利用并行算法分析平底结构砰击作用下具有自由表面水域的水动力特性

Hydrodynamic Analysis of Limited Waters with Free Surface Effect under Slamming of a Flat-bottom Structure with Parallel Algorithm

采用VOF和动网格方法、考虑限制水域边界条件的约束因素。利用CFD商业软件FLUENT通过求解脉冲砰击压力作用下具有自由表面限制水域上的Navier-Stokes方程来分析与观察平底结构从一定的高度以一定速度落下砰击限制水域的水面所引起的三维流体动力现象。数值模拟结果表明:采用所提出的数值方法可以对平底结构砰击压力作用于考虑自由表面效应的封闭或开放水域的水面所激发起的水面波动和水下压力场变化进行有效的数值模拟。所利用若干台多核微型计算机对平底结构撞击自由水面所引起的砰击问题进行的并行算法,为利用并行算法分析大型平底结构砰击限制水域水面所产生的水动力现象进行了有益的尝试。

3-D hydrodynamic characteristics of limited waters under the slamming by a flat-bottom structure falling at a certain velocity in a certain height is analyzed by means of solving the Navier-Stokes equations in the waters with the commercial CFD code FLUENT. The analysis is conducted based on the VOF method and Dynamic Mesh method with free surface effect and the factors of limited boundary conditions being considered. Numerical simulation result with the proposed numerical approach indicates that an effective numerical description of 3-D wave-making and underwater pressure distribution variation agitated by the impulse slamming pressure of a flat-bottom structure exerting on the free surface of closed waters or open channel can be obtained by the method. A beneficial attempt is conducted by utilizing a parallel processing method with multi-core grouped computers to analyze the slamming problem in a free surface of a limited water impacted by a flat bottom structure.