Wake dynamics of a 3D curved cylinder in oblique flows
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Three-dimensional numerical simulations were performed to study the effects of flow direction and flow velocity on the flow regime behind a curved pipe represented by a curved circular cylinder. The cylinder is based on a previous study and consists of a quarter segment of a ring and a horizontal part at the end of the ring. The cylinder was rotated in the computational domain to examine five incident flow angles of 0e180 with 45 intervals at Reynolds numbers of 100 and 500. The detailed wake topologies represented by l2 criterion were captured using a Large Eddy Simulation (LES). The curved cylinder leads to different flow regimes along the span, which shows the three-dimensionality of the wake field. At a Reynolds number of 100, the shedding was suppressed after flow angle of 135, and oblique flow was observed at 90. At a Reynolds number of 500, vortex dislocation was detected at 90 and 135. These observations are in good agreement with the three-dimensionality of the wake field that arose due to the curved shape.
Abstract
Three-dimensional numerical simulations were performed to study the effects of flow direction and flow velocity on the flow regime behind a curved pipe represented by a curved circular cylinder. The cylinder is based on a previous study and consists of a quarter segment of a ring and a horizontal part at the end of the ring. The cylinder was rotated in the computational domain to examine five incident flow angles of 0e180 with 45 intervals at Reynolds numbers of 100 and 500. The detailed wake topologies represented by l2 criterion were captured using a Large Eddy Simulation (LES). The curved cylinder leads to different flow regimes along the span, which shows the three-dimensionality of the wake field. At a Reynolds number of 100, the shedding was suppressed after flow angle of 135, and oblique flow was observed at 90. At a Reynolds number of 500, vortex dislocation was detected at 90 and 135. These observations are in good agreement with the three-dimensionality of the wake field that arose due to the curved shape.
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