Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular CylinderReportar como inadecuado




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Fluid Dynamics Laboratory, Università della Calabria, Via P. Bucci 42b, Rende Cosenza 87036, Italy





Academic Editor: Demos T. Tsahalis

Abstract A computational analysis is performed on the diffraction of water waves induced by large-diameter, surface-piercing, vertical circular cylinder. With reference to linear-wave cases, the phenomenon is preliminarly considered in terms of velocity potential, a simplified theoretical framework in which both hypotheses of inviscid fluid and irrotational flow are incorporated. Then, and as a first-approximation analysis, the Euler equations in primitive variables are considered a framework in which the fluid is still handled as inviscid, but the field can be rotational. Finally, the real-fluid behavior is analyzed, by numerically integrating the full Navier-Stokes equations viscous fluid and rotational field in their velocity-pressure formulation, by following the approach of the Direct Numerical Simulation DNS, no models are used for the fluctuating portion of the velocity field. For further investigation of the flow fields, the swirling-strength criterion for flow-structure extraction, and the Karhunen-Loève KL decomposition technique for the extraction of the most energetic flow modes respectively, are applied to the computed fields. It is found that remarkable differences exist between the wave-induced fields, as derived within the different computing frameworks tested. View Full-Text

Keywords: diffraction of water waves; surface-piercing vertical circular cylinder; velocity potential; Euler equations; Navier-Stokes equations; swirling-strength criterion for flow-structure extraction; Karhunen Loève decomposition diffraction of water waves; surface-piercing vertical circular cylinder; velocity potential; Euler equations; Navier-Stokes equations; swirling-strength criterion for flow-structure extraction; Karhunen Loève decomposition





Autor: Giancarlo Alfonsi

Fuente: http://mdpi.com/



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