シェルピンスキー四面体後流の混合距離

抄録

Eddy viscosity and mixing length in the wake behind the Sierpinski tetrahedral structure have been investigated. The Sierpinski tetrahedron is considered the model of a crown tree. Two cases are examined. One is the case where the Sierpinski structure completely covered the cross-section of the test duct (internal flow). The other is the case where the wall of the test duct is away from the Sierpinski strcture (external flow). In both cases, the turbulence generated weakened with the interation number of the structure. It is found that the mixing length scale is maily determined by the size of the smallest tetrahedron in the Sierpinski structure.