急発進する二次元回転円柱まわりの低レイノルズ数流れ : 定常流れへの収束性について(流体工学,流体機械)

概要

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This paper treats transient low Reynolds number flows around (1) an impulsively started rotating circular cylinder and (2) an impulsively started and rotated circular cylinder. The main purpose of this paper is to discuss the difference between the two initial cases for large enough time and to know the asymptotic behavior of the transient flow to the steady flow as time to infinity. In the two-dimensional flow, the transient flow is determined uniquely by the initial condition, however, there are several initial flows, which are considered to approach the same steady flow as time to infinity. Thus, it is an interesting problem to know the asymptotic behaviors of the above mentioned two initial cases as time to infinity. The present paper shows that the convergence to the steady flow in the case (2) is, at most, of order of T^-3/2 where T is the stretched time.
社団法人日本機械学会の論文
2002-02-25