条件付抽出法による吹出しを伴うチャネル乱流の組織的構造の解析

抄録

An organized structure in a fully developed turbulent channel flow with uniform injection is investigated using conditional sampling techniques. Mean frequency and duration time of bursting are obtained using the VITA method. The contributions to uv in the four quadrants of the u-v plane are examined by means of the quadrant analysis technique. The frequency and duration time of bursting increase with increasing injection rate. The contribution of the sweep to Reynolds shear stress increases near the wall region. In the core region of the channel, the contribution of the ejection increases. These results are consistent with the finding that the Reynolds shear stress increases due to injection.