HYDRODYNAMICS AND ACOUSTICS

This document is licensed under CC BY-NC-ND 4.0

2026 ◊ Volume 4 (94) ◊ Issue 1 ◊ p. 75-103  

https://doi.org/10.15407/jha2026.01.075

  Yu. M. Savchenko^*,   V. M. Semenenko^*,   G. Yu. Savchenko^*,   O. I. Naumova^*

^* Institute of Hydromechanics of NAS of Ukraine, Kyiv, Ukraine

Experimental study and computer simulation of dynamics of supercavitating bodies penetrating water at small angles to the free surface

Gidrodin. akust. 2026, 4(1):075-103

TEXT LANGUAGE: Ukrainian

ABSTRACT

The paper deals with developing the methodology of experimental study of the water entry and penetration by the models flying freely at small angles to the horizon. The model water penetration with the velocities of 10 m/s to 25 m/s was tested for angles of 4&deg to 15&deg. The photo sequences of the model motion and the cavity development have been obtained by high-speed video recording (the shooting speed is 1000 frames/s). The graphs of the experimental dependence of the model velocity, the flight distance, and the model pitch angle on time have been obtained by processing the photo sequences. Four types of dynamic behavior of models are described: water penetration in the supercavitation regime, underwater ricochet (the bounce), the model underwater rolling, and water-surface ricochet. The model mass center position effect on the model dynamics after the water entry is evaluated. The models with the mass center shifted to the tail occur less stably. The mathematical model and the method for calculating the supercavitation model dynamics, based on the principle of independence of the cavity section expansion by G. V. Logvinovich, are refined by the allowance for the free surface effect on the supercavity shape. This calculation method is implemented in the demonstration computer programs DIVE. Examples of computer simulations of hydrodynamic processes of different model water entry and water penetration are given. An estimation of the water surface ricochet probability on the plane of the starting parameters is given for different models. A comparison of the calculation results with the experimental data shows that this refined mathematical model allows us to correctly predict the main features of hydrodynamic processes at the supercavitating model's motion near the free surface and at the model water penetration under small angles to the free surface..

KEY WORDS

water entry, supercavitation, dynamics, ricochet, computer simulation

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