Experimental study on influencing factors of force change of slender submerged body under internal solitary wave

Internal Wave (IW) is a kind of wave that occurs below the sea surface. Compared with surface wave, the force applied to underwater structures is more destructive. This paper experimentally investigates the interaction process between Internal Solitary Wave (ISW) and submerged body, and proposes two new dimensionless parameters and uses these two dimensionless parameters to analyze the force of the submerged body with different ISW amplitude and submerged depth. At the same time, these two dimensionless parameters can be used to classify the lateral force and vertical force of the submerged body. Finally, the influence of velocity and acceleration field on the force of the submerged body is considered. The results show that the extreme value will increase with the increase of ISW amplitude. The variation of horizontal force under d0∗ condition is completely different from that of d+∗ and d−∗. The dimensionless number L∗ affects the action time, and the dimensionless number d∗ affects the change rule of vertical force. The horizontal inertial force plays a dominant role in the horizontal force. When d∗=−1.17, the inertial force plays a dominant role in the vertical force. When d∗>0, the drag force plays a dominant role in the vertical force.