Abstract
Abstract The effects of surface roughness on a turbulent boundary layer (TBL) were investigated using particle image velocimetry (PIV). The roughness elements used were periodically arranged two-dimensional spanwise rods, and the roughness height was . Introduction of the roughness elements increased the wake strength and the turbulent stress not only in the roughness sublayer but also in the outer layer. This indicates the existence of interaction between inner and outer layers for 2D rod-roughened wall. Roughness effects on a turbulence structure near the wall were obtained by PIV measurements. Iso-contours of mean velocities and Reynolds stresses in the roughness sublayer showed a very good agreement with previous DNS results. † 책임저자, 회원, 한국과학기술원 기계공학과 E-mail : hjsung@kaist.ac.kr TEL : (042)869-3027 FAX : (042)869-5027 * 한국과학기술원 기계공학과 ** 현대중공업 선박저항추진 연구실 *** 한국해양대학교 기계정보공학부 기호설명 : 표면조도 높이 : 유효사조도높이 : 레이놀즈수 ∞ : 주유동방향 평균속도 : 무차원 속도
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