湍流模式——研究现状与发展趋势

随着人们对湍流运动的物理认识的深入,湍流模式的研究近年来有了长足进展,以线性的涡粘性和二阶矩闭合模式发展到非线性的描述,以模式系数的经验标定进入了理性推导。传统上湍流模式建立在连续介质力学理论基础上,目前统计力学方法也被成功地应用于模式的研究,如概率密度函数方法和重整化群理论等。本文除介绍和讨论了目前工程应用中常见的一些湍流模式外,还就作者本人的研究体会探讨了湍流模式的研究动向和发展趋势。

TURBULENCE MODELS: PRESENT STATUS AND FUTURE DEVELOPEMENT

Dver the last two decades of intense research and application activities,turbulence modelling still remains as one of the frontier problems in morden fluid dynamics. On the one hand, major progress in the second-moment closure of the Reynolds stresses has been achieved that it demonstrated convincing ability to capture complex turbulence behavior which the conventional Boussinesq viscosity hypothesis fails badly to mimick. On the other hand, however, researchers have not yet agreed on the " best" version of the second-moment closure model, generality of the model applicability still deffers from case to case. This article , thus, intends to give a panoramic presentation on the turbulenceomodelling develope-ment. Emphasis will concentrates on the nonlinear modelling practice which has become a research focal point and represents the major achievement over the last few years. The nolinear developemnet has taken place both in the field of the second-moment closure and in the eddy-viscosity concept. Discussion will be provided in detail including the writer's research experience.