Investigation of the flow topology evolution between two tandem cylinders using a discontinuous Galerkin method Online publication date: Wed, 20-Dec-2023
by Xiangjun Shan; Fangjin Sun
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 24, No. 1, 2024
Abstract: A high-order discontinuous Galerkin method is used to study the transient behaviour of the flow between two cylinders in a tandem arrangement. A low Reynolds number of 200 and a pitch ratio of 3.7 are particularly employed, where a gradual transition process of the flow from reattachment flow to co-shedding flow is observed. The evolution of the flow topology in the gap between two cylinders, the transient surface pressure and the phase lag of the lift signal from reattachment flow to co-shedding flow are investigated, and the physical mechanism responsible for the flow transition is also discussed. The results show that the rolling up of the separated shear layer between two cylinders is closely related to the development of the gap flow. The gap flow is a unidirectional flow in the reattachment regime and gradually develops into a 'horseshoe-shaped' bidirectional flow when the flow transitions to the co-shedding regime.
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