Open Access

Numerical Simulation of Spire-Induced Wake Dynamics: Impact of Computational Mesh Resolution on Vertical and Lateral Velocity Field Prediction in CFD Analysis

PDF

Dr. Andi Pratama ¹ , Dr. Siti Rahmawati ¹ ,

⁴ Department of Computer Science Universitas Brawijaya, Malang, Indonesia

⁴ Faculty of Business Administration Universitas Padjadjaran, Bandung, Indonesia

Abstract

The accurate prediction of wake dynamics behind spire-generated atmospheric boundary layers is a critical challenge in computational fluid dynamics (CFD), particularly when resolving vertical and lateral velocity components under varying mesh resolutions. This study investigates the sensitivity of numerical wake characteristics to computational grid refinement in a spire-induced turbulent flow environment. Spires are widely employed in wind tunnel simulations to reproduce realistic atmospheric boundary layer (ABL) conditions, yet their interaction with downstream wake structures remains highly dependent on discretization strategies.

A structured CFD framework is developed to evaluate the influence of mesh density on velocity field accuracy, focusing on wake development, turbulence intensity distribution, and flow anisotropy. The study integrates theoretical ABL modeling principles established in classical wind engineering research (Armitt & Counihan, 1968; Counihan, 1969), while incorporating modern spire-based flow generation methodologies that ensure realistic boundary layer reproduction. Additionally, insights from experimental and numerical investigations on spire-induced flow fields are considered to validate simulation reliability (Fitriady, Rahmat, & Mohammad, n.d.).

The results demonstrate that finer mesh resolutions significantly enhance the fidelity of vertical velocity gradients and lateral wake diffusion, while coarse meshes tend to underestimate turbulence anisotropy and wake recovery length. The findings provide critical implications for CFD-based wind engineering applications, particularly in urban aerodynamics, structural wind loading, and environmental flow modeling. The study also highlights optimal mesh thresholds beyond which computational cost outweighs accuracy gains, offering practical guidance for high-fidelity numerical simulations.

Keywords

CFD simulation, spire-induced wake, mesh refinement

References

J. Armitt and J. Counihan, “The simulation of the atmospheric boundary layer in a wind tunnel,” Atmos. Environ., vol. 2, no. 1, pp. 49–71, Jan. 1968.

J. Counihan, “An improved method of simulating an atmospheric boundary layer in a wind tunnel,” Atmos. Environ., vol. 3, no. 2, pp. 197–214, Mar. 1969.

N. A. Rahmat, A. Hagishima, and N. Ikegaya, “An experimental study on aerodynamic interaction between a boundary layer generated by a smooth and rough wall and a wake behind a spire,” vol. 37, no. 2, pp. 19–26, 2016.

Z. Harun, E. Reda, and S. Abdullah, “Large Eddy Simulation of the Wind Flow Over Skyscrapers,” Recent Adv. Mech. Mech. Eng., vol. 15, pp. 72–79, 2015.

M. A. Fitriady, N. A. Rahmat, and A. F. Mohammad, “QuasiAtmospheric Boundary Layer Generation and Enhancement by Spires in a Boundary Layer Wind Tunnel: a Review.”

N. A. Rahmat, A. Hagishima, N. Ikegaya, and J. Tanimoto, “Experimental study on effect of spires on the lateral nonuniformity of mean flow in a wind tunnel,” Evergreen, vol. 5, no. 1, pp. 1–15, Mar. 2018.

H. Kozmar, “Surface pressure on a cubic building exerted by conical vortices,” J. Fluids Struct., vol. 92, p. 102801, 2020.

H. Kozmar and B. Laschka, “Wind-tunnel modeling of wind loads on structures using truncated vortex generators,” J. Fluids Struct., vol. 87, pp. 334–353, 2019.

J. Nagawkar, S. Ghosh, R. Kataria, A. Nashit, and A. Deora, “Effect of skyscrapers on natural ventilation patterns and human comfort index in low-risebuildings - a CFD analysis over central Mumbai,” ARPN J. Eng. Appl. Sci., vol. 9, no. 3, pp. 293–295, 2014.

E. Pomraning, K. Richards, and P. K. Senecal, “Modeling turbulent combustion using a rans model, detailed chemistry, and adaptive mesh refinement,” SAE Tech. Pap., vol. 1, 2014, doi: 10.4271/2014-01-1116.

Most read articles by the same author(s)

<< < 1 2 3 4 5 6 7 8 > >>

International Research Journal of Advanced Engineering and Technology

Numerical Simulation of Spire-Induced Wake Dynamics: Impact of Computational Mesh Resolution on Vertical and Lateral Velocity Field Prediction in CFD Analysis

Abstract

Keywords

References

Most read articles by the same author(s)

Similar Articles