Large-eddy simulation of a circular cylinder on unstructured grids

R. P. Hansen, Lyle Norman Long

Research output: Contribution to conferencePaper

10 Citations (Scopus)

Abstract

A computational study of unsteady, separated, low-Reynolds number fluid flow is made using a second-order accurate, cell-centered finite-volume method on unstructured grids. The three-dimensional simulations include largeeddy simulation turbulence modeling using a fixed-coefficient Smagorinsky siibgrid-scale model. The flow about a three-dimensional circular cylinder at Reynolds number 3900 and Mach number 0.2 was studied using a standard Navier-Stokes formulation with and without the subgrid-scale modeling. A third case was also tested using a modified form of the Navier-Stokes equations with subgrid-scale modeling. Comparisons are made with experiment and selected three-dimensional numerical calculations performed on structured grids. The frequency of the unsteady vortex shedding was in good agreement with experiment, however, the numerical dissipation inherent in the upwind flux calculations affected the details of the time-averaged flowfield. The results showed an increased base pressure, shortened recirculation zones in the cylinder wake, and excessive drag compared to experiment for all cases.2002 by Hansen and Long.

Original languageEnglish (US)
StatePublished - Dec 1 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: Jan 14 2002Jan 17 2002

Other

Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
CountryUnited States
CityReno, NV
Period1/14/021/17/02

Fingerprint

large eddy simulation
Large eddy simulation
circular cylinders
Circular cylinders
base pressure
Reynolds number
vortex shedding
finite volume method
low Reynolds number
scale models
Mach number
wakes
Navier-Stokes equation
modeling
drag
fluid flow
dissipation
simulation
experiment
Experiments

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Hansen, R. P., & Long, L. N. (2002). Large-eddy simulation of a circular cylinder on unstructured grids. Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States.
Hansen, R. P. ; Long, Lyle Norman. / Large-eddy simulation of a circular cylinder on unstructured grids. Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States.
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Hansen, RP & Long, LN 2002, 'Large-eddy simulation of a circular cylinder on unstructured grids', Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States, 1/14/02 - 1/17/02.

Large-eddy simulation of a circular cylinder on unstructured grids. / Hansen, R. P.; Long, Lyle Norman.

2002. Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Large-eddy simulation of a circular cylinder on unstructured grids

AU - Hansen, R. P.

AU - Long, Lyle Norman

PY - 2002/12/1

Y1 - 2002/12/1

N2 - A computational study of unsteady, separated, low-Reynolds number fluid flow is made using a second-order accurate, cell-centered finite-volume method on unstructured grids. The three-dimensional simulations include largeeddy simulation turbulence modeling using a fixed-coefficient Smagorinsky siibgrid-scale model. The flow about a three-dimensional circular cylinder at Reynolds number 3900 and Mach number 0.2 was studied using a standard Navier-Stokes formulation with and without the subgrid-scale modeling. A third case was also tested using a modified form of the Navier-Stokes equations with subgrid-scale modeling. Comparisons are made with experiment and selected three-dimensional numerical calculations performed on structured grids. The frequency of the unsteady vortex shedding was in good agreement with experiment, however, the numerical dissipation inherent in the upwind flux calculations affected the details of the time-averaged flowfield. The results showed an increased base pressure, shortened recirculation zones in the cylinder wake, and excessive drag compared to experiment for all cases.2002 by Hansen and Long.

AB - A computational study of unsteady, separated, low-Reynolds number fluid flow is made using a second-order accurate, cell-centered finite-volume method on unstructured grids. The three-dimensional simulations include largeeddy simulation turbulence modeling using a fixed-coefficient Smagorinsky siibgrid-scale model. The flow about a three-dimensional circular cylinder at Reynolds number 3900 and Mach number 0.2 was studied using a standard Navier-Stokes formulation with and without the subgrid-scale modeling. A third case was also tested using a modified form of the Navier-Stokes equations with subgrid-scale modeling. Comparisons are made with experiment and selected three-dimensional numerical calculations performed on structured grids. The frequency of the unsteady vortex shedding was in good agreement with experiment, however, the numerical dissipation inherent in the upwind flux calculations affected the details of the time-averaged flowfield. The results showed an increased base pressure, shortened recirculation zones in the cylinder wake, and excessive drag compared to experiment for all cases.2002 by Hansen and Long.

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Hansen RP, Long LN. Large-eddy simulation of a circular cylinder on unstructured grids. 2002. Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States.