INFLUENCE OF REYNOLDS NUMBER IN SEABED PROXIMITY IN STUDY OF FLOW AROUND A CIRCULAR CYLINDER

Leonardo Luiz Veiga Rodrigues, Patrícia Habib Hallak

Resumo


Flexible risers, widely used in offshore engineering, are long multilayer tubes designed to carry fluid — such as oil and natural gas — from the seabed to the sea platforms. In this work, the fluid passage was evaluated in a uniform flow around the cross-section of the tube in a two-dimensional analysis. The seasonality and variation of sea currents over time make it necessary to study different flow regimes. Therefore, a variation of Reynolds number and type of flow is applied, thus obtaining results for the laminar regime. In the flow around an obstacle is interesting the study of the vortex shedding, fluid oscillations, drag and lift force and Strouhal number. Therefore, these parameters for two Reynolds numbers in the laminar regime are obtained through modeling using computational fluid dynamics software, ANSYSR© Fluent, and then compared with the results of other models in the literature. The influence of seabed proximity, that is, the vertical position of the riser was investigated.  Thus, the coefficients are obtained as a function of the distance. It could be observed that as the cylinder approaches the seabed, the values of coefficients varied significantly for both Reynolds number values studied, with some difference between them.

Palavras-chave


Vortex shedding; Laminar flow; Flexible risers; Computational fluid dynamic

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DOI: http://dx.doi.org/10.21575/25254782rmetg2020vol5n21167

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Direitos autorais 2020 Leonardo Luiz Veiga Rodrigues, Patrícia Habib Hallak

Revista Mundi Engenharia, Tecnologia e Gestão ISSN 2525-4782

Qualis: B4 - Interdisciplinar, B5 - Geografia, B5 - Administração Pública e de Empresas, Ciências Contábeis e Turismo, B5 - Comunicação e Informação, B5 - Engenharias III