Modelling turbulent flow past a circular cylinder by RANS, URANS, LES and DES

Benim, Ali Cemal; Pasqualotto, Eleonora Bedin; Suh, Sang Hyun

doi:10.1504/pcfd.2008.019483

Cited by 43 publications

(27 citation statements)

References 25 publications

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“…For both comparisons, it is evident that the URANS solution tends to predict higher mean pressure coefficients within the wake region surrounding θ = 180° than those obtained experimentally. This trend has been identified in other studies comparing both URANS to higher-order computational methods as well as experimental studies (Hedges et al, 2002;Bayraktar et al, 2012;Benim et al, 2005Benim et al, , 2008. Comparing the data included from Lazos (2002a), flow separation along the centreline tends to occur earlier (θ ≈ 150° and 240°) with more asymmetric wake behaviour, indicating in agreement with (Lazos, 2002a(Lazos, , 2002b, that influence of the subsequent rear wheel is significant on the aerodynamics of the front wheel of a landing gear.…”

Section: Experimental Validation Of Computational Methodologysupporting

confidence: 76%

Computational investigation into the influence of yaw on the aerodynamics of an isolated wheel in free air

Kothalawala

Gatto

2016

IJCSE

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This paper details a computational investigation into the influence of yaw angle on the near and far-field aerodynamics of an isolated wheel in free air. Unsteady Reynolds-averaged Navier-Stokes was used as the primary analysis tool to analyse the complex flow features around this configuration, with principal vortical positions and magnitudes, overall lift, drag, and side force coefficients, as well as on-surface pressures characterised within the work presented. Fundamentally, the flow was found to be highly vortical in nature, particularly within the wake region of the wheel, with changes in yaw shown to have a significant impact on the surface flow, wake structure, as well as calculated force coefficients.

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Section: Experimental Validation Of Computational Methodologysupporting

confidence: 76%

Computational investigation into the influence of yaw on the aerodynamics of an isolated wheel in free air

Kothalawala

Gatto

2016

IJCSE

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“…The 46% difference in these C D values appears to be significant; however, this difference is in line with the results published for 2D CFD values of C D on a cylinder (Benim et al 2008). Benim et al (2008) used five different turbulence models to simulate flow past a cylinder. Those authors suggested that 2D unsteady turbulence models overpredict the C D .…”

Section: Resultssupporting

confidence: 84%

A Method for an Image‐Analysis‐Based Two‐Dimensional Computational Fluid Dynamics Simulation of Moving Fish

et al. 2012

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Studies involving how fish respond given different flow field conditions are important in understanding phenomena such as fish schooling as well as larger‐scale migrations. Simulating a fish moving under various flow field conditions is a difficult task, however, due to the fact that fish responses are dependent upon the environment. This makes the traditional use of analytical expressions to model the movement of fish bodies intractable. Thus, the main focus of the present study was to establish a method for coupling the use of image‐analysis‐based techniques for determining fish body motion with the use of a computational fluid dynamics (CFD) simulation. In particular, we focused on the simulation of a fish (rainbow trout Oncorhynchus mykiss) swimming behind a D‐section cylinder. This simulation was based on previous experiments that studied how vortices being shed from a blunt body affected fish movement. The individual frames of a video depicting a fish swimming behind a D‐section cylinder were segmented, and the resulting x, y coordinates of the fish's body were supplied to a CFD simulation to capture the fish motion. The CFD simulations were performed by using a k– turbulence model to calculate the flow field. Previous experimental results showed that the fish traversed between the shedding vortices. Our computational results show that the propulsive force is greatest when the shedding vortices pass along the sides of the fish body in order to aid in its movement. Future work entails extending the analysis to three dimensions and including more details in the fish geometry.

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“…The transitional turbulence behaviour during transient process is still an issue under investigation. Some new RANS-based turbulence models were presented for separated flows (Jiang et al 2011), but the RANS models are not well suited for predicting transient effects of turbulent separated flow (Benim et al 2008). On the other hand, for transient flow simulation, the grid requirements for the description of Large Eddy Simulation (LES) are quite large.…”

Section: Computational Model and Boundary Conditionmentioning

confidence: 99%

A study on numerical methods for transient rotating flow induced by starting blades

Wu¹,

Chen²,

Sun³

et al. 2012

International Journal of Computational Fluid Dynamics

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Based on the finite volume method, three methods for rotational region treatment were presented and validated by simulating two-dimensional accelerating rotational flows. Separate transient incompressible flows induced by crossshaped blades during starting process were simulated using the dynamic mesh, sliding mesh and dynamic reference frame methods. The computing performance and stability of the three methods were evaluated by comparing numerical results, and the transient characteristics of the accelerating rotational flow were analysed numerically. Results showed that the starting process affected the flow structure and transient characteristics of the accelerating rotational flows. The sliding mesh method showed higher computational efficiency and accuracy compared with other methods, and could easily be extended to solve three-dimensional transient flows in hydraulic machineries under transient operations, such as start-up and shutdown.

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Modelling turbulent flow past a circular cylinder by RANS, URANS, LES and DES

Cited by 43 publications

References 25 publications

Computational investigation into the influence of yaw on the aerodynamics of an isolated wheel in free air

Computational investigation into the influence of yaw on the aerodynamics of an isolated wheel in free air

A Method for an Image‐Analysis‐Based Two‐Dimensional Computational Fluid Dynamics Simulation of Moving Fish

A study on numerical methods for transient rotating flow induced by starting blades

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