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Calculation of Drag Coefficient for Arrays of Emergent Circular Cylinders with Pseudofluid Model

Cheng, Nian-Sheng

Journal of hydraulic engineering (New York, N.Y.), 2013-06, Vol.139 (6), p.602-611 [Periódico revisado por pares]

Reston, VA: American Society of Civil Engineers

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  • Título:
    Calculation of Drag Coefficient for Arrays of Emergent Circular Cylinders with Pseudofluid Model
  • Autor: Cheng, Nian-Sheng
  • Assuntos: Applied sciences ; Arrays ; Buildings. Public works ; Circular cylinders ; Computational fluid dynamics ; Cylinders ; Drag coefficients ; Exact sciences and technology ; Fluid flow ; Hydraulic constructions ; Parametrization ; Reynolds number ; Technical Papers
  • É parte de: Journal of hydraulic engineering (New York, N.Y.), 2013-06, Vol.139 (6), p.602-611
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: AbstractThe emergent vegetation in open-channel flows is usually simulated using arrays of circular cylinders in laboratory experiments. Analysis of recent experimental data reveals that for a given Reynolds number, the drag coefficient of a cylinder in a dense array is larger than that of an isolated cylinder. A new approach is applied to parameterize the drag coefficient and Reynolds number for flows through arrays of emergent cylinders. The approach is developed based on the concept of pseudofluid, for which an analogy is made between the cylinder-induced drag in an open-channel flow and that induced by the cylinder settling in a stationary fluid. With the proposed parameterization, the experimental database is successfully reorganized in such a way that a generalized drag coefficient is related to a generalized Reynolds number by one single curve, which is valid for a wide range of solid fractions and Reynolds numbers. However, it should be mentioned that only rigid circular stems are considered in this study and their induced drag is assumed to be dominant in comparison with the channel bed resistance.
  • Editor: Reston, VA: American Society of Civil Engineers
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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