基于SPH方法和半拉格朗日方法的沸腾现象模拟

Simulation of boiling phenomena based on SPH and semi-Lagrangian method

水沸腾现象存在以下问题:只关注气泡和水的相互作用,忽略蒸汽的模拟;仅考虑气泡的运动和水之间的互动,忽略水温变化产生的水体本身的循环运动。针对上述2个问题,文章给出了一种网格法和粒子法相结合的模型,用多相流的SPH方法模拟水和气泡,用半拉格朗日方法模拟蒸汽,同时使用实时数据传输的方式实现了气泡、水和蒸汽的同步模拟。相比目前方法仅考虑水和气泡的相互作用,该文模型加入了水由于热传导产生的作用力,展示了由于水温变化造成的水自身的运动,使模拟结果更加贴近实际。

The simulation of water boiling usually has two problems as follows:the simulation only focused on bubbles and water,ignoring the simulation of water vapor;and it only considered the interaction between bubble motion and water,ignoring the circular movement caused by changes of water temperature.In this paper,a new method of the combination of grid method and particle method is given for dealing with these two problems.The multiphase flow SPH method is used to simulate water and air bubbles,and the semi-Lagrangian method is used to simulate water vapor.At the same time,the real-time data transmission is used to realize the synchronous simulation of water,bubbles and water vapor.In addition,this method takes into account the force due to thermal conduction of water and realizes the movement of the water due to changes of water temperature,thus making the results closer to reality.