主流が一方向流の乱流場の漸近解と境界条件

概要

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The near wall solution of k-ε type models is investigated analytically for unidirectional turbulent flow. It is classified into two kinds of asymptotic solutions. One is the wall function, known as the logarithmic law or wall law. Another is a solution which specifies a flow near the separation point. The magnitude of the friction velocity distinguishes the former solution from the latter. Many kinds of k-ε type models, which have these asymptotic solutions as a leading term for unidirectional turbulent flow, are possible. Among them, the standard k-ε model is one reasonable choice and the revised k-ε model is a more general model. Hence it is concluded that he wall function is consistent with the k-ε type model as a reasonable boundary condition for unidirectional flow, but that the region of the existing wall function is very narrow. So the boundary condition, which is widely applicable for unidirectional flow, is proposed using an asymptotic solution for unidirectional flow.
一般社団法人日本機械学会の論文
1989-09-25