DNS-DERIVED FORCE DISTRIBUTION ON FLEXIBLE CYLINDERS SUBJECT TO VORTEX-INDUCED VIBRATION

We use direct numerical simulation (DNS) based on spectral methods to simulate turbulent flow past rigid and flexible cylinders subject to vortex-induced vibrations (VIV). We present comparisons of amplitude, and lift and drag forces, at Reynolds number 1000 for a short and a long cylinder, and we e...

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Vydáno v:Journal of fluids and structures Ročník 14; číslo 3; s. 429 - 440
Hlavní autoři: EVANGELINOS, C., LUCOR, D., KARNIADAKIS, G.E.
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Elsevier Ltd 01.04.2000
Elsevier
Témata:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Mathematical methods in physics
Numerical approximation and analysis
Numerical simulation, solution of equations
Physics
Rotational flow and vorticity
Vortex dynamics
Spectral method
Turbulent flow
Digital simulation
Two dimensional model
Experimental study
Flexibility
Lift
Standing waves
Vibrations
Travelling waves
Drag
Vortices
Modelling
Vortex flow
Flexible structures
Comparative study
Cylinders
ISSN:0889-9746, 1095-8622
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Popis
Shrnutí:We use direct numerical simulation (DNS) based on spectral methods to simulate turbulent flow past rigid and flexible cylinders subject to vortex-induced vibrations (VIV). We present comparisons of amplitude, and lift and drag forces, at Reynolds number 1000 for a short and a long cylinder, and we examine differences between a traveling wave response and a standing wave response. The DNS data suggest that the often-used empirical formula proposed by Skop, Griffin & Ramberg in 1977 overpredicts the drag coefficient. We propose an appropriate modification and present preliminary results that indicate that low-dimensional modeling may be an accurate and efficient approach in predicting forces in VIV. Given the lack of any benchmark experiments in VIV currently, the DNS results presented here, both distributions as well as span- and time-averaged quantities, should be helpful to experimentalists and modelers.
ISSN:0889-9746
1095-8622
DOI:10.1006/jfls.1999.0278