Numerical investigation of transitions in flow states and variation in aerodynamic forces for flow around square cylinders arranged inline

Abbasi, Waqas Sarwar; Islam, Shams Ul; Faiz, Lubna; Rahman, Hamid

doi:10.1016/j.cja.2018.08.020

Cited by 18 publications

(9 citation statements)

References 33 publications

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“…The body of electric drive (4) is installed on the bearing (5) fixed on frame (1), which makes it possible to measure torque upon readings of the scales (7). Pressure at inlet and outlet is determined upon readings of the pressure gauges (15,17). Supply of pump test sample is determined by weight method by the change in the indication of the scales (8).…”

Section: Methodsmentioning

confidence: 99%

“…A more detailed study of gas flows in channels of different geometry is required since increasing the efficiency of technological processes is inextricably linked to solving many optimization problems [15,16]. For example, a problem describing gas flows when flowing around a set of cylinders [17], which can form a grid or a permeable mesh structure, can be considered. Mechanical systems with certain response speed limits to control signals and commands are usually used to control gas flows [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

et al. 2021

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This paper presents a scientific development aimed at improving the efficiency of turbomachines through the joint use of rotary-vane and vortex workflows. In the well-known Euler turbine, the rotor flow channels represent a set of curved pipes. The authors propose to consider in more detail the possibilities of using such rotating pipes in the implementation of an ejection (vortex) workflow. A hybrid pump was considered with the conclusion that its workflow can be described using two Euler equations. The results of computer simulation indicate that hybrid turbomachines are promising. The use of additive technology allowed the creation of micromodels of the Euler turbine with various rotor designs. Laboratory hydraulic tests showed that the liquid inlet to the rotor is possible in pulse mode. Laboratory tests of micromodels using compressed air showed that gas (or liquid) motion through curved pipes could be carried out from the rotor periphery to its center and then back, albeit through another curved pipe. The research results demonstrated that the scientific and technical potential of the Euler turbine is not yet fully unlocked, and research in this direction should continue. The study results are applicable in various industries including the energyeconomy, robotics, aviation, and water transport industries.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

et al. 2021

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“…In addition, they noted that the g/D is the important analysis parameter. Abbasi et al [5] analyzed the flow regime transitions around two-, three-and four-tandem cylinders for Re ranging from 1 to 130 at g/D � 2 and 5. ey observed two separate trends in terms of flow transitions for g/D � 2 and 5. e more reduction in terms of drag is observed at g/D � 2. Mittal et al [6] numerically analyzed the flow characteristics through two cylinders for Re � 100 and 1000 and found that the shedding starts at Re � 100.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics and Fluid Forces Reduction of Flow Past Two Tandem Cylinders in Presence of Attached Splitter Plate

Ahmed

Wahid

Manzoor

et al. 2021

Mathematical Problems in Engineering

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Numerical simulations are carried out to study the flow around two tandem square cylinders (SC) under the effect of spacing ratio(g/D) and splitter plate length (l/D) for a fixed Reynolds number (Re) = 100. The g/D is varied from 0 to 10 and l/D is varied from 0.5 to 10. The splitter plate length is found to have strong effect on vortex shedding and fluid forces. The maximum reduction in mean drag coefficient is observed at l/D = 8, that is 15% and 78% for upstream and downstream cylinders, respectively. The maximum reduction in root-mean-square value of lift coefficient is found at l/D = 10, that is 99%. The flow pattern at both of these points is steady flow. There is 100% vortex shedding suppression for l/D > 5. The observed flow patterns for flow past tandem cylinders without splitter plate are; single bluff body (SBB), steady flow (SF), quasi-steady flow (QSF), fully developed flow (FDF) and fully developed two-row vortex street flow (FDTRVS) regimes. SBB, QSF and SF regimes were observed in presence of splitter plate.

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“…Zdanski and Vaz [33] have implemented a secondorder finite difference scheme to simulate a flow problem of incompressible 3D viscous fluid flow in a channel. Abbasi et al [34] have numerically analyzed the impacts of hydrodynamic forces over a cylinder-based Lattice Boltzmann Method (LBM) at low Reynolds number. Also, they compared their results with numerical and experimental data for single square cylinder case.…”

Section: Introductionmentioning

confidence: 99%

Topological Characteristics of Obstacles and Nonlinear Rheological Fluid Flow in Presence of Insulated Fins: A Fluid Force Reduction Study

Majeed

Jarad

Rasheed

et al. 2021

Mathematical Problems in Engineering

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In this work, a comprehensive study of fluid forces and thermal analysis of two-dimensional, laminar, and incompressible complex (power law, Bingham, and Herschel–Bulkley) fluid flow over a topological cross-sectional cylinder (square, hexagon, and circle) in channel have been computationally done by using finite element technique. The characteristics of nonlinear flow for varying ranges of power law index 0.4 ≤ n ≤ 1.6 , Bingham number 0 ≤ Bn ≤ 50 , Prandtl number 0.7 ≤ Pr ≤ 10 , Reynolds number 10 ≤ Re ≤ 50 , and Grashof number 1 ≤ Gr ≤ 10 have been examined. Considerable evaluation for thermal flow field in the form of dimensionless velocity profile, isotherms, drag and lift coefficients, and average Nusselt number Nu avg is done. Also, for a range of Bn , the drag forces reduction is observed for circular and hexagonal obstacles in comparison with the square cylinder. At Bn = 0 corresponding to Newtonian fluid, maximum reduction in drag force is reported.

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Numerical investigation of transitions in flow states and variation in aerodynamic forces for flow around square cylinders arranged inline

Cited by 18 publications

References 33 publications

Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine

Flow Characteristics and Fluid Forces Reduction of Flow Past Two Tandem Cylinders in Presence of Attached Splitter Plate

Topological Characteristics of Obstacles and Nonlinear Rheological Fluid Flow in Presence of Insulated Fins: A Fluid Force Reduction Study

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