An Evaluation of Inflow Profiles for CFD Modeling of Neutral ABL and Turbulent Airflow over a Hill Model

Document Type : Regular Article

Authors

1 Department of Physics, Faculty of Sciences, Abdelmalek Essaadi University, Tetouan, 93002, Morocco

2 Team: Energy, materials, numerical physics, Higher Normal School, Abdelmalek Essaadi University, Tetouan,93100, Morocco

3 Department of Mathematics, Faculty of Sciences, Cadiz University, Poligono Rio San Pedro S/N Puerto Real, Cadiz, 11510, Spain

4 Department of STIC, National School of Applied Sciences, Abdelmalek Essaadi University, Tetouan, 93002, Morocco

10.47176/jafm.16.08.1702

Abstract

The implementation of the wind turbine is a major issue in the wind engineering sector. However, the presence of wind turbines in the lower part of the atmospheric boundary layer (ABL) requires an appropriate study for the simulation of turbulent airflow in the wind farm situated on hilly terrain. The use of precise Computational Fluid Dynamics (CFD) simulations for the ABL flow is vital for numerous applications, such as wind energy, building, urban planning, etc. To achieve accurate results, it is imperative that the inlet boundary conditions produce vertical profiles that keep a uniform horizontal distribution (with no streamwise gradients) in the upstream region of the computational domain for all important parameters. A development approach is proposed herein, focused on the imposition of two different inlet profiles when used in combination with the rough z0-type scalable wall function. The horizontal homogeneity of these profiles has been verified by 2D Reynolds averaged Navier-Stokes (RANS) through the examination of a neutral ABL in an empty computational domain using the k-ε turbulence model. The findings indicate that the use of this modeling approach can yield relatively consistent homogeneity of neutral ABL for both inlet boundary conditions. Subsequently, sensitivity analyses were performed on the inflow profiles to forecast the evolution of the bottom half of an idealized truly-neutral ABL and to accurately capture the complex dynamics of atmospheric flows over hilly terrain. This study compares the results with the CRIACIV (Inter-University Research Centre on Building Aerodynamics and Wind Engineering) boundary layer wind tunnel experimental data, showing that the inflow profiles and the presence of topographic complex have a significant impact on air velocity, turbulent kinetic energy and turbulence intensity in the x-direction. The results obtained are in good correlation with published experimental data in the presence of the hill surface. 

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Abu-Zidan, Y., Mendis, P., & Gunawardena, T. (2020a). Impact of atmospheric boundary layer inhomogeneity in CFD simulations of tall buildings. Heliyon, 6(7), e04274. https://doi.org/10.1016/j.heliyon.2020.e04274##
Abu-Zidan, Y., Mendis, P., & Gunawardena, T. (2020b). Impact of atmospheric boundary layer inhomogeneity in CFD simulations of tall buildings. Heliyon, 6(7). https://doi.org/10.1016/j.heliyon.2020.e04274##
Augusti, G., Spinelli, P., Bartoli, G., Borri, C., Giachi, M., & Giordano, S. (1995). The C.R.I.A.C.I.V. Atmospheric Boundary Layer Wind Tunnel. Proceedings of the 9th International Conference on Wind Engineering (ICWE).##
Blocken, B., Stathopoulos, T. & Carmeliet, J. (2007a). CFD simulation of the atmospheric boundary layer: wall function problems. Atmospheric Environment, 41(2), 238–252. https://doi.org/10.1016/j.atmosenv.2006.08.019##
Blocken, B., Carmeliet, J. & Stathopoulos, T. (2007b). CFD evaluation of wind speed conditions in passages between parallel buildings-effect of wall-function roughness modifications for the atmospheric boundary layer flow. Journal of Wind Engineering and Industrial Aerodynamics, 95(9–11), 941–962. https://doi.org/10.1016/j.jweia.2007.01.013##
COMSOL. (2016). Guide COMSOL: Introduction to COMSOL Multiphysics.##
Counihan, J. (1969). An improved method of simulating an atmospheric boundary layer in a wind tunnel. Atmospheric Environment, 3(2), 197–214. https://doi.org/10.1016/0004-6981(69)90008-0##
ESDU. (1985). Characteristics of atmospheric turbulence near the ground. Part II: single point data for strong winds (neutral atmosphere). Data Item 85020, Engineering.##
Hargreaves, D. M., & Wright, N. G. (2007). On the use of the k –epsilon model in commercial CFD software to model the neutral atmospheric boundary layer. Journal of Wind Engineering & Industrial Aerodynamics, 95, 355–369. https://doi.org/10.1016/j.jweia.2006.08.002##
Franke, J., Hirsch, C., Jensen, A. G., Krüs, H. W., Schatzmann, M., Westbury, P. S., Miles, S. D., Wisse, J. A., & Wright, N. G. (2004). Recommendations on the Use of CFD in Wind Enginnering. Proceedings of the International Conference on Urban Wind Engineering and Building Aerodynamics, in: Van Beeck JPAJ (Ed.), COST Action C14, Impact of Wind and Storm on City Life Built Environment.##
Juretic, F., & Kozmar, H. (2013). Computational modeling of the neutrally stratified atmospheric boundary layer flow using the standard k – e turbulence model. International Journal of Wind Engineering and Industrial Aerodynamics, 115, 112–120. https://doi.org/10.1016/j.jweia.2013.01.011##
Kozmar, H. (2011). Characteristics of natural wind simulations in the TUM boundary layer wind tunnel. Theoretical and Applied Climatology, 106(1–2), 95–104. https://doi.org/10.1007/s00704-011-0417-9##
Kozmar, H., Allori, D., Bartoli, G., & Borri, C. (2016). Complex terrain effects on wake characteristics of a parked wind turbine. Engineering Structures, 110, 363–374. https://doi.org/10.1016/j.engstruct.2015.11.033##
Kozmar, H., Allori, D., Bartoli, G., & Borri, C. (2018). Wind characteristics in wind farms situated on a hilly terrain. Journal of Wind Engineering & Industrial Aerodynamics, 174(January), 404–410. https://doi.org/10.1016/j.jweia.2018.01.008##
Lubitz, W., & White, B. R. (2007). Wind-tunnel and field investigation of the effect of local wind direction on speed-up over hills. Journal of Wind Engineering & Industrial Aerodynamics, 95, 639–661. https://doi.org/10.1016/j.jweia.2006.09.001##
Narjisse, A., & Abdellatif, K. (2021). Assessment of RANS turbulence closure models for predicting airflow in neutral ABL over hilly terrain. International Review of Applied Sciences and Engineering, 12(3), 238–256. https://doi.org/10.1556/1848.2021.00264##
Norris, S. E., & Richards, P. J. (2010). Appropriate boundary conditions for computational wind engineering models revisited. The Fifth International Symposium on Computational Wind Engineering (CWE2010).##
Parente, A., Gorlé, C., Van Beeck, J., & Benocci, C. (2011). Improved k – epsilon model and wall function formulation for the RANS simulation of ABL flows. Journal of Wind Engineering & Industrial Aerodynamics, 99, 267–278. https://doi.org/10.1016/j.jweia.2010.12.017##
Parente, A., Gorlé, C., Benocci, C., & Dynamics, F. (2010, 23-27 May). RANS Simulation of ABL Flows : Implementation of Advanced Boundary Conditions for Mixed Rough and Smooth Surfaces RANS Simulation of ABL Flows : Implementation of Advanced Boundary Conditions for Mixed Rough and Smooth Surfaces. The Fifth International Symposium on Computaional Wind Engineering (CWE 2010).##
Parente, A., Longo, R., Ferrarotti, M., & Milano, P. (2017). CFD boundary conditions , turbulence models and dispersion study for flows around obstacles. Université Libre de Bruxelles. https://doi.org/10.35294/ls201701.parente##
Pontiggia, M., Derudi, M., Busini, V., & Rota, R. (2009). Hazardous gas dispersion: A CFD model accounting for atmospheric stability classes. Journal of Hazardous Materials, 171(1–3), 739–747. https://doi.org/10.1016/j.jhazmat.2009.06.064##
Richards, P. J., & Hoxey, R. P. (1993). Appropriate boundary conditions for computational wind engineering models using the k-ε turbulence model. Journal of Wind Engineering and Industrial Aerodynamics, 46–47(C), 145–153. https://doi.org/10.1016/0167-6105(93)90124-7##
Singh, N. K., & Badodkar, D. N. (2016). Modeling and analysis of hydraulic dashpot for impact free operation in a shut-off rod drive mechanism. Engineering Science and Technology, an International Journal, 19(3), 1514–1525. https://doi.org/10.1016/j.jestch.2016.05.005##
Sørensen, N. N., Bechmann, A., Johansen, J., Myllerup, L., Botha, P., Vinther, S., & Nielsen, B. S. (2007). Identification of severe wind conditions using a Reynolds Averaged Navier-Stokes solver. Journal of Physics: Conference Series, 75(1). https://doi.org/10.1088/1742-6596/75/1/012053##
Tian, L., Zhao, N., Wang, T., Zhu, W., & Shen, W. (2018). Assessment of in flow boundary conditions for RANS simulations of neutral ABL and wind turbine wake flow. Journal of Wind Engineering & Industrial Aerodynamics, 179 (September 2017), 215–228. https://doi.org/10.1016/j.jweia.2018.06.003##
Tian, L., Zhu, C., Zhu, W., & Zhao, N. (2017). Assessment of inflow boundary conditions for RANS simulations of neutral ABL and wind turbine wake flow. Journal of Wind Engineering and Industrial Aerodynamics, 179(July), 1–26. https://doi.org/10.20944/preprints201707.0085.v1##
Yan, B. W., Li, Q. S., He, Y. C., & Chan, P. W. (2015). RANS simulation of neutral atmospheric boundary layer flows over complex terrain by proper imposition of boundary conditions and modification on the k-e model. Journal of Environnement Fluid Mechanics, 16, 1–23. https://doi.org/10.1007/s10652-015-9408-1##
Yang, Q., Zhou, T., Yan, B., Liu, M., Van Phuc, P., & Shu, Z. (2021). LES study of topographical effects of simplified 3D hills with different slopes on ABL flows considering terrain exposure conditions. Journal of Wind Engineering and Industrial Aerodynamics, 210, 104513. https://doi.org/10.1016/j.jweia.2020.104513##
Yang, W., Quan, Y., Jin, X., Tamura, Y., & Gu, M. (2008). Influences of equilibrium atmosphere boundary layer and turbulence parameter on wind loads of low-rise buildings. 96, 2080–2092. https://doi.org/10.1016/j.jweia.2008.02.014##
Yang, Y., Gu, M., Chen, S., & Jin, X. (2009). New inflow boundary conditions for modelling the neutral equilibrium atmospheric boundary layer in computational wind engineering. Journal of Wind Engineering and Industrial Aerodynamics, 97(2), 88–95. https://doi.org/10.1016/J.JWEIA.2008.12.001##
Yang, Y., Xie, Z., & Gu, M. (2017). Consistent inflow boundary conditions for modelling the neutral equilibrium atmospheric boundary layer for the SST k-ω model. Wind and Structures, 24(5), 465–480. https://doi.org/10.12989/was.2017.24.5.465##
Zheng, K. & Tian, W. (2018, January 1–10). An Experimental Study on the Turbulent Flow Over Two- Dimensional Plateaus. 2018 Wind Energy Symposium. https://doi.org/10.2514/6.2018-0754.##
Volume 16, Issue 8
August 2023
Pages 1515-1530
  • Received: 08 December 2022
  • Revised: 01 April 2023
  • Accepted: 03 April 2023
  • Available online: 31 May 2023