Fully-nonlinear computation of water surface impact of axisymmetric bodies
We consider the problem of water surface impact by an axisymmetric object vertically drop-ping toward the calm water surface from the air. Fully nonlinear simulations, based on a high-orderboundary-element method with the mixed Eulerian-Laragian approach, are employed to investigatethis nonlinear uid-object interaction problem. The focus is on the understanding of the impact phe-nomenon at relatively low Froude number (with Fr_ V /(gL)1/2=O(1), where V is the entry velocityof the body, g the gravitational acceleration, and Lthe characteristic length of the body). In partic-ular, our objectives are to quantify the range of validity of existing asymptotic theories (using thehigh Froude number assumption, Fr 2 1), to understand the gravity effect upon the impact process,and to develop an effective approximate model for the prediction of impact pressure and loads on the body at low Froude number. This study is of direct relevance to reliable and accurate predictionof hydrodynamic loads associated with ship slamming and extreme surface wave impact on marinestructures.
water impact nonlinear uid-object interaction low Froude number impact impact loads
H.M.Yan Y.M.Liu D.K.P.Yue
Department of Mechanical Engineering, MIT, Cambridge, MA 02139, USA
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）