Water-Tank Studies of Separating Flow Over Rough Hills |
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| Authors: | J B R Loureiro A S Monteiro F T Pinho A P Silva Freire |
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| Institution: | 1.Programa de Engenharia Mecanica (COPPE/UFRJ),Universidade Federal do Rio de Janeiro,Rio de Janeiro,Brazil;2.Divis?o de Metrologia Científica e Industrial,Instituto Nacional de Metrologia (INMETRO),Rio de Janeiro,Brazil;3.Centro de Estudos de Fenómenos de Transporte,Faculdade de Engenharia da Universidade do Porto,Porto,Portugal;4.Universidade do Minho,Braga,Portugal |
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| Abstract: | The present work investigates the lower boundary condition for flows over a steep, rough hill. Simple asymptotic arguments
together with the mixing-length hypothesis are used to derive a local analytical solution that is tested against three different
flow conditions. In all, 36 velocity profiles are compared with the proposed expression. The experiments were carried out
in a water channel and velocity measurements were made through laser Doppler anemometry. The extent of separated flow was
made to vary as a function of the roughness and the Reynolds number. The analysis includes regions of attached as well as
separated flow. In particular, the solution of Stratford is studied at the points of separation and re-attachment and found
to apply equally well in rough walls. |
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| Keywords: | Hill Law of the wall Roughness Separation |
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