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SR13 Mecānica dos Fluidos |
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Title:
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LARGE ARTIFICIALLY GENERATED TURBULENT BOUNDARY LAYERS FOR THE STUDY OF ATMOSPHERIC FLOWS
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Summary :
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THE PRESENT WORK DISCUSSES IN DETAIL THE EXPERIMENTAL CONDITIONS FOR THE ESTABLISHMENT OF THICK ARTIFICIALLY GENERATED TURBULENT BOUNDARY LAYER WHICH CAN BE CLASSIFIED AS HAVING THE NEAR CHARACTERISTICS OF AN ATMOSPHERIC BOUNDARY LAYER. THE PAPER DESCRIBES THE EXPERIMENTAL ARRANGEMENT, INCLUDING THE FEATURES OF THE DESIGNED WIND TUNNEL AND OF THE INSTRUMENTATION. THE BOUNDARY LAYER IS MADE TO DEVELOP OVER A SURFACE FITTED WITH WEDGE GENERATORS WHICH ARE USED TO YIELD A VERY THICK BOUNDARY LAYER. THE FLOW CONDITIONS WERE VALIDATED AGAINST THE FOLLOWING FEATURES: GROWTH, STRUCTURE, EQUILIBRIUM AND TURBULENT TRANSPORT MOMENTUM. RESULTS ARE PRESENTED FOR THE FOLLOWING MAIN FLOW VARIABLES: MEAN VELOCITY, LOCAL SKIN-FRICTION COEFFICIENT, BOUNDARY LAYER MOMENTUM THICKNESSES AND THE CLAUSER FACTOR. THE VELOCITY BOUNDARY LAYER CHARACTERISTICS WERE SHOWN TO BE IN GOOD AGREEMENT WITH THE EXPECTED TREND IN VIEW OF THE CLASSICAL EXPRESSIONS FOUND IN LITERATURE.
KEY WORDS - TURBULENCE, ROUGHNESS, BOUNDARY LAYER, ATMOSPHERIC FLOWS}
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Author :
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Guimarćes, Joćo Henrique D.
Jian, Su 0
Santos Jr., Sergio J. F.
Silva Freire, Atila Pantalećo
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Paper View :
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