Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms

Dahai Yu; Kyle Butler; Ahsan Kareem; James Glimm; Jiangang Sun

doi:10.1061/(ASCE)EM.1943-7889.0000494

Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms

Dahai Yu
, Kyle Butler
, Ahsan Kareem
, James Glimm
, Jiangang Sun

Applied Mathematics and Statistics

Stony Brook University

University of Notre Dame
AIR Worldwide
Argonne National Laboratory

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

A numerical simulation of three-dimensional flow around rectangular prisms (two dimensional) of different aspect ratios, ranging from 0.3 to 7.0, is conducted at a Reynolds number of 10⁵, using large eddy simulation. This study identifies the influence of aspect ratio on the flow field around prisms and the attendant aerodynamics. Results show salient features in the flow field and associated pressure/aerodynamic forces caused by changes in the afterbody, which demonstrate good agreement with observations from wind tunnel experiments. A timefrequency analysis is introduced to identify the transient nature of fluctuations in the drag and lift coefficients, highlighting temporal variations in the frequency contents of these fluctuations and their resulting influence on force coefficients.

Original language	English
Pages (from-to)	429-438
Number of pages	10
Journal	Journal of Engineering Mechanics
Volume	139
Issue number	4
DOIs	https://doi.org/10.1061/(ASCE)EM.1943-7889.0000494
State	Published - 2013

Keywords

Aerodynamics
Aspect ratio
Bluff body
Drag
LES
Lift
Pressure coefficient
Turbulence

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10.1061/(ASCE)EM.1943-7889.0000494

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title = "Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms",

abstract = "A numerical simulation of three-dimensional flow around rectangular prisms (two dimensional) of different aspect ratios, ranging from 0.3 to 7.0, is conducted at a Reynolds number of 105, using large eddy simulation. This study identifies the influence of aspect ratio on the flow field around prisms and the attendant aerodynamics. Results show salient features in the flow field and associated pressure/aerodynamic forces caused by changes in the afterbody, which demonstrate good agreement with observations from wind tunnel experiments. A timefrequency analysis is introduced to identify the transient nature of fluctuations in the drag and lift coefficients, highlighting temporal variations in the frequency contents of these fluctuations and their resulting influence on force coefficients.",

keywords = "Aerodynamics, Aspect ratio, Bluff body, Drag, LES, Lift, Pressure coefficient, Turbulence",

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T1 - Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms

AU - Yu, Dahai

AU - Butler, Kyle

AU - Kareem, Ahsan

AU - Glimm, James

AU - Sun, Jiangang

PY - 2013

Y1 - 2013

N2 - A numerical simulation of three-dimensional flow around rectangular prisms (two dimensional) of different aspect ratios, ranging from 0.3 to 7.0, is conducted at a Reynolds number of 105, using large eddy simulation. This study identifies the influence of aspect ratio on the flow field around prisms and the attendant aerodynamics. Results show salient features in the flow field and associated pressure/aerodynamic forces caused by changes in the afterbody, which demonstrate good agreement with observations from wind tunnel experiments. A timefrequency analysis is introduced to identify the transient nature of fluctuations in the drag and lift coefficients, highlighting temporal variations in the frequency contents of these fluctuations and their resulting influence on force coefficients.

AB - A numerical simulation of three-dimensional flow around rectangular prisms (two dimensional) of different aspect ratios, ranging from 0.3 to 7.0, is conducted at a Reynolds number of 105, using large eddy simulation. This study identifies the influence of aspect ratio on the flow field around prisms and the attendant aerodynamics. Results show salient features in the flow field and associated pressure/aerodynamic forces caused by changes in the afterbody, which demonstrate good agreement with observations from wind tunnel experiments. A timefrequency analysis is introduced to identify the transient nature of fluctuations in the drag and lift coefficients, highlighting temporal variations in the frequency contents of these fluctuations and their resulting influence on force coefficients.

KW - Aerodynamics

KW - Aspect ratio

KW - Bluff body

KW - Drag

KW - LES

KW - Lift

KW - Pressure coefficient

KW - Turbulence

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DO - 10.1061/(ASCE)EM.1943-7889.0000494

M3 - Article

SN - 0733-9399

VL - 139

SP - 429

EP - 438

JO - Journal of Engineering Mechanics

JF - Journal of Engineering Mechanics

IS - 4

ER -

Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms

Abstract

Keywords

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