Numerical Study on Transition to Turbulent Flow beneath Solitary Wave
Bambang Winarta (a*) , Hitoshi Tanaka (b) , Hiroto Yamaji (b) , Pitojo Tri Juwono (a)
(a) Water Resources Engineering Department, Faculty of Engineering, University of Brawijaya, Indonesia
*bambang.winarta[at]ub.ac.id
(b) Civil Engineering Department, Faculty of Engineering, Tohoku University, Japan
Abstract
Understanding of sea bottom boundary layer characteristics, especially bottom shear stress acting on the sea bed, is an important step needed in sediment transport modeling for practical application purposes. In the present study, boundary layer characteristics on transition to turbulent flow under solitary wave over smooth bed are investigated through BSL k-w model proposed by Menter (1994) and it will consider also on the result of laboratory experiment performed by closed conduit generation system. The conclusion says that BSL k-w model capable to replicate horizontal velocity distribution at inner boundary layer on Reynolds number (Re) = 6.06x10^5 and 7.34x10^5. In addition, turbulent spike which is occurred during decelerating phases of oscillatory motion can be predicted by BSL k-w model.
Keywords: solitary wave, boundary layer, turbulence model, velocity distribution
Topic: Civil Engineering