Super cavity model with the coupling reaction of slender body motion and water flow

Tran Thu Ha, Nguyen Duc Thuyen, Nguyen Thai Dung, Duong Ngoc Hai
Author affiliations


  • Tran Thu Ha Institute of Mechanics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
  • Nguyen Duc Thuyen Military Technology Institute, Hanoi, Vietnam
  • Nguyen Thai Dung Military Technology Institute, Hanoi, Vietnam
  • Duong Ngoc Hai Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam



cavity model, Runge-Kutta method, CFD model, coupling model


On the imperfect water entry, a high-speed slender body moving in the forward direction, rotates inside the cavity. The body's motion makes super cavity phenomena in the water flow. The water velocity and pressure fields interact during the body's motion. In this paper, the coupling simulation model is a combination of two sub-models: In the first sub-model, the motion of slender body running very fast underwater is simulated. The equation system of this sub-model is solved by Runge-Kutta method; In the second sub-model, the water flow and pressure field under reaction of very fast slender body motion are simulated by CFD model. The simulation results of this coupled model are compared with experiments based on magnitudes of velocity U by x0 direction and error percents for cavity diameter and length.


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