Implicit Large Eddy simulations of turbulent flow around a square cylinder at Re=22,000

•The Implicit LES approach with 2nd and 3nd order WENO scheme is applied to square cylinder flow at Re=22000.•The near wall performance of 3rd order WENO ILES is comparable to conventional LES with WALE model and out-performs LES with dynamic Smagorinsky model.•Both LES and ILES face challenge in te...

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Bibliographic Details
Published in:Computers & fluids Vol. 226; p. 1
Main Authors: Zeng, Kai, Li, Zhuoneng, Rana, Zeeshan A., Jenkins, Karl W.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Ltd 15.08.2021
Elsevier BV
Subjects:
Algorithms
Computational fluid dynamics
Cylinders
Eddy viscosity
Flow control
Fluid flow
Frequency stability
Implicit LES
Kelvin-Helmholtz instability
Large eddy simulation
Reynolds number
Shear layer
Shear layers
Shear stress
Simulation
Square cylinder
Time integration
Turbulent flow
Velocity coupling
Vortices
WENO
Implicit LES
Turbulent flow
Shear layer
Square cylinder
WENO
ISSN:0045-7930, 1879-0747
Online Access:Get full text
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Summary:•The Implicit LES approach with 2nd and 3nd order WENO scheme is applied to square cylinder flow at Re=22000.•The near wall performance of 3rd order WENO ILES is comparable to conventional LES with WALE model and out-performs LES with dynamic Smagorinsky model.•Both LES and ILES face challenge in terms of small quantities such as shear wall stress.•The 2nd-order WENO scheme can also give a fair prediction over the averaged statistics such as drag coefficient, Strouhal number, recirculation length and stream-wise velocity profile with less computational time than a 3rd-order WENO scheme. In this paper, the Implicit Large-Eddy Simulation (ILES) is investigated on the flow around a square cylinder incorporating an unstructured Weighted Essential Non-Oscillatory (WENO) reconstruction method for a Reynolds number of 22,000. Simulations are undertaken in the framework of open-source package OpenFOAM and additional implicit 2nd/3rd-order WENO scheme on the convective term of the viscous incompressible Navier-Stokes Equations. A 2nd-order Euler implicit time integration and Pressure-Implicit Splitting-Operator (PISO) algorithm is used to for the pressure-velocity coupling. Conventional LES with Wall Adapting Local Eddy Viscosity (WALE) model is also carried out as a baseline. The results are compared to high fidelity experiment, DNS data and conventional LES with dynamic Smagorinsky model from previous work. Results show favorable performance for ILES with 3rd-order WENO scheme compared with the conventional LES with dynamic Smagorinsky model and similar performance against LES with WALE model. Results also show acceptable predictions over time-averaged statistics with less computational effort for the ILES of 2nd-order WENO scheme. Shear layer flow analysis suggests that both ILES and LES face similar challenges with small quantities, such as shear stress. Finally, simulations are capturing von Kármán vortex, Kelvin-Helmholtz instability and induced frequency changes.
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ISSN:0045-7930
1879-0747
DOI:10.1016/j.compfluid.2021.105000