Direct numerical simulation of laminar boundary layer interaction with a wall-mounted circular cylinder at low-Reynolds number

被引:1
作者
Asgari, Ehsan [1 ]
Saeedi, Mohammad [1 ]
机构
[1] Dalhousie Univ, Dept Mech Engn, Halifax, NS B3H 4R2, Canada
关键词
LARGE-EDDY SIMULATION; SQUARE CYLINDER; TURBULENT WAKE; ASPECT RATIO; FREE END; FLOW; DYNAMICS; UNIFORM; SINGLE; LES;
D O I
10.1063/5.0217885
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In our current study, we employ direct numerical simulation to investigate the interaction between a laminar boundary layer flow and a wall-mounted circular cylinder with an aspect ratio of 4 and a Reynolds number of 750, based on the cylinder diameter and free-stream velocity. As highlighted in recent works by Morton et al. [Int. J. Heat Fluid Flow 72, 109-122 (2018)] and Crane et al. [J. Fluid Mech. 931, R1 (2022)], understanding of flow at low-Reynolds number around wall-mounted circular cylinders remains limited, motivating our study to contribute to this knowledge gap. Our objectives include exploring flow topology, analyzing first- and second-order statistics to characterize the turbulent wake flow, and investigate turbulent kinetic energy transport budgets to comprehend energy transfer mechanisms behind the cylinder. Our spectral analysis of velocity content reveals a low-frequency peak, consistent with recently published literature. However, we observe certain discrepancies between our findings and those of similar studies conducted at lower Reynolds numbers, particularly regarding the frequency content of the wake region. We employ dynamic mode decomposition to unravel the flow dynamics associated with the highest-amplitude mode. Our results indicate that the low-frequency mode reported in the above-mentioned references primarily correlates with the incoming boundary layer and is prominently evident in the lateral force coefficient, in contrast to scenarios at higher Reynolds numbers.
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页数:19
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共 75 条
[1]   Turbulent wake of a finite circular cylinder of small aspect ratio [J].
Adaramola, M. S. ;
Akinlade, O. G. ;
Sumner, D. ;
Bergstrom, D. J. ;
Schenstead, A. J. .
JOURNAL OF FLUIDS AND STRUCTURES, 2006, 22 (6-7) :919-928
[2]   On Direct Numerical Simulation of Turbulent Flows [J].
Alfonsi, Giancarlo .
APPLIED MECHANICS REVIEWS, 2011, 64 (02)
[3]   Active control of flow over a rounded ramp by means of single and double adjacent rectangular synthetic jet actuators [J].
Asgari, E. ;
Tadjfar, M. .
COMPUTERS & FLUIDS, 2019, 190 :98-113
[4]   Role of phase-difference between two adjacent rectangular synthetic jet actuators in active control of flow over a rounded ramp [J].
Asgari, Ehsan ;
Tadjfar, Mehran .
PHYSICS OF FLUIDS, 2022, 34 (02)
[5]   Large-eddy simulation of a developing turbulent boundary layer over a wall-mounted hemisphere under the influence of a surrounding ditch: Flow characteristics and aerodynamic forces [J].
Asgari, Ehsan ;
Saeedi, Mohammad ;
Etemadi, Majed .
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 2022, 227
[6]   Assessment of four inflow conditions on large-eddy simulation of a gently curved backward-facing step [J].
Asgari, Ehsan ;
Tadjfar, Mehran .
JOURNAL OF TURBULENCE, 2017, 18 (01) :61-86
[7]   FLOW AROUND A SURFACE-MOUNTED CUBE IN UNIFORM AND TURBULENT STREAMS [J].
CASTRO, IP ;
ROBINS, AG .
JOURNAL OF FLUID MECHANICS, 1977, 79 (FEB22) :307-&
[8]   Tomographic PIV investigation of vortex shedding topology for a cantilevered circular cylinder [J].
Crane, R. J. ;
Popinhak, A. R. ;
Martinuzzi, R. J. ;
Morton, C. .
JOURNAL OF FLUID MECHANICS, 2021, 931
[9]   Boundary layer effect on the vortex shedding of wall-mounted rectangular cylinder [J].
El Hassan, M. ;
Bourgeois, J. ;
Martinuzzi, R. .
EXPERIMENTS IN FLUIDS, 2015, 56 (02)
[10]   Time-resolved wake dynamics of finite wall-mounted circular cylinders submerged in a turbulent boundary layer [J].
Essel, Ebenezer E. ;
Tachie, Mark F. ;
Balachandar, Ram .
JOURNAL OF FLUID MECHANICS, 2021, 917