周期性振荡湍流的壁函数研究和数值实验

Development of Near Wall Function for Periodic Oscillating Turbulent Flow and Numerical Experiment

目前二阶湍流模式已被广泛运用于湍流的计算中,壁面和主湍流之间的近壁区通常采用壁函数来近似计算.目前通常采用的壁函数基于流动准稳态和充分发展等条件,对于周期性振荡湍流这类非定常湍流已不适应.本文基于周期性振荡湍流条件,推导了适用于周期性振荡湍流条件的近壁函数.采用K-ε模式,结合本文推导的周期性振荡湍流近壁函数,计算了一个二维直管周期振荡湍流流场,计算结果表明用本文推导的周期性振荡湍流近壁函数所得结果与实验结果相符.

In this paper, a new wall function is derived on the condition of periodic oscillating tubulent flow. Combined with k -ε turbulent model, the newly developed wall function is employed to compute a two-dimensional periodicly oscillating turbulent flow. The numerical results show fairly well fitting the result of experiment.