代数応力モデルを借用したk-εモデルによる曲円管内乱流の解析

抄録

The velocity profile and the distribution of the turbulent stresses in a curved tube drastically differ from the simple profiles in a straight tube due to the secondary flow induced by the centrifugal force. Characteristics of this complex flow are numerically analyzed by using the modified k-ε turbulent model equation combined with the algebraic stress model. Two important Reynolds stresses can be determined from the algebraic turbulent stress equations. They are closely related to the turbulent generation. The proposed model includes a new coefficient which should become zero in the ordinary k-ε model. Its value is determined so that numerical results might agree with the experimental results.