LAUSR

Abstract This paper reports the results of laboratory experiments on the coupling wave-flow structure of an oblique internal solitary wave (ISW) and the force it exerts on a submerged slender body in a large stratified fluid flume. Multiple experimental techniques were used to measure the wave-flow field as well as the force on the slender body. Reasonable analysis reveals the effects of the propagation directions and amplitudes of the oblique ISW on the dynamic characteristics of the slender body at different water depths. The experimental results show that there is a significant shear effect from the horizontal velocity near the envelope of the ISW and sinking (upwelling) current from the vertical velocity in front of (behind) the ISW packet. The direction of the horizontal velocity above (below) the envelope is consistent with (opposite to) the propagation velocity of the ISW, with the former having a larger magnitude. The horizontal force depends on the velocity field induced by the oblique ISW, and the vertical force is determined by the coupling velocity and density field. The horizontal and vertical wave forces are calculated using Morison's formula corresponding to the respective component of velocity, with the vertical dynamic pressure transformed into the reduced gravity.