Numerical simulation of a 5:1 rectangular cylinder at non-null angles of attack

Patruno, L.; Ricci, M.; Miranda, Stefano de; Ubertini, Francesco

doi:10.1016/j.jweia.2016.01.008

Cited by 52 publications

(21 citation statements)

References 22 publications

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“…To assess the validity of URANS with the k-ω SST turbulence model for flow around twin-box girder bridge cross section, a comparison has been carried out between the present simulations and the wind tunnel test results from [18]. The time-averaged aerodynamic quantities such as C D , C L and C M , in the range of AoA from −10.0 • to +10.2 • at Re = 31,000 are studied, see Figure 5.…”

Section: Validation Of Numerical Modelmentioning

confidence: 99%

“…The application of a 2D unsteady Reynolds-averaged Navier-Stokes (URANS) model for flow around simple rectangular geometry has been validated thoroughly in previous research [14][15][16][17][18]. Mannini et al [16] applied 2D URANS equations with advanced turbulence modeling closures for [17] conducted CFD simulation for the same structure at high Re numbers (5 × 10 5 , 1 × 10 6 , 1.5 × 10 6 and 2 × 10 6 ) using the 2D URANS together with the standard high Reynolds number k-ω model.…”

Section: Introductionmentioning

confidence: 99%

“…For engineering design purposes, it gave reasonably good agreements with the published experimental data in terms of time-averaged drag coefficients, Strouhal numbers and time-averaged base pressure coefficient. Patruno et al [18] studied the flow field around the 5:1 rectangular cylinder with an angle of attack of 0 to 4 degrees using both Large Eddy Simulation (LES) and URANS (i.e., k-ω shear stress transport (SST)) turbulence models. They found that LES and URANS approaches appeared to provide comparable results in terms of accuracy of first and second order pressure statistics measured at the central section of the considered prism.…”

Section: Introductionmentioning

confidence: 99%

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Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

et al. 2019

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The aerodynamic performance of bridge deck girders requires a thorough assessment and optimization in the design of long-span bridges. The present paper describes a numerical investigation of the aerodynamic characteristics of a twin-box bridge girder cross section in the range of angles of attack between −10.0° and +10.2°. The simulations are performed by solving 2D unsteady Reynolds-averaged Navier–Stokes (URANS) equations together with the k–ω shear stress transport (SST) turbulence model. The investigated Reynolds number (Re) based on the free stream velocity ( U ∞ ) and the height of the deck (D) is 31,000. The predicted aerodynamic characteristics such as the mean drag, lift and moment coefficients, are generally in good agreement with the results from the wind tunnel tests. Changes of flow patterns and aerodynamic forces with different angles of attack are investigated. Flow characteristics during one vortex shedding period are highlighted. Relative contributions of each of the two bridge decks to the overall drag and lift coefficients, with respect to the angle of attack, are also discussed.

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Section: Validation Of Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

et al. 2019

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“…Creation and genetic breeding of random individuals. [8,10,11,13,14,15] (1) Evidence of response under parameter variation. (1) It is not fully automated.…”

Section: Approachmentioning

confidence: 99%

Wing profile evolution driven by computational fluid dynamics

Rendon-Cardona¹,

Hernandez²,

Ruiz-Salguero³

2019

revuin

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In the domain of fluid dynamics, the problem of shape optimization is relevant because is essential to increase lift and reduce drag forces on a body immersed in a fluid. The current state of the art in this aspect consists of two variants: (1) evolution from an initial guess, using optimization to achieve a very specific effect, (2) creation and genetic breeding of random individuals. These approaches achieve optimal shapes and evidence of response under parameter variation. Their disadvantages are the need of an approximated solution and / or the trial-and-error generation of individuals. In response to this situation, this manuscript presents a method which uses Fluid Mechanics indicators (e.g. streamline curvature, pressure difference, zero velocity neighborhoods) to directly drive the evolution of the individual (in this case a wing profile). This pragmatic strategy mimics what an artisan (knowledgeable in a specific technical domain) effects to improve the shape. Our approach is not general, and it is not fully automated. However, it shows to efficiently reach wing profiles with the desired performance. Our approach shows the advantage of application domain-specific rules to drive the optimization, in contrast with generic administration of the evolution.

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“…Although the majority of these studies have focused on studying the cross-flow past bluff bodies such as cylinders of circular [1][2][3][4][5][6], elliptic [7][8][9][10], rectangular [11][12][13][14][15] and square cross-sections [16][17][18][19][20], there are fewer studies on the semicircular cylinder geometry [21][22][23][24]. Gode et al [25] studied numerically the momentum and heat transfer characteristics of a two-dimensional (2D), incompressible and steady flow over a semicircular cylinder and pointed out that the wake ceases to be steady somewhere in the range of 120 ≤ Re ≤ 130.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Mixed Convection from Two Isothermal Semicircular Cylinders in Tandem Arrangement

Salcedo¹,

Treviño²,

Cajas³

et al. 2017

Heat Exchangers - Design, Experiment and Simulation

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In this chapter, two-dimensional mixed convection heat transfer in a laminar cross-flow from two heated isothermal semicircular cylinders in tandem arrangement with their curved surfaces facing the oncoming flow and confined in a channel is studied numerically. The governing equations are solved using the control-volume method on a nonuniform orthogonal Cartesian grid. Using the immersed-boundary method for fixed Reynolds number of Re D ¼ u D D=υ ¼ 200, Prandtl number of Pr ¼ 7, blockage ratio of BR ¼ D=H ¼ 0:2 and nondimensional pitch ratio of σ ¼ L=D ¼ 3, the influence of buoyancy and the confinement effect are studied for Richardson numbers in the range −1 ≤ Ri ≤ 1. Here, u D is the average longitudinal velocity based on the diameter of the semicylinder. The variation of the mean and instantaneous nondimensional velocity, vorticity and temperature distributions with Richardson number is presented along with the nondimensional oscillation frequencies (Strouhal numbers) and phase-space portraits of flow oscillation from each semicylinder. In addition, local and averaged Nusselt numbers over the surface of the semicylinders are also obtained. The results presented herein demonstrate how the buoyancy and wall confinement affect the wake structure, vortex dynamics and heat transfer characteristics.

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Numerical simulation of a 5:1 rectangular cylinder at non-null angles of attack

Cited by 52 publications

References 22 publications

Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

Wing profile evolution driven by computational fluid dynamics

Unsteady Mixed Convection from Two Isothermal Semicircular Cylinders in Tandem Arrangement

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