Coherent Structure of a d-Type Rough Wall Boundary Layer in a Fully Rough Regime : Results with the Four-Quadrant Analysis

完全粗面領域におけるd形粗面境界層の組織構造 : 4象限分割法による解析

Coherent Structure of a d-Type Rough Wall Boundary Layer in a Fully Rough Regime : Results with the Four-Quadrant Analysis

Creators Mochizuki Shinsuke

Creators Osaka Hideo

Coherent Structure of a d-type rough wall boundary layer at a fully rough regime has been investigated with the four-quadrant analysis. Fractional stress contribution of the events associated with the bursting phenomenon was quantitatively analyzed and compared with the results at a low Reynolds number. The fractinal stress contribution of the second quadrant (ejection event) decresses with increasing the Reynolds number. The contribution of the violent events was studied and the significant difference of the turbulent structure among d-type rough, k-type rough and smooth wall flows was found.

[ISSN]0372-7661

[NCID]AN00244228