谐振子几何结构不同导致的水表面波各向异性

Water surface wave anisotropy phenomenon caused by harmonic oscillator's different geometric structures

利用高速摄像与Tracker视频追踪技术,并结合粒子图像测速处理及数值模拟方法,研究了水波发生振子在周期性振动过程中对水面漂浮物的排斥或牵引作用及漂浮物的运动轨迹,揭示了不同几何结构的振子产生的流体表面波各向异性的现象。实验发现表面波对漂浮物的作用主要取决于振子的几何结构,具体表现为圆柱体振子对表面漂浮物只存在排斥的作用,三棱柱振子在棱柱角的对应方向上对漂浮物存在定向牵引作用且在其他方向上存在排斥作用。进一步研究表明振子几何结构的不同致使其对水表面漂浮物既有排斥也有定向牵引,导致表面波对漂浮物的排斥或牵引现象在不同的波线上呈现各向异性。

A high speed video camera and the software Tracker were used and combined with the particle image velocimetry technique and the numerical simulation method to study a water wave generator＇s repulsion or traction to floating objects on water surface in its periodic oscillation process and motion trajectory of floating objects,and to reveal water surface wave anisotropy phenomenon caused by different resonator structures.The experiment results showed that the action of surface wave on floating objects mainly depends on oscillator＇s geometric structure; a cylindrical oscillator only has a repulsive action on floating objects,but a tri-prism oscillator has a directional traction action on floating objects along the direction corresponding to the prism angle,and a repulsive action along other directions; different geometric structures of oscillators make their actions on floating objects be not only repulsive but also directional tractive,these actions cause water surface wave along different wave lines is anisotropic.