A223 離散渦法による円管内流れにおける渦輪の相互作用

概要

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To know the nonlinear characteristics of pipe flow, we simulate the flow as a sum of many vortex rings. As a preliminary study, interactions among many vortex rings in an inviscid pipe flow are studied using the discrete vortex method. The velocity components were found to fluctuate in an irregular manner. The mean velocities have the same profile at any downstream positions due to the cancellation of positive and negative votices. The energy spectrum of the present vortex ring system has slope about -3.0,which is in good agreement with that of the minus third power law of two-dimensional turbulent flow, and is quite close to that of our experimental result. It is expected that our simulated result can be applied to explain the mechanism of nonlinear vortex interaction in turbulent pipe flow.
日本流体力学会の論文
2002-07-23