可視化の画像の数値的処理 : 続報,画像処理技術を適用した非定常静圧分布の測定

概要

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The digital image processing technique is applied to quantify flow visualization pictures showing unsteady 2-D wakes past a circular cylinder at Re=100. A combined use of suitable image input devices and newly developed computer programs makes it possible to automatically obtain instantaneous velocity fields from the corresponding streak line photographs. The resulting local velocity vectors are rearranged as Cartesian mesh points with a view to facilitating the following numerical processing. The estimation of the unsteady pressure field is done through iterating finite-difference calculation of 2-D Navier-Stokes equation, in which the unsteady terms are estimated from 3 slightly delayed continuous photographs. It turns out that the order of the unsteady terms is often larger than that of the viscous terms, or even of the inertial terms, in vortical regions, and that the introduction of the unsteady terms brings remarkable improvement in the precision of the pressure calculation.
社団法人日本機械学会の論文
1989-07-25