Proceedings ArticleDOI
Numerical study on aerodynamic and hydrodynamic noise from circular cylinders
Joemon Jacob,S. K. Bhattacharyya +1 more
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In this paper, an infinitely long circular cylinder subjected to low Reynolds number sub critical flow regime was modeled and large eddy simulations were performed on a smaller cylinder span length and correction factors were applied to account for the sound generated from longer span lengths.Abstract:
Estimation of aerodynamic as well as hydrodynamic noise from an infinitely long circular cylinder subjected to low Reynolds number sub critical flow regime is detailed in this study. Large Eddy Simulations were performed on a smaller cylinder span length and correction factors were applied to account for the sound generated from longer span lengths. A comparison of spatial coherence lengths, which account for the sound correction factor in different fluid mediums is intended from the study. Computed aerodynamic noise favorably agrees with measured values and the same methodology was adopted for the estimation of hydrodynamic noise.read more
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Journal ArticleDOI
On Sound Generated Aerodynamically. I. General Theory
TL;DR: In this paper, a theory for estimating the sound radiated from a fluid flow, with rigid boundaries, which as a result of instability contains regular fluctuations or turbulence is initiated, based on the equations of motion of a gas.
Journal ArticleDOI
Sound Generation by Turbulence and Surfaces in Arbitrary Motion
TL;DR: In this article, sound generation by turbulence and surfaces in arbitrary motion is discussed, and sound and multipole fields and governing equations are discussed. But sound generation is not discussed in this paper.
Journal ArticleDOI
The Influence of Solid Boundaries upon Aerodynamic Sound
TL;DR: In this paper, an extension to Lighthill's general theory of aerodynamic sound was made to incorporate the influence of solid boundaries upon the sound field, and it was shown that these effects are exactly equivalent to a distribution of dipoles, each representing the force with which unit area of solid boundary acts upon the fluid.
Journal ArticleDOI
Fluctuating lift on a circular cylinder: review and new measurements
TL;DR: In this article, the effects of Reynolds number in the nominal case of an infinitely long and non-confined cylinder in a smooth oncoming flow are discussed, from about Re = 47 to 2 x 10(5), i.e., from the onset of vortex shedding up to the end of the subcritical regime.
Book
Numerical experiments on the flow past A circular cylinder at sub-critical reynolds number
Patrick Beaudan,Parviz Moin +1 more
TL;DR: In this article, the performance of the dynamic subgrid-scale eddy-viscosity model and the suitability of high-order accurate, upwind-biased numerical methods for large eddy simulations of complex flows are investigated in the case of the turbulent wake behind a circular cylinder at Reynolds number 3,900, based on freestream velocity and cylinder diameter.