应用三维代数应力通量模型模拟分层流

摘要

根据分层流紊动扩散能力在水平与垂直方向存在明显差异的特征，建立了三维代数应力通量模型.模型以有限体积法离散,SIMPLEC方法求解速度、压力和温度耦合方程组.对某分层流试验数值模拟计算表明,计算结果与实测值吻合良好;对于各向异性的分层流，代数应力通量模型与双方程k-ε模型相比，更好地保留与模拟了其基本物理特征，所得结果更趋合理.%A three-dimensional algebraic model for stress and scalar flux is established in this paper according to the characteristics of different turbulence diffusion in the horizontal and vertical direction of stratified flow. The coupled velocity, pressure and temperature equations are discretized by the finite volume method and solved by SIMPLEC method in this model. By the calculation for a stratified flow case, it is shown that the computed results are in good agreement with the experimental data. For the anisotropic stratified flow, the basic physical characteristics are retained and well reflected in the algebraic model for Reynolds stress and scalar flux compared with the two-equation k-ε turbulence model, indicating that the calculational results are reasonable.