关键词: 计算流体力学(CFD), 龙卷风, 数值模拟, 汇流换热原理, 温度场

Abstract: A numerical model of the tornado was established by using computational fluid dynamics (CFD) method. Based on the speed type of the tornado in the plane, which was fitted to be the function relation, the initial velocity field and the related boundary condition were set in the 3D CFD program. Different initial temperature fields were carried out on a series of numerical simulations of tornado maintenance and development. The Ranque-Hilsch effect of the whirlpool and the convergence heat transfer principle were used to analyze the changes of the internal flow field variables of the two different temperature types in the tornado. It reveals the possibility of how the tornado was produced and continued, that is, the hot and cold air flow mixing and heat transfer which generated a temperature field may be the direct cause for producing and continuing a tornado. And a method to make tornado weak or even disappear was proposed, that is, destroying the temperature field.

Key words: computational fluid dynamics (CFD), tornado, numerical simulation, convergence heat transfer principle, temperature field