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Mechanics in Engineering ›› 2005, Vol. 27 ›› Issue (5): 0-0.doi: 10.6052/1000-0992-2005-140

• Education Study •    

INFLUENCES OF CURRENT ON THE TURBULENT BEHAVIOUR OF WAVE BOUNDARY LAYER

  

  • Received:2005-04-08 Revised:1900-01-01 Online:2005-10-10 Published:2005-10-10

Abstract: Turbulent flow of wave current boundary layer is numerically investigated by using Large Eddy Simulation (LES) of the Navier Stokes equations, coupled with Smagorinsky subgrid-scale (SGS) model. To validate the present calculation and verify the performance of SGS model in the LES of wave current boundary layer, the present LES results are compared with the results of direct numerical simulation (DNS), and a reasonable agreement is found. Then, the databases of the wave current boundary layer flow are established, covering a wide range of wave Reynolds number ($1000 \le Re_w \le 3500)$ and the ratio of the velocities induced by current and wave ($0 \le u_c / u_w \le 3.0)$. The statistics, such as the velocity profiles, the Reynolds stress and the turbulence intensity, are studied. The influences of the current on these statistics are discussed. With the addition of currents, the velocity acceleration and deceleration cycle becomes asymmetrical, both the Reynolds stress and the turbulence intensity increase with the velocity of currents.

Key words: wave-current boundary layer, large eddy simulation