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Group of Marine Dynamics and Hydrodynamics > 2.2 Nonlinear Motions and Loads > Publications
Zhang, L., Gu, L.M., Kong, X.S., Wang, S. and Pei, Z.Y. (2025), Spatial-temporal evolution mechanism of underwater salvo of two slender bodies based on three degrees of freedom model, Ocean Engineering, Vol. 317, 120088.
Although the underwater salvo is more efficient than the single launch, the flow-mediated interaction between slender bodies makes the launch more complicated. To address the highly nonlinearity in fluid-structure interactions and the coupling motions of structures, a numerical method is proposed for analyzing the underwater salvo of two slender bodies under transverse flow. The three-degree-of-freedom (3-DOF) motion model of structures, combined with the cavitation and collision models, is adopted. The model is initially validated and verified through a comparison with the experimental results. Subsequently, the applicability of the model in flows is analyzed, and the effects of the launch time interval (?t) and spatial interval (?s) on the salvo are discussed. The findings demonstrate the effectiveness of proposed model, particularly in high-speed transverse flow and the strong flow-mediated interaction. When ?t and ?s are large, the slender bodies are mainly affected by the transverse flow, reducing success of salvo due to the collision between the bodies and their barrels. It is recommended that ?t = 0 with ?s = 2D (diameter of slender bodies) be employed to achieve both efficiency and success in the salvo. The peak pressures within the barrels especially when ?t=0 should also be considered in the structural design.
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