Boundary Layer separation of an elliptic cylinder in a uniform shear flow

• Main Authors: Chien Li Chun, 簡立君
• Other Authors: Wu Tzu Yin
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/82164064226682650523

碩士 === 國立臺灣大學 === 機械工程學研究所 === 87 === The present research studies the separation of steady boundary-layer over an elliptic cylinder placed in a uniform shear flow. The boundary-layer equations are solved numerically via the conventional space-marching technique. Calculated result shows that in the condition of positive shear rate, with increasing the shear rate, there is not notable variation of the location of separation at the upper half of the elliptic cylinder. But the variation of the location of separation at the lower half of the elliptic cylinder is significant. When the shear rate increases beyond a critical value, separation point will jump from the rear part of the cylinder to the windward side of the cylinder and continue to move in the upstream direction. In the condition of negative shear rate, the jump phenomenon occurs at the upper half of the cylinder, and the variation of the location of separation at the lower half of the elliptic cylinder is not significant.