Research Article
Analysis of the Natural Vibration Characteristics of a Supercavitating Underwater Vehicle Considering Hydrodynamic Conditions
Se Ryung Jo,
Chol Hun Kim,
Kwang Il Ri*
Issue:
Volume 12, Issue 1, March 2026
Pages:
1-15
Received:
30 November 2025
Accepted:
29 December 2025
Published:
23 January 2026
Abstract: The supercavitating underwater vehicle is affected by the hydrodynamic forces acting on the cavitator, body and fins, and thrust force of the engine, and these external forces affect the natural vibration of the supercavitating underwater vehicle. Accurate analysis of natural frequencies and natural modes has a great importance in the structural design of supercavitating underwater vehicles. In this paper, a Euler-Bernoulli beam model with a non-uniform cross section was applied to analyze the natural vibration characteristics of the supercavitating underwater vehicle more accurately. Also, the force characteristics acting on the supercavitating underwater vehicle with different speeds, angles of attack, cavitation numbers, fin positions and mass variations were analyzed and the natural vibration characteristics were analyzed by applying the Riccati transfer matrix method. The main influence of the natural vibration characteristics on the analysis of the natural vibration characteristics of supercavitating underwater vehicles by applying the Euler-Bernoulli beam theory through the calculation results is the distribution of the axial force formed by the total external force and the mass change characteristic. Also, the natural vibration characteristics of the system are sensitive to changes in cavitation number, angle of attack, vehicle velocity, fin position, and mass distribution, so that the change in the characteristic of the system can be accurately analyzed to ensure the reliability of the structural design.
Abstract: The supercavitating underwater vehicle is affected by the hydrodynamic forces acting on the cavitator, body and fins, and thrust force of the engine, and these external forces affect the natural vibration of the supercavitating underwater vehicle. Accurate analysis of natural frequencies and natural modes has a great importance in the structural de...
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Research Article
Modeling of Ventilation Characteristics Formed by Jet in Cross Flow
Ju-Song Pak,
Myong-Jin Jo,
Kwang-Il Ri*
Issue:
Volume 12, Issue 1, March 2026
Pages:
16-23
Received:
6 October 2025
Accepted:
8 November 2025
Published:
25 February 2026
DOI:
10.11648/j.ijfmts.20261201.12
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Abstract: It is important to accurately model and analyze the ventilation characteristics formed by jet in cross flow (JICF) of liquid around a plate. Through 3D numerical simulations (using FLUENT), design of experiment (DOE) and regression, a mathematical model is constructed to accurately describe the process of formation of ventilated cavity by gas jet in cross flow of the liquid phase. Multiphase flow and turbulence models are established to reflect the formation and development of the ventilated cavity, and a reasonable simulation plan is established by means of design of experiment, and a regression model is obtained through nonlinear regression. A reasonable simulation plan is established to model the different factors impact on the size of the ventilation cavity and to comprehensively reflect its effect. Ventilation characteristics formed by JICF are then compared with experimental results. The results of various comparative analyses show that the 3D simulation method presented in this paper can more accurately reflect the ventilated cavity formation and, with this, evaluate the ventilation characteristics and make the design reasonably with the mathematical model obtained through design of experiment nonlinear regression. It is of great significance in many applications, including pump jet propeller design, by optimizing the design to meet the given design conditions with reasonable variations of parameters.
Abstract: It is important to accurately model and analyze the ventilation characteristics formed by jet in cross flow (JICF) of liquid around a plate. Through 3D numerical simulations (using FLUENT), design of experiment (DOE) and regression, a mathematical model is constructed to accurately describe the process of formation of ventilated cavity by gas jet i...
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