Partially-averaged Navier–Stokes simulations of turbulent flow past a square cylinder: Comparative assessment of statistics and coherent structures at different resolutions

2020 ◽  
Vol 32 (12) ◽  
pp. 125106
Author(s):  
Thomas S. Fowler ◽  
Freddie D. Witherden ◽  
Sharath S. Girimaji
Keyword(s):  
Turbulent Flow ◽  
Coherent Structures ◽  
Comparative Assessment ◽  
Navier Stokes ◽  
Square Cylinder ◽  
Flow Past

scholarly journals Prediction of Turbulent Flow Around a Square Cylinder With Rounded Corners

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
S. S. Dai ◽  
B. A. Younis ◽  
H. Y. Zhang
Keyword(s):  
Turbulent Flow ◽  
Vortex Shedding ◽  
Turbulence Closure ◽  
Navier Stokes ◽  
Square Cylinder ◽  
Mean Flow ◽  
Drag Forces ◽  
Turbulence Closures ◽  
High Reynolds ◽  
Lift And Drag

Predictions are reported of the two-dimensional turbulent flow around a square cylinder with rounded corners at high Reynolds numbers. The effects of rounded corners have proved difficult to predict with conventional turbulence closures, and hence, the adoption in this study of a two-equation closure that has been specifically adapted to account for the interactions between the organized mean-flow motions due to vortex shedding and the random motions due to turbulence. The computations were performed using openfoam and were validated against the data from flows past cylinders with sharp corners. For the case of rounded corners, only the modified turbulence closure succeeded in capturing the consequences of the delayed flow separation manifested mainly in the reduction of the magnitude of the lift and drag forces relative to the sharp-edged case. These and other results presented here argue in favor of the use of the computationally more efficient unsteady Reynolds-averaged Navier-Stokes approach to this important class of flows provided that the effects of vortex shedding are properly accounted for in the turbulence closure.

scholarly journals Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

2014 ◽  
Vol 26 (10) ◽  
pp. 104101 ◽  
Author(s):  
Philippe Meliga ◽  
Edouard Boujo ◽  
Gregory Pujals ◽  
François Gallaire
Keyword(s):  
Turbulent Flow ◽  
Square Cylinder ◽  
Aerodynamic Forces ◽  
Flow Past ◽  
Laminar And Turbulent Flow

Numerical Turbulent Analysis for Flow Around a Square Cylinder Using the Finite Element Method

2003 ◽  
Author(s):  
Shinichiro Miura ◽  
Kazuhiko Kakuda
Keyword(s):  
Finite Element ◽  
Flow Field ◽  
Turbulent Flow ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Square Cylinder ◽  
Weak Formulation ◽  
Finite Element Scheme ◽  
Navier Stokes Equations ◽  
Element Scheme

A finite element scheme based on the Petrov-Galerkin weak formulation using exponential weighting functions for solving accurately, and in a stable manner, the flow field of an incompressible viscous fluid has been proposed in our previous works. In this paper, we present the Petrov-Galerkin finite element scheme for turbulent flow field. The incompressible Navier-Stokes equations are numerically integrated in time by using a fractional step strategy with second-order accurate Adams-Bashforth explicit differencing for both convection and diffusion terms. Numerical results obtained herein are compared through turbulent flow around a square cylinder at Re = 22,000 with the experimental data and other existing numerical ones.

Navier-Stokes solution of complete turbulent flow past finite axisymmetric bodies

AIAA Journal ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 998-1001 ◽  
Author(s):  
Seok Ki Choi ◽  
Ching Jen Chen
Keyword(s):  
Turbulent Flow ◽  
Navier Stokes ◽  
Flow Past ◽  
Axisymmetric Bodies

scholarly journals ENTROPIC LATTICE BOLTZMANN SIMULATION OF THE FLOW PAST SQUARE CYLINDER

2004 ◽  
Vol 15 (03) ◽  
pp. 435-445 ◽  
Author(s):  
SANTOSH ANSUMALI ◽  
SHYAM SUNDER CHIKATAMARLA ◽  
CHRISTOS EMMANOUIL FROUZAKIS ◽  
KONSTANTINOS BOULOUCHOS
Keyword(s):  
Reynolds Number ◽  
Lattice Boltzmann ◽  
Large Scale ◽  
Stokes Equations ◽  
Coarse Grained ◽  
Navier Stokes ◽  
Square Cylinder ◽  
Flow Past ◽  
Lattice Boltzmann Simulation ◽  
Decaying Turbulence

Minimal Boltzmann kinetic models, such as lattice Boltzmann, are often used as an alternative to the discretization of the Navier–Stokes equations for hydrodynamic simulations. Recently, it was argued that modeling sub-grid scale phenomena at the kinetic level might provide an efficient tool for large scale simulations. Indeed, a particular variant of this approach, known as the entropic lattice Boltzmann method (ELBM), has shown that an efficient coarse-grained simulation of decaying turbulence is possible using these approaches. The present work investigates the efficiency of the entropic lattice Boltzmann in describing flows of engineering interest. In order to do so, we have chosen the flow past a square cylinder, which is a simple model of such flows. We will show that ELBM can quantitatively capture the variation of vortex shedding frequency as a function of Reynolds number in the low as well as the high Reynolds number regime, without any need for explicit sub-grid scale modeling. This extends the previous studies for this set-up, where experimental behavior ranging from Re ~O(10) to Re ≤1000 was predicted by a single simulation algorithm.1–5

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