Numerical Models for Calculating Ship Hydrodynamic Pressure Field in Restricted Waters with Significant Blocking Effect

doi:10.12382/bgxb.2021.0106

Abstract

Abstract: Pressure mine works on the signal from ship hydrodynamic pressure field，which is more dangerous in shallow and offshore waters and so on. For obtaining the signals from ship hydrodynamic pressure fields in different restricted waters，a CFD numerical model is proposed based on the viscous theory，and the hydrodynamic characteristics, such as sinkage，trim，wave making and resistance, are calculated and validated. And a finite difference numerical model is established based on the potential flow theory，and the ship hydrodynamic pressure fields calculated by the two numerical models are compared. It is found that the two numerical models are different，but their calculated results are consistent，and they are both suitable for restricted waters with significant blocking effect or mixed flow.The results show that the more obvious the blocking effect is，the higher the grid division quality is，with giving small time step and setting denser grids near the water bottom and shore boundaries. If the blocking effect is more obvious，the restricted water has more significant effect on the hydrodynamic pressure field，and its negative pressure peak changes greatly，which may lead to the unreasonable design of mine fuze parameters，and miss the best detonation time.

Key words: shiphydrodynamicpressurefield, blockingeffect, restrictedwater, numericalmodel, mixedflow

CLC Number:

U661.33

DENG Hui， WANG Erli， YI Wenbin， WANG Kebin， ZHANG Zhihong. Numerical Models for Calculating Ship Hydrodynamic Pressure Field in Restricted Waters with Significant Blocking Effect[J]. Acta Armamentarii, 2022, 43(3): 605-616.

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