The Growth Process of Ice Particles in Clouds

9314465王：这项研究的主要目的是了解冰粒在云和降水中的生长过程。这项研究将研究大颗粒在空气中振荡运动时的生长情况。PI将在两种情况下研究冰粒的扩散增长和边缘形成，即从单个粒子和云动力学的角度。为了实现第一个目标，他们将数值求解绕过各种形状冰粒的非定常Navier-Stokes方程，然后利用所获得的流场通过求解水蒸气的对流扩散方程和过冷液滴的运动方程来确定扩散增长和边缘。为了实现第二个目标，他们将把获得的结果参数化，并将它们纳入云动力学模型。最后，他们将参与WISP94实验，收集真实的冰样，并使用他们的模型来解释观测结果。***

9314465 Wang The main objective of this study is to understand the growth process of ice particles in clouds and precipitation. The study will investigate the growth of large particles where the particles perform oscillating motions in air. The PIs will study both the diffusional growth and riming of ice particles in two contexts, i.e., from both the individual particle and cloud dynamical points of view. To achieve the first goal, they will numerically solve the unsteady Navier-Stokes equations for flow past ice particles of various shapes and then use the flow fields so obtained to determine the diffusional growth and riming by solving the convective diffusion equations of vapor and the equation of motion of supercooled droplets. To achieve the second goal, they will parameterize the results obtained and incorporate them in a cloud dynamical model. Finally, they will participate in the WISP94 experiment to collect real ice samples and use their models to interpret the observation. ***