一様せん断流中における縦渦構造による運動量輸送

概要

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Direct numerical simulations(DNS) are carried out to investigate the kinematics of vortical structures in a homogeneous shear flow, and their association with the momentum transfer is studied in detail. The generated longitudinal vortices are conditionally averaged over all the computational region, and the effects of the non-linear term on them are studied by comparing the results of DNS with the prediction of rapid distortion theory (RDT). As a result, some important similarities are found in the vortical structure between the homogeneous shear flow and near-wall turbulence. It is also found that the strain rate in the vortical structure, which is markedly affected by the non-linear term, determines the transfer functions associated with the energy cascade of the turbulence.
一般社団法人日本機械学会の論文
1999-08-25