Drag reduction by dimples?: A complementary experimental/numerical investigation

被引:63
作者
Lienhart, Hermann [1 ]
Breuer, Michael [1 ]
Koeksoy, Cagatay [1 ]
机构
[1] Univ Erlangen Nurnberg, Inst Fluid Mech, D-91058 Erlangen, Germany
关键词
dimples; drag reduction; skin-friction drag; measurements; direct numerical simulation (DNS);
D O I
10.1016/j.ijheatfluidflow.2008.02.001
中图分类号
O414.1 [热力学];
学科分类号
摘要
The paper is concerned with an experimental and numerical investigation of the turbulent flow over dimpled surfaces. Shallow dimples distributed regularly over the wall of a plane channel with large aspect ratio are used to study their effect on the friction drag. The resulting pressure drop in the channel was measured for smooth and dimpled walls. In addition to these investigations on internal flows, an external flow study was performed and boundary-layer profiles were measured using a Pitot-tube rake. Complementary to the measurements, direct numerical simulations for the internal flow configuration with and without dimples were carried out, for two different grid resolutions and analyzed in detail. The objective was to clarify whether or not dimples cause reduction of the skin-friction drag. (C) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码:783 / 791
页数:9
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