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- W832899388 abstract "This thesis examines the flow around bluff bodies placed at the floodplain edgein a compound, open channel. The floodplain edge location is associated with astrong shear layer between lower velocity floodplain flow and high velocity flow inthe main channel. The drag force exerted by a bluff body is dependant on the wayin which the flow separates around the body and subsequently recovers but thedrag coefficients typically used to represent the effects of bluff bodies are based onexperiments on bodies in geometrically simple channels. The differences inducedin the wake structures and therefore in the drag coefficients of bluff bodies whenthey are placed in the shear layer at the floodplain edge are little understood.In this study, experimental data is gathered that allows direct comparison of thewakes of identical bluff bodies, both emergent (surface-piercing) and submerged,in simple and compound open channels. For the compound channel scenarios,for both single and multiple block arrangements, turbulence data is also reported.These results are augmented using a computational model based on the solution ofthe 3D Reynolds Averaged Navier Stokes equations, using a non-linear turbulencemodel.The results show that the changes induced in the wake structures due to theirlocation at the floodplain edge of the compound channel can have a significanteffect on the drag coefficient. For the emergent bodies, the proximity of the deepmain channel flow is shown to impact in a complex manner upon the processes ofreattachment and re-separation, changing the formation of vorticity in the wake.For the submerged bodies, this is complicated by asymmetry in the same processeson the block top. For both body types, separation on the main channel side resultsin the creation of a strong axial circulation at the floodplain edge and the decayof the wake is asymmetrically affected by the differing behaviour of the turbulenceon the two sides." @default.
- W832899388 created "2016-06-24" @default.
- W832899388 creator A5004955666 @default.
- W832899388 date "2010-01-01" @default.
- W832899388 modified "2023-09-24" @default.
- W832899388 title "Turbulent flow around bluff bodies at the floodplain edge" @default.
- W832899388 hasPublicationYear "2010" @default.
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