近壁区理论耗散率模型的改进

提出了在边界层的近壁区,采用共振三波的理论模型描述湍流边界层相干结构,由此解决了对称三维波理论模型不能处理三阶相关量的问题,根据新的理论模型对ε方程逐项进行计算和分析.与原理论模型计算结果相比,本文理论结果与直接数值模拟(DNS)符合更好.

Improvement on the Theoretical Model for Dissipation-rate Budgets in Near-wall Region of a Turbulent Boundary Layer

A symmetric resonant triad theoretical model is proposed for the turbulent coherent structures in near wall region of a turbulent boundary layer,so the terms of triple correlation can be analyzed theoretically. In accordance with the new theoretical model, budgets of the dissipation rate of turbulent kinetic energy are calculated and its production rate, dissipation and transportation are evaluated. The new theoretical results are in better agreements with DNS than those by simple 3 D symmetric wave model. It shows that the theoretical method proposed could correctly embody the physical mechanism of near wall region turbulence and there is a possibility of opening a new way for near wall turbulence modeling.