Numerical Investigations of Vortex-Cylinder Mechanism of Interaction using LES and URANS

Patricia Coronado; Marcel Ilie; Ge-Cheng Zha

doi:10.2514/6.2011-57

Numerical Investigations of Vortex-Cylinder Mechanism of Interaction using LES and URANS

Patricia Coronado, Marcel Ilie, Ge-Cheng Zha

Mechanical Engineering

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Abstract

Numerical simulations of a single vortex superimposed on a uniform flow past a circular cylinder are performed using large eddy simulation (LES), unsteady Reynolds averaged Navier-Stokes equations (URANS) and delayed detached eddy simulation (DDES) for a high Reynolds number flow, Re=1.4x10^6, based on the cylinder diameter and the free stream velocity. The URANS approach fails to accurately predict the unsteady flow field due to excessive dissipation. The LES technique provides a promising tool for obtaining the unsteady wall-pressure fields, aerodynamic coefficients and the acoustic source functions. From the LES results, it was observed that presence of the vortex in the flow field causes an increase of Strouhal number. The influence of vortex-cylinder horizontal miss-distance on the aerodynamic coefficients was also investigated, indicating that the flow field will record to its original state after similar time intervals, about 0.06s.

Original language	American English
Title of host publication	Proceedings of the Aerospace Sciences Meeting
DOIs	https://doi.org/10.2514/6.2011-57
State	Published - Jan 4 2011

Keywords

LES
Mechanism of interaction
URANS
Vortex-cylinder mechanism

DC Disciplines

Mechanical Engineering

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title = "Numerical Investigations of Vortex-Cylinder Mechanism of Interaction using LES and URANS",

abstract = " Numerical simulations of a single vortex superimposed on a uniform flow past a circular cylinder are performed using large eddy simulation (LES), unsteady Reynolds averaged Navier-Stokes equations (URANS) and delayed detached eddy simulation (DDES) for a high Reynolds number flow, Re=1.4x10^6, based on the cylinder diameter and the free stream velocity. The URANS approach fails to accurately predict the unsteady flow field due to excessive dissipation. The LES technique provides a promising tool for obtaining the unsteady wall-pressure fields, aerodynamic coefficients and the acoustic source functions. From the LES results, it was observed that presence of the vortex in the flow field causes an increase of Strouhal number. The influence of vortex-cylinder horizontal miss-distance on the aerodynamic coefficients was also investigated, indicating that the flow field will record to its original state after similar time intervals, about 0.06s.",

keywords = "LES, Mechanism of interaction, URANS, Vortex-cylinder mechanism",

author = "Patricia Coronado and Marcel Ilie and Ge-Cheng Zha",

year = "2011",

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doi = "10.2514/6.2011-57",

language = "American English",

booktitle = "Proceedings of the Aerospace Sciences Meeting",

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TY - CHAP

T1 - Numerical Investigations of Vortex-Cylinder Mechanism of Interaction using LES and URANS

AU - Coronado, Patricia

AU - Ilie, Marcel

AU - Zha, Ge-Cheng

PY - 2011/1/4

Y1 - 2011/1/4

N2 - Numerical simulations of a single vortex superimposed on a uniform flow past a circular cylinder are performed using large eddy simulation (LES), unsteady Reynolds averaged Navier-Stokes equations (URANS) and delayed detached eddy simulation (DDES) for a high Reynolds number flow, Re=1.4x10^6, based on the cylinder diameter and the free stream velocity. The URANS approach fails to accurately predict the unsteady flow field due to excessive dissipation. The LES technique provides a promising tool for obtaining the unsteady wall-pressure fields, aerodynamic coefficients and the acoustic source functions. From the LES results, it was observed that presence of the vortex in the flow field causes an increase of Strouhal number. The influence of vortex-cylinder horizontal miss-distance on the aerodynamic coefficients was also investigated, indicating that the flow field will record to its original state after similar time intervals, about 0.06s.

AB - Numerical simulations of a single vortex superimposed on a uniform flow past a circular cylinder are performed using large eddy simulation (LES), unsteady Reynolds averaged Navier-Stokes equations (URANS) and delayed detached eddy simulation (DDES) for a high Reynolds number flow, Re=1.4x10^6, based on the cylinder diameter and the free stream velocity. The URANS approach fails to accurately predict the unsteady flow field due to excessive dissipation. The LES technique provides a promising tool for obtaining the unsteady wall-pressure fields, aerodynamic coefficients and the acoustic source functions. From the LES results, it was observed that presence of the vortex in the flow field causes an increase of Strouhal number. The influence of vortex-cylinder horizontal miss-distance on the aerodynamic coefficients was also investigated, indicating that the flow field will record to its original state after similar time intervals, about 0.06s.

KW - LES

KW - Mechanism of interaction

KW - URANS

KW - Vortex-cylinder mechanism

UR - https://doi.org/10.2514/6.2011-57

U2 - 10.2514/6.2011-57

DO - 10.2514/6.2011-57

M3 - Chapter

BT - Proceedings of the Aerospace Sciences Meeting

ER -

Numerical Investigations of Vortex-Cylinder Mechanism of Interaction using LES and URANS

Abstract

Keywords

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