基于CFD的楔形体浅水入水砰击载荷分析-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Analysis of Impact Loads on Wedge for Shallow Water Entry Based on CFD

Author(s):: YUAN Yingcong; CHEN Chaohe; (School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)

Keywords:: computational fluid dynamics（CFD）; 2D wedge; water entry; swallow water; water impact

摘要:: 为了研究楔形体入水砰击载荷特性，应用重叠网格法对入水砰击过程进行了数值模拟，计算了三种入水速度下楔形体的砰击压力值。通过与试验结果对比，验证了数值模拟方法的有效性。此外，通过改变水深，模拟有限水深情况下的入水砰击过程，探究水深对楔形体表面压力、下落速度及自由液面的影响。结果表明：浅水中水深方向的壁面效应会使得作用在楔形体上压力的增加，水深越小，作用在楔形体上的砰击压力越大；水中水深方向的壁面效应同时也使楔形体产生与下落方向相反的加速度，水深越小，反向加速度越大；相对于无限水深，浅水情况下的自由液面会有更大地升高。

Abstract:: In order to study the characteristic of slamming pressure on wedge during entering water,overlapping grid method was used to simulate the water entry process.The slamming pressure of wedge at three different entry velocities was calculated.Moreover,the numerical simulation method was verified by comparing with the experimental result.In addition,by changing the water depth,the process of wedge entering water with finite depth was simulated to investigate the influence of water depth on the surface pressure,falling speed and free water surface.The results show that the water depth of shallow water will increase the pressure on the wedge.The shallower the water,the greater the pressure.The wall effect also causes the wedge to accelerate in the opposite direction of falling. The shallower the water,the greater the reverse acceleration.In addition,compared with infinite water depth,the free water surface will rise more significantly in shallow water.