k-ε模型中紊动扩散系数的修改及验证  

Modification and the Verification of Turbulent Diffusion Coefficient in κ-ε Model

作　　者：赵振祥[1] 张书农[2] 

机构地区：[1]常州市环境保护研究所 [2]河海大学环境水利研究所

出　　处：《河海大学学报（自然科学版）》1992年第1期65-71,共7页Journal of Hohai University(Natural Sciences)

摘　　要：本文用环境水力学方法推求污染带内的紊动扩散系数,代替标准k-ε紊流模型中的紊动扩散系数Γ=v_t/V_t,试图克服k-ε紊流模型中紊动扩散系数假定为各向同性的缺陷。用两种方法确定的紊动扩散系数分别代入扩散方程进行数值模拟,并与实测资料进行了比较。结果表明,环境水力学方法所确定的紊动扩散系数更符合实测资料。The turbulent diffusion coefficient can be deduced from the method of environmental by- dromechanics,and it is used to replace the original one in the k-ε model.The objective is to try to avoid the defect that the turbulent diffusion coefficient is supposed to be isotropic.The numerical re- sults obtained using the two kinds of turbulent diffusion coefficients are compared with the observed data and it has been found that the agreement is better if the turbulent diffusion coefficient deduced from the method of environmental hydromechanics is used.

关 键 词：紊流模型 紊动扩散系数 岸边排放 k-ε模型 数值模拟 

分 类 号：TV131.21[水利工程—水力学及河流动力学]