Comparative Assessment of Hybrid LES/RANS Models in Turbulent Flows Separating from Smooth Surfaces

Saric, Sanjin; Kniesner, Björn; Mehdizadeh, A.; Jakirlić, Suad; Hanjalić, K.; Tropea, Cameron

doi:10.1007/978-3-540-77815-8_15

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The grid resolution requirement in the wall-normal direction is high and lower in the direction parallel to the wall. Despite a few issues at the RANS-LES interface regarding the compatibility of the turbulence condition, this approach is considered competent in simulating several complex flow problems in the cited studies [165][166][167][168][169][170].…”

Section: Hybrid Rans-les Techniquesmentioning

confidence: 99%

Assessing aerodynamic loads on low-rise buildings considering Reynolds number and turbulence effects: a review

Khaled

Aly

2022

Adv. Aerodyn.

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This paper presents an extensive review of existing techniques used in estimating design wind pressures considering Reynolds number and turbulence effects, as well as a case study of a reference building investigated experimentally. We shed light on the limitations of current aerodynamic testing techniques, provisions in design standards, and computational fluid dynamics (CFD) methods to predict wind-induced pressures. The paper highlights the reasons for obstructing the standardization of the wind tunnel method. Moreover, we introduce improved experimental and CFD techniques to tackle the identified challenges. CFD provides superior and efficient performance by employing wall-modeled large-eddy simulation (WMLES) and hybrid RANS-LES models. In addition, we tested a large-scale building model and compared the results with published small-scale data. The findings reinforce our hypothesis concerning the scaling issues and Reynolds number effects in aerodynamic testing.

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Section: Hybrid Rans-les Techniquesmentioning

confidence: 99%

Assessing aerodynamic loads on low-rise buildings considering Reynolds number and turbulence effects: a review

Khaled

Aly

2022

Adv. Aerodyn.

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“…When studying the modelling of lift and drag coefficients, Rábai and Vad [20] reported that the Spalart-Allmaras model was capable of correctly predicting an isolated aerofoil's pressure distribution, lift and drag coefficients ( Figure 1). Despite its success with isolated aerofoils,Šarić et al [21] concluded that the model did not lend itself to application with the complex geometries that occur with internal flow calculations. In this context, we define an internal flow as a flow through turbomachinery blading, as opposed to the external flow that occurs with isolated aerofoil or aircraft wing flowfield predictions.…”

Section: Rans Models For Incompressible Flows (Without Heat Transfermentioning

confidence: 99%

A Critical Review of Computational Methods and Their Application in Industrial Fan Design

Corsini

Delibra

Sheard³

2013

ISRN Mechanical Engineering

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Members of the aerospace fan community have systematically developed computational methods over the last five decades. The complexity of the developed methods and the difficulty associated with their practical application ensured that, although commercial computational codes date back to the 1980s, they were not fully exploited by industrial fan designers until the beginning of the 2000s. The application of commercial codes proved to be problematic as, unlike aerospace fans, industrial fans include electrical motors and other components from which the flow will invariably separate. Consequently, industrial fan designers found the application of commercial codes challenging. The decade from 2000 to 2010 was focused on developing techniques that would facilitate converged solutions that predicted the fans’ performance characteristics over the stable part of their operating range with reasonable accuracy, using a practical computational effort. In this paper, we focus on elucidating aspects of the flow physics that one cannot easily study in a laboratory environment, discussing the challenges involved and the relative merits of the available modelling techniques. The paper ends with a discussion of the practical problems associated with the use of commercial codes in a development environment and finally the legislation that is driving the need for aerospace style computation methods.

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“…Several other hybrid methods were proposed later, which solved for other two-equation turbulence models instead of the SA model in the RANS region with the characteristic turbulent length scales obtained from the model itself [7]. The hybrid RANS-LES models have been shown capable in simulating in a number of complex flows [8][9][10][11]. However, their application still requires the first grid point satisfy y + < 1 in the wall normal direction, though it relieves the resolution requirement in wall parallel directions.…”

Section: List Of Tablesmentioning

confidence: 99%

“…Table 3-2 Summary of previous work performed using other turbulence models Saric et al [8,36] assessed a number of computational models viz. LES, DES [4,37] , Delayed DES (DDES) [38] and a zonal hybrid LES/RANS [39] (HLR) scheme.…”

Section: Direct Numerical Simulation (Dns)mentioning

confidence: 99%

Wall Modeled Large Eddy Simulation of Flow Over a Wall-Mounted Hump

Dilip

Tafti

2014

Volume 1A, Symposia: Advances in Fluids Engineering Education; Turbomachinery Flow Predictions and Optimization; Applications I

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Comparative Assessment of Hybrid LES/RANS Models in Turbulent Flows Separating from Smooth Surfaces

Cited by 5 publications

References 11 publications

Assessing aerodynamic loads on low-rise buildings considering Reynolds number and turbulence effects: a review

Assessing aerodynamic loads on low-rise buildings considering Reynolds number and turbulence effects: a review

A Critical Review of Computational Methods and Their Application in Industrial Fan Design

Wall Modeled Large Eddy Simulation of Flow Over a Wall-Mounted Hump

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