A Lagrangian roughness model integrated with the vortex method for drag coefficient estimation and flow control investigations around circular cylinder for a wide range of Reynolds numbers

Oliveira, Marcos André de; Pereira, Luiz Antonio Alcântara

doi:10.1007/s40430-022-03605-9

Cited by 4 publications

(18 citation statements)

References 59 publications

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“…In fluid-structure interactions, surface roughness (passive technique) can control the dynamics of vortex shedding by inducing suppression. The flow modification can be quantified in terms of the variation in hydrodynamic forces and vortex shedding frequency [15]. However, the flow in rough cylindrical bodies requires further investigation [16].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Oliveira and Alcântara Pereira [15] proposed a new technique to change the cutoff width of the vorticity characteristic distribution as a function of the Reynolds number, because until then, there was a significant overestimation of the drag coefficient [40] of the single circular cylinder for Reynolds numbers from the upper range of the subcritical regime [1]. This did not allow the capture of the drag crisis when applying the DVM.…”

Section: Introductionmentioning

confidence: 99%

“…This did not allow the capture of the drag crisis when applying the DVM. Greater difficulties have been observed for simulations in the critical and supercritical regimes, highlighting the high sensitivity of the flow to small fluctuations in turbulence [15,38,40].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the Lagrangian Dynamic Roughness Model (MLDR VL ) with Large Eddy Simulation (LES) was extensively tested by Oliveira and Alcântara Pereira [15], and the results compared with the experimental results of Achenbach [29], Fage and Warsap [41], and Blevins [42], mainly to predict the drag crisis in rough circular cylinders in the Reynolds number range 2 × 10 4 ≤ Re ≤ 6 × 10 5 . The MLDR VL was proposed to impose refined boundary layer conditions with the simultaneous contribution of rough geometry constructed with uniform triangular elements and a small-scale momentum injection near the wall.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this study was to adapt the model of Oliveira and Alcântara Pereira [15] to demonstrate a turbulence control technique for a Large Eddy Simulation combined with the Discrete Vortex Method. The new technique was then applied to capture the vortex shedding suppression from a surface cylinder with different roughness heights, namely 0.00110 ≤ ε/D ≤ 0.02.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Roughness on Aerodynamic Loads of Bluff Body in Vicinity of Smoothed Moving Wall

Oliveira,

Alcântara Pereira

2024

Applied Sciences

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This paper contributes to a new Lagrangian vortex method for the statistical control of turbulence in two-dimensional flow configurations around a rough circular cylinder in ground effect when considering higher subcritical Reynolds numbers, namely 3 × 104 ≤ Re ≤ 2 × 105. A smoothed moving wall (active control technique) is used to include the blockage effect in association with the variation in cylinder surface roughness (passive control technique), characterizing a hybrid approach. In contrast with the previous approaches of our research group, the rough cylinder surface is here geometrically constructed, and a new momentum source term is introduced and calculated for the investigated problem. The methodology is structured by coupling the random Discrete Vortex Method, the Lagrangian Dynamic Roughness Model, and the Large Eddy Simulation with turbulence closure using the truncated Second-Order Velocity Structure Function model. This methodological option has the advantage of dispensing with the use of both a refined near-wall mesh and wall functions. The disadvantage of costly processing is readily solved with Open Multi-Processing. The results reveal that intermediate and high roughness values are most efficient for Reynolds numbers on the orders of 105 and 104, respectively. In employing a moving wall, the transition from the large-gap to the intermediate-gap regime is satisfactorily characterized. For the conditions studied with the hybrid technique, it was concluded that the effect of roughness is preponderant and acts to anticipate the characteristics of a lower gap-to-diameter ratio regime, especially with regard to intermittency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Surface Roughness on Aerodynamic Loads of Bluff Body in Vicinity of Smoothed Moving Wall

Oliveira,

Alcântara Pereira

2024

Applied Sciences

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Time and frequency analysis of fluctuating hydrodynamic forces acting on circular and square cylinders in laminar flows

Kiyoumarsioskouei

Osguei

2023

J Braz. Soc. Mech. Sci. Eng.

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Wing tip vortices dynamics with crosswind effect using the large eddy simulation (LES) theory

De Oliveira,

De Moraes,

Pereira

et al. 2023

Cad. Pedagógico

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In the operational control of airports it is imperative to reduce the interval between landing and takeoff operations. To this end, it is necessary to address the risk of aircraft vortex wake encounter during these operations. This paper describes a refined numerical method developed to study the phenomenon of aircraft vortex wake interaction with the airport runway, employing the Lagrangian approach with accelerated processing by parallel computing.The numerical methodology relies on a vortex method incorporating the Large Eddy Simulation (LES) theory for the two-dimensional domain.The Image method is used to guarantee the condition of impenetrability on the airport runway. In this context, open multiprocessing (OpenMP) and an algorithm that subdivides the fluid domain into box structures to expedite the calculation of eddy viscosity locally are used in a Fortran code. Quantitative and qualitative results are presented at various Reynolds numbers, in dimensionless crosswind conditions. In addition, preliminary results are presented for a Boeing 757-200, representative of practical aviation problems. The results are in agreement with experimental results and other numerical simulations. It is possible to satisfactorily capture the centroid trajectories of the vortical structures shed from the wingtips, the temporal deformation of these structures, as well as the dynamics of the primary and secondary structures in interaction with the airport runway.

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A Lagrangian roughness model integrated with the vortex method for drag coefficient estimation and flow control investigations around circular cylinder for a wide range of Reynolds numbers

Cited by 4 publications

References 59 publications

Effect of Surface Roughness on Aerodynamic Loads of Bluff Body in Vicinity of Smoothed Moving Wall

Effect of Surface Roughness on Aerodynamic Loads of Bluff Body in Vicinity of Smoothed Moving Wall

Time and frequency analysis of fluctuating hydrodynamic forces acting on circular and square cylinders in laminar flows

Wing tip vortices dynamics with crosswind effect using the large eddy simulation (LES) theory

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