Free Surface Characteristics of Flow around Two Side-by-Side Circular Cylinders

Li, Dengsong; Yang, Qing; Ma, Xudong; Dai, Guangqing

doi:10.3390/jmse6030075

Cited by 19 publications

(9 citation statements)

References 32 publications

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“…A zero value of F corresponds to a cell with no fluid, and a unit value indicates that the cell is full of water. A cell with an F value of between zero and one must contain a portion of the free surface [23,24]. The isosurface of F = 0.55 is defined as the free surface location.…”

Section: Numerical Methodologymentioning

confidence: 99%

Case Study on Application of the Step with Non-Uniform Heights at the Bottom Using a Numerical and Experimental Model

Yang

et al. 2018

Water

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Steps effectively dissipate the energy of water along a path and reduce the size of the stilling basin but are rarely used in curved spillways. The shore spillway of a reservoir, which is restricted by topography, must be arranged in a curved shape. At high flow velocity and low water depth, some areas of the base plate of the curved spillway were not covered by the water. The water flow into the stilling basin did not form a submerged hydraulic jump. It was proposed that a step with bottom non-uniform heights be placed in the smooth base plate of the curved spillway to improve these undesirable hydraulic phenomena. A physical model experiment with a length scale of 1:40 verified the feasibility of the curved stepped spillway in engineering. Based on the k-ε model and volume-of-fluid (VOF) method, a three-dimensional numerical model was established, and the reliability of the numerical model was verified by measured data. The main flow region, velocity field, cavitation on a step, and the energy loss rate of steps were discussed. The comparison between a curved spillway with and without steps shows that the steps balance the partial centrifugal force in the curved section, making the water depth of the cross-section evenly distributed, and the base plate was no longer covered by water. The flow pattern on the steps was skimming flow, and the velocity of the flow into the stilling basin was greatly reduced. The elevation of the concave bank of the base plate was raised, resulting in the formation of transverse flow, which in turn constituted a three-dimensional energy dissipation pattern with the longitudinal flow. The energy loss was significantly higher than that of the smooth curved spillway. However, the triangular region near to the concave bank on the base plate experienced negative pressure, and an aeration device in front of the steps was needed.

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Section: Numerical Methodologymentioning

confidence: 99%

Case Study on Application of the Step with Non-Uniform Heights at the Bottom Using a Numerical and Experimental Model

Yang

et al. 2018

Water

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“…Re D = 6000 Re D = 10, 000 for Re D = 10,000 at T/D between 1.5 and 1.75 [34], about which T/D = 1.7 in the present case falls within), the present numerical model overestimated their values in comparison to the experimental results in [37]. However, this difference in C d and C l with experimental results can be seen in all previous numerical studies reported in Table 4.…”

Section: T/dmentioning

confidence: 99%

Vibration Performance of a Flow Energy Converter behind Two Side-By-Side Cylinders

Rasani

Moria

Beer

et al. 2019

JMSE

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Flow-induced vibrations of a flexible cantilever plate, placed in various positions behind two side-by-side cylinders, were computationally investigated to determine optimal location for wake-excited energy harvesters. In the present study, the cylinders of equal diameter D were fixed at center-to-center gap ratio of T / D = 1 . 7 and immersed in sub-critical flow of Reynold number R e D = 10 , 000 . A three-dimensional Navier–Stokes flow solver in an Arbitrary Lagrangian–Eulerian (ALE) description was closely coupled to a non-linear finite element structural solver that was used to model the dynamics of a composite piezoelectric plate. The cantilever plate was fixed at several positions between 0 . 5 < x / D < 1 . 5 and - 0 . 85 < y / D < 0 . 85 measured from the center gap between cylinders, and their flow-induced oscillations were compiled and analyzed. The results indicate that flexible plates located at the centerline between the cylinder pairs experience the lowest mean amplitude of oscillation. Maximum overall amplitude in oscillation is predicted when flexible plates are located in the intermediate off-center region downstream of both cylinders. Present findings indicate potential to further maximize wake-induced energy harvesting plates by exploiting their favorable positioning in the wake region behind two side-by-side cylinders.

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“…A pair of vortexes in the wake of the two cylinders was observed, similar to the flow behind a cylinder. A similar flow is included in the work [19].…”

Section: Numerical Modelmentioning

confidence: 99%

Experimental and numerical analyses of airflow around two cylinders angled to the direction of wind

Padewska-Jurczak,

Szczepaniak,

Walentyński

2023

Bulletin of the Polish Academy of Sciences Technical Sciences

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The analyses aim to determine aerodynamic force coefficients in the case of airflow around two smooth or rough cylinders positioned at different angles to the direction of wind velocity. Such systems, for instance, may be part of a tubular water slide. The results were compared with the values of the interference coefficient of the cylinders arranged in a row included in Eurocode EN 1991 part 4. The aerodynamic forces of the cylinder systems were determined on the basis of experimental tests conducted in a wind tunnel. To verify the above results, CFD (computational fluid dynamics) simulations were prepared. An important observation is that for the angle of yaw β = 0 • , the negative component of the lift force (lateral) f y is shown, while for the other cases, the situation is opposite and the lateral force points outside the gap (upward). The second is that the results of aerodynamic drag for rough cylinders arranged in a row and calculated according to EN 1991 part 4 may be underestimated. The flow around the pair of smooth cylinders is quite different from that of the rough ones, because during the experiment the first falls into the critical flow regime, while the second has supercritical characteristics.

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Free Surface Characteristics of Flow around Two Side-by-Side Circular Cylinders

Cited by 19 publications

References 32 publications

Case Study on Application of the Step with Non-Uniform Heights at the Bottom Using a Numerical and Experimental Model

Case Study on Application of the Step with Non-Uniform Heights at the Bottom Using a Numerical and Experimental Model

Vibration Performance of a Flow Energy Converter behind Two Side-By-Side Cylinders

Experimental and numerical analyses of airflow around two cylinders angled to the direction of wind

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