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EFFECTS OF ADVERSE PRESSURE GRADIENT ON A TURBULENT BOUNDARY LAYER

Joung-Ho Lee
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology;Corporate Research & Development Division Hyundai-Kia Motors 772-1 Jangduk-Dong, Hwaseong-Si, Gyeonggi-Do, 445-706, Korea

Hyung Jin Sung
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

Abstrakt

Direct numerical simulations were performed to investigate the physics of turbulent boundary layer flows subjected to adverse pressure gradient. A fully implicit fractional step method was employed to simulate the flows. To avoid generating an inflow with adverse pressure gradient, the sufficient streamwise length was placed from the inlet to the sudden change of free-stream velocity. The spatially-developing characteristics of turbulent boundary layer with adverse pressure gradient were examined. The present results were in good agreement with previous experimental ones. The visualization results showed that the adverse pressure gradient weakens the vortical structures. This causes a reduction in turbulence intensity near the wall.