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Computations have been carried out to investigate the influence of downstream cylinder rotation on coherent three-dimensional structures that develop in the wake of flow past in-line circular cylinders. A commercial flow solver based on finite volume method has been utilized for the simulations while the wake structures are characterised using iso-...
Two-dimensional flow past a square cylinder close to a free surface is studied numerically to investigate the effect of Froude numbers (0.0 0.6) and gap ratios (0.2–1.2) on the wake behavior and integral parameters. The multiphase approach with the modified volume of fluid method is employed to study the flow. InterFoam, a two-phase incompressible...
The correlation and extraction of coherent structures from a turbulent flow is a principle objective of data-driven modal decomposition techniques. The Conditional space-time Proper Orthogonal Decomposition (CPOD) offers insight into transient dynamics, revealing the causation of specific flow phenomenon - or events, in a customizable manner. This...
Our study involved an experimental investigation of a homogeneous bubble-swarm past a circular cylinder, of which the size is more than five times larger than that of a bubble, while varying the upstream volume void fraction, 〈α¯〉, in a small-to-moderate range and cylinder diameter, D. The Reynolds number of rising bubbles is approximately 103. We...
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... The method also employs a second-order center-difference scheme in space and a second-order accurate fractional-step method for time advancement. The code has been verified and applied in many flow-structure interaction problems [10][11][12][13][14][15][16]. ...
... The overall structure of the wake is different than the wake of a pitching-plunging plate [30] in which clear circular vortex loops were found. The wake in the present study is similar to the wake of a pitching-rolling plate [45] in which vortex rings are tilted more or less with sub-structures connecting them. The shape of the vortex rings (V1 and V3) generated by the upstroke flapping is more complex than those (V2 and V4) generated by the downstroke flapping (Figure 19). ...
... The overall structure of the wake is different than the wake of a pitchingplunging plate [30] in which clear circular vortex loops were found. The wake in the present study is similar to the wake of a pitching-rolling plate [45] in which vortex rings are tilted more or less with sub-structures connecting them. The shape of the vortex rings (V1 and V3) generated by the upstroke flapping is more complex than those (V2 and V4) generated by the downstroke flapping (Figure 19). ...
... The overall structure of the wake is different than the wake of a pitching-plunging plate [30] in which clear circular vortex loops were found. The wake in the present study is similar to the wake of a pitching-rolling plate [45] in which vortex rings are tilted more or less with sub-structures connecting them. The shape of the vortex rings (V1 and V3) generated by the upstroke flapping is more complex than those (V2 and V4) generated by the downstroke flapping (Figure 19). ...
... The overall structure of the wake is different than the wake of a pitchingplunging plate [30] in which clear circular vortex loops were found. The wake in the present study is similar to the wake of a pitching-rolling plate [45] in which vortex rings are tilted more or less with sub-structures connecting them. The shape of the vortex rings (V1 and V3) generated by the upstroke flapping is more complex than those (V2 and V4) generated by the downstroke flapping (Figure 19). ...
The manta is the largest marine organism to swim by dorsoventral oscillation (flapping) of the pectoral fins. The manta has been considered to swim with a high efficiency stroke, but this assertion has not been previously examined. The oscillatory swimming strokes of the manta were examined by detailing the kinematics of the pectoral fin movements swimming over a range of speeds and by analyzing simulations based on computational fluid dynamic potential flow and viscous models. These analyses showed that the fin movements are asymmetrical up- and downstrokes with both spanwise and chordwise waves interposed into the flapping motions. These motions produce complex three-dimensional flow patterns. The net thrust for propulsion was produced from the distal half of the fins. The vortex flow pattern and high propulsive efficiency of 89% were associated with Strouhal numbers within the optimal range (0.2–0.4) for rays swimming at routine and high speeds. Analysis of the swimming pattern of the manta provided a baseline for creation of a bio-inspired underwater vehicle, MantaBot.
... Additional details and solver validations for this code can be found in Ref. [14,15]. The current flow solver has also been used to model canonical rotational/flapping plates [16,17,18,19,20,21], the real insect flapping wings [22,23,24] and the pectoral fin of a bluegill sunfish [1,25]. ...
Bioinspired Structures and Design - edited by Wole Soboyejo September 2020
