A MIXING LENGTH MODEL FOR TURBULENT BOUNDARY-LAYERS OVER ROUGH SURFACES

被引:1
作者
HAN, LS [1 ]
机构
[1] LOCKHEED MISSILES & SPACE CO,DIV RES & DEV,PALO ALTO,CA 94304
关键词
D O I
10.1016/0017-9310(91)90216-2
中图分类号
O414.1 [热力学];
学科分类号
摘要
A methodology to analyze turbulent boundary layers over rough surfaces is developed. A new formulation of the mixing length model, expressed in the velocity variable, is instrumental in the modeling effort, and the surface roughness effect is embedded in an amplification factor as a multiplier to the mixing length. It ranges from unity for a smooth surface and varies upward for rough surfaces, depending on the type and magnitude of the roughness. The new method is demonstrated in the case of flow over a flat plate with two surface roughnesses. With a length Reynolds number of 10 million, the local skin friction is increased by as much as 60% when the ratio of roughness height to length is 1:10 000.
引用
收藏
页码:2053 / 2062
页数:10
相关论文
共 12 条
[1]  
[Anonymous], 1944, T AM SOC MECH ENG, DOI DOI 10.1115/1.4018140
[2]  
BAKHMETEFF BA, 1941, MECHANICS TURBULENT
[3]  
Cebeci T., 1974, ANAL TURBULENT BOUND
[4]   Experiments with fluid friction in roughened pipes [J].
Colebrook, CF ;
White, CM .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1937, 161 (A906) :367-381
[5]  
GRANVILLE PS, 1985, J SHIP RES, V29, P223
[6]  
Hama F., 1954, T SOC NAV ARCHIT MAR, V62, P333
[7]  
HEAZLER JM, 1974, AIAA74680 THERM HEAT
[8]   PRACTICAL CALCULATIONS OF TRANSITIONAL BOUNDARY-LAYERS [J].
MCDONALD, H ;
FISH, RW .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1973, 16 (09) :1729-1744
[9]   TURBULENT FLOW IN ROUGH PIPES [J].
ROBERTSON, JM ;
MARTIN, JD ;
BURKHART, TH .
INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS, 1968, 7 (02) :253-+
[10]  
SPALDING DB, 1961, J APPL MECH, V455