阻塞效应显著的限制水域船舶水压场数值模型构建与应用

水压水雷依靠船体航行引起的水压场信号而工作,其在浅水、近海等限制水域布防威胁更大.为准确预报限制水域船舶水压场特性,基于黏流理论构建船舶水压场计算流体动力学数值模型,对船舶航行于极窄矩形、阶梯航道等限制水域产生的升沉纵倾、兴波、阻力及水压场等进行计算,并与文献9]对比分析;基于势流理论构建船舶水压场有限差分数值模型,...

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

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.