NMOHEMS探头下沉运动的三维仿真方法研究

Study of 3D Simulation Approach of NMOHEMS Probe Dropping

为研究NMOHEMS探头下沉运动过程中各运动参数及流场的变化情况,基于转捩模式,采用三维动态混合网格模型的动网格技术,建立了NMOHEMS探头下沉运动的三维仿真方法,实现了对探头下沉过程的数值仿真;并对转捩的临界雷诺数进行了分析,通过选取不同雷诺数进行转捩,并将计算结果与实验结果对比,初步判断常温淡水环境下转捩的临界雷诺数约为300;仿真计算结果中的深度、速度和加速度变化均与实验结果吻合较好,证明了该三维仿真方法是合理可行的。工作可为NMOHEMS系列探头的设计及其运动的数值仿真提供理论基础。

A 3D simulation method to NMOHEMS probe dropping process is presented to study the change of motion parameters and fluency, which is based on the transition model, 3D hybrid dynamic grids and dynamic mesh technique. The dropping process was simulated numerically, and critical Reynolds number of transition was analyzed, which was pre-judged approximately to 300 after choosing different Reynolds numbers. The results of numerical simulation coincide with that of experiment in terms of the depth, velocity and acceleration, and which showed that the method is reasonable and feasible. The study can lay a foundation for the numerical simulation of the accelerated motion underwater for the series of NMOHEMS probes.