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http://dx.doi.org/10.3744/SNAK.2019.56.6.507

Effects of Flow Acceleration on Drag Force and Wake Field of 2D Circular Cylinder  

Son, Hyun A (Department of Structural Systems & CAE, Chungbuk National University)
Lee, Sungsu (School of Civil Engineering, Chungbuk National University)
Cho, Seong Rak (Korea Research Institute of Ships and Ocean Engineering)
Publication Information
Journal of the Society of Naval Architects of Korea / v.56, no.6, 2019 , pp. 507-514 More about this Journal
Abstract
Computational studies of accelerating flow around 2D Circular Cylinder was performed to investigate characteristics of wake field and drag forces. Previous studies had revealed that drag on the cylindrical body in accelerating flow is much greater than that in the flow with constant velocity; however, the underlying physics on the drag increase has not been clearly investigated. In order to investigate the drag increase and its relationship with wake development, this study employed a finite-volume based CFD code, Fluent 13.0 with k-ω SST model for turbulence effects. Inflows are modeled with varied accelerations from 0.4905 to 9.81m/s2. The drag computed in the present study is in good agreement with previous studies, and clearly shows the increase compared to the drag on the body in the flow with constant velocity. The results also show that drag crisis observed at high Reynolds number in the case of the flow with constant velocity is also found in the case of accelerating flow. The analysis for wake and recirculation length shows that conventional vortex shedding does not occur even at high Reynolds number and the drag increase is larger at higher acceleration.
Keywords
Accelerating flow; Recirculation; Bluff body; Added mass;
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