Lechner Christiane, Koch Max, Lauterborn Werner, Mettin Robert
Institute of Fluid Mechanics and Heat Transfer, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.
Drittes Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
J Acoust Soc Am. 2017 Dec;142(6):3649. doi: 10.1121/1.5017619.
The acoustic waves being generated during the motion of a bubble in water near a solid boundary are calculated numerically. The open source package OpenFOAM is used for solving the Navier-Stokes equation and extended to include nonlinear acoustic wave effects via the Tait equation for water. A bubble model with a small amount of gas is chosen, the gas obeying an adiabatic law. A bubble starting from a small size with high internal pressure near a flat, solid boundary is studied. The sequence of events from bubble growth via axial microjet formation, jet impact, annular nanojet formation, torus-bubble collapse, and bubble rebound to second collapse is described. The different pressure and tension waves with their propagation properties are demonstrated.
对水中靠近固体边界的气泡运动过程中产生的声波进行了数值计算。使用开源软件包OpenFOAM求解纳维-斯托克斯方程，并通过水的泰特方程进行扩展，以纳入非线性声波效应。选择了一个含有少量气体的气泡模型，气体遵循绝热定律。研究了一个在平坦固体边界附近从小尺寸开始且内部压力较高的气泡。描述了从气泡通过轴向微射流形成、射流冲击、环形纳米射流形成、环形气泡坍塌、气泡反弹到二次坍塌的一系列事件。展示了具有不同传播特性的压力波和张力波。
