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NUMERICAL STUDY OF TURBULENT MANOEUVRING-BODY WAKES: INTERACTION WITH A FREE SURFACE

Watchapon Rojanaratanangkule
School of Engineering Sciences University of Southampton Highfield, Southampton, Hampshire, SO17 1BJ, UK

T. Glyn Thomas
School of Engineering Sciences, University of Southampton Highfield, Southampton, Hampshire, SO17 1BJ, UK

Gary N. Coleman
School of Engineering Sciences, University of Southampton Highfield, Southampton, Hampshire, SO17 1BJ, UK

Sinopsis

Direct Numerical Simulation (DNS) is used to investigate the interaction of a turbulent wake, created by an impulsively accelerating axisymmetric self-propelled body, below a free surface. The manoeuvring body is represented by the combination of an immersed boundary method and a body force. The Reynolds number based on either the diameter of the body or the jet forcing intensity is relatively high (O(1000)), corresponding to the fully turbulent case. The vertical growth of the coherent structure behind the body is restricted by the upper and lower stress-free layers and the wake signatures are observed to penetrate to the free surface.