题目：A Unified Gas-kinetic Scheme for all Knudsen Number Flows

报告人：徐昆 教授 Hong Kong University of Science and Technology

时间：2010年3月19日(星期五)，下午3：00-4：30

地点：力学所主楼312会议室

报告主要内容：

With discretized particle velocity space, a unified gas-kinetic scheme for

entire Knudsen number flows is constructed based on the BGK model. In

comparison with many existing kinetic schemes for the Boltzmann equation,the current method has no difficulty to get accurate Navier-Stokes (NS) solution in the continuum flow regime, and the highly non-equilibrium solution, even for the free molecule flow. The success of the method is due to the un-splitting treatment for the particle transport and collision in the evaluation of local solution of the gas distribution function. As a result, the time step used in current method is on the order of particle collision time over local Knudsen number, where due to small Knudsen number in the continuum flow regime the time step used can be many orders larger than the particle collision time. Therefore, the unified scheme is much more efficient than all currently existing kinetic solvers, especially for the flow problems which cover all Knudsen number regimes.

The current research is from a joint work with J.C. Huang.