Collisions of inertial droplets in high Reynolds number flow

为了研究空气湍流中惯性粒子的湍流碰撞，开发了一个高性能的粒子浸入式湍流并行程序。代码采用了我们原来的强制方法，称为简化通信强制，以达到固定状态。代码使我们能够获得湍流碰撞频率高达Re_λ=340的统计数据，其中Re_λ为基于泰勒微尺度的雷诺数。这些数据表明，传统的碰撞频率模型低估了高Re_λ流中的湍流碰撞频率。

A high-performance parallel code for particle-immersed turbulence has been developed to investigate turbulent collisions of inertial particles in air turbulence. The code adopts our original forcing method, named reduced communication forcing, to achieve a stationary state. The code has enabled us to obtain the statistics concerning turbulent collision frequency in as high as Re_λ=340, where Re_λ is Taylor microscale based Reynolds number. This data has revealed that a conventional collision frequency model underestimates turbulent collision frequency in high Re_λ flows.