Investigation of various non-linear eddy viscosity turbulence models for simulating flow and pollutant dispersion on and around a cubical model building

Bazdidi–Tehrani, Farzad; Mohammadi-Ahmar, Akbar; Kiamansouri, Mohsen; Jadidi, Majid

doi:10.1007/s12273-014-0199-y

Cited by 18 publications

(2 citation statements)

References 42 publications

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“…For other turbulence models, because predicted ν t may be different with that from the RNG k-ε model, the Sc t expression function may have different parameters and need further investigation. Bazdidi-Tehrani et al [37] proposed various non-linear eddy viscosity turbulence models and reported the traditional k-ε model using the Boussinesq's isotropic linear eddy-viscosity concept could overproduce turbulence kinetic energy at impingement zone and failed to predict complex flow structures around buildings. However, their study focused on flow and concentration fields on and around an isolated cubical building within the neutral turbulent boundary layer.…”

Section: Discussionmentioning

confidence: 99%

Predicting contaminant dispersion using modified turbulent Schmidt numbers from different vortex structures

Liu

Ren

et al. 2018

Building and Environment

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A B S T R A C TAir pollutant transmission has significant influences on indoor air quality (IAQ). It is crucial to study mechanisms involved with airborne contaminant dispersion indoors. However, relationship between pollutant diffusion coefficient and viscosity in enclosed spaces has not been fully understood. In this study, turbulent Schmidt number (Sc t ) was modified as a function of turbulent kinematic viscosity rather than a constant value to better simulate dispersion of airborne contaminant in two typical enclosed spaces: an aircraft cabin and an office room. An experiment for airborne contaminant transmission was conducted in an aircraft cabin mockup. Combining with experimental data in the office room with an under floor air distribution (UFAD) system from literature, Sc t was modified based on airflow vortex structures. The performance of RNG k-ε model using the modified Sc t was found to be obviously better than that using the default Sc t value in both the two enclosed spaces. In addition, model applicability to different enclosed spaces was analyzed based on the airflow vibration frequency.

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Section: Discussionmentioning

confidence: 99%

Predicting contaminant dispersion using modified turbulent Schmidt numbers from different vortex structures

Liu

Ren

et al. 2018

Building and Environment

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“…For this purpose, the spectrum is calculated and compared using time-history data of the lift coefficient signals of the setback building. This is made to find the timescale of the energy-containing turbulent eddies in building aerodynamics by Bazdidi-Tehrani et al (2015). The Power Spectral Density (PSD) graphic identifies the frequency with the highest energy unsteady signal.…”

Section: Comparison Of Across Wind Power Spectrum Density With Variou...mentioning

confidence: 99%

Evaluation of CFD URANS Turbulence Models for the Building under Environmental Wind Flow with Experimental Validation

2022

JAFM

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Wind flow on and around buildings attains more importance among architectures, builders, urban planners, structural engineers, and wind engineers. Wind tunnel experiments and wind flow assessments of full-scale buildings are expensive and complex in varied terrain conditions. Hence, wind flows are extensively assessed using Computational Fluid Dynamics (CFD). By following the turbulence parameters, CFD turbulence models create the wind tunnel and atmospheric environments. No literature has till elucidated which CFD turbulence model is more suitable for predicting the terrain wind flow on and around high-rise buildings. The efficiency of the CFD models, their performance, and their accuracy must be validated with experimental results, which is indispensable before using the turbulence model in practice. Therefore, this investigation aims to validate the Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations for a setback tall building under open terrain wind conditions enclosed within the wind tunnel dimensions. The URANS simulation is accompanied with Standard k-ε, Realizable k-ε, RNG k-ε, Standard k-ω, k-ω SST and RSM. The k -ω SST and RSM turbulence models have reproduced the wind pressure coefficients observed from the wind tunnel. However, all turbulence models failed to produce the same velocity profiles at downstream recirculation, as they vary with sampling time. The transient feature, RMS (Root Mean Square), is better reproduced by RSM and k-ω SST models, while the most unsteady features like across wind spectra and eddies were captured by Realizable, RSM and SST using iso-surface. k-ω SST and RSM models predict similar results with the experiment. Where less computational time was required for the SST, it is promising that this model provides both mean pressure and unsteady feature, encouraging more accurate simulation around the buildings.

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Embedded large eddy simulation approach for pollutant dispersion around a model building in atmospheric boundary layer

2016

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Investigation of various non-linear eddy viscosity turbulence models for simulating flow and pollutant dispersion on and around a cubical model building

Cited by 18 publications

References 42 publications

Predicting contaminant dispersion using modified turbulent Schmidt numbers from different vortex structures

Predicting contaminant dispersion using modified turbulent Schmidt numbers from different vortex structures

Evaluation of CFD URANS Turbulence Models for the Building under Environmental Wind Flow with Experimental Validation

Embedded large eddy simulation approach for pollutant dispersion around a model building in atmospheric boundary layer

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