigated. Our best dG result at Re=3 000 perfectly agrees with a reference DNS obtained using Nek5000 and about 40 times more degrees of freedom. The Re=40 000 computations, which are strongly under-resolved, show a reasonable correspondence with the experimental data of Mannini et al. (2017) and the LES of Zhang and Xu (2020).

키워드

과제정보

We acknowledge the european research infrastructure PRACE that, under the project SEPREA (High-order accurate direct numerical simulations of SEParating and REAttaching flow), has provided access to the Joliot-Curie high-performance computing resources at GENCI@CEA (France) used for the Direct Numerical Simulation reported in the present work. Furthermore, we acknowledge the CINECA award under the ISCRA initiative, for the availability of high-performance computing resources and support (ISCRAC ASU-ITIS), Matteo Franciolini for the data of set-up #5 and Pierangelo Conti who provided the grids G1 and G3.

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