City Research Online

Abstract

In this study the numerical wave tank for fluid-structure interactions,Hydro3D-NWT, is employed to simulate the impact of a free-fall triangular wedge with the method of Large Eddy Simulations (LES). The filtered Navier-Stokes equations are solved based on finite differences for spatial partial derivatives on a staggered uniform Cartesian grid and the fractional step method is employed for time advancement. The effect of small dissipative flow structure is accounted for through a sub grid scale model, in this case, the wall-adaptive local eddy (WALE) viscosity model and a no-slip boundary condition on the moving structure is achieved using an immersed boundary method. Velocity is coupled with the pressure through the Poisson equation solved with an iterative multi grid technique. The calculated velocity and pressure field around the moving structure are integrated to calculate the pressure and shear stress forces to evaluate the new location of the structure through the solution of the equation of motion. In this study, a triangular wedge is left to fall from an initial height and the vertical location is compared with previously conducted experiments to evaluate the accuracy of the code in which results agree well with the laboratory measurements. The local hydrodynamics of the current application are visualized based on plots and figures of the instant velocity vector field and screenshots of the water surface throughout the impact. The strong impact as a result of the wedge’s sharp edge and relatively large initial height is well predicted by the proposed code while the large water surface fluctuations and high impact velocities are well resolved.

Publication Type:	Conference or Workshop Item (Paper)
Additional Information:	The final paper has been published by ISOPE and it's available online at: www.isope.org
Publisher Keywords:	Large eddy simulations; Fluid structure interactions; Floating structures; Wedge impact.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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