Interaction of Chimney Plumes with an Isolated Obstacle: Experimental and Computational Study

This study investigates the dispersion of pollutants emitted from a chimney in the vicinity of a three-dimensional rectangular building. In the experimental part, a wind tunnel setup was used, where tracer discharges (air seeded with glycerin particles) were continuously released from a point source located within a regular array of building-like obstacles. Measurements of mean velocity and turbulence parameters were obtained. Particle Image Velocimetry (PIV) was employed to capture both instantaneous and mean dynamic characteristics. In the numerical part, the proposed model simulates the flow dynamics and heat transfer using the three-dimensional Reynolds-averaged Navier–Stokes (RANS) equations with an RSM turbulence closure model. The comparison between experimental and numerical results shows a high level of agreement. A comprehensive analysis was conducted to assess the influence of wind velocity on pollutant dispersion from the chimney around the building and its surroundings.

[1] Liu, Y.S.; Cui, G.X.; Wang, Z.S.; Zhang, Z.S. Large eddy simulation of wind field and pollutant dispersion in downtown Macao. Atmos. Environ. 45 (2011) 2849–2859.

[2] Lateb M. ; Masson C. ; Stathopoulos T. ; Bedard C. Effect of stack height and exhaust velocity on pollutant dispersion in the wake of a building, Atmospheric Environment.  45, 29 (2011) 5150-5163

[3] Gousseau, P.; Blocken, B.; Stathopoulos, T.; van Heijst, G.J.F. Near-field pollutant dispersion in an actual urban area: Analysis of the mass transport mechanism by high resolution Large Eddy Simulations. Comput. Fluids 114 (2015) 151–162.

[4] Sivanandan H.; Ratna K. V.;·Goel M.; Asthana A. A study on plume dispersion characteristics of two discrete plume stacks for negative temperature gradient conditions, Environmental Modeling & Assessment 26 (2021) 405–422

[5] Mahjoub Said N.; Mhiri H.; Le Palec G.; and Bournot Ph. Experimental and numerical analysis of pollutant dispersion from a chimney. Atmospheric Environment. 39 (2005) 1727-1738.

[6] Mahjoub Said N.; Habli S.; Mhiri H.; Le Palec G.; Bournot H. Flow field measurement in crossflowing elevated jet. ASME Journal of Fluids Engineering. 129 (2007) 551-562.

[7] Mahjoub Said N.; Mhiri H.; Caminat P.; Le Palec G.; Bournot Ph. Wind tunnel investigation and numerical simulation of the near wake dynamics for rectangular obstacles. Environmental Engineering Science. 25 (2008) 1037-1060.

[8] Contini D.; Cesari D.; Donateo A.; Robins A. G. Effects of Reynolds number on stack plume trajectories simulated with small scale models in a wind tunnel. Journal of Wind Engineering & Industrial Aerodynamics. 97 (2009) 468-474

[9] Saathoff P.; Amit G.; Ted S.; Louis L. Contamination of Fresh Air Intakes Due to Downwash from a Rooftop Structure. Journal of the Air & Waste Management Association. 59 (2009) 343-353.

[10] Castro I. P.; Xie Z. T.; Fuka V.; Robins A. G.; Carpentieri M.; Hayden P.; Hertwig D.; Coceal O. Measurements and Computations of Flow in an Urban Street System. Boundary-Layer Meteorology. 162 (2017) 207–230.

[11] Fuka V.; Xie Z. T.; Castro I. P.;·Hayden P.; Carpentieri M.; Robins A. Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings. Boundary-Layer Meteorology. 167 (2018) 53–76

[12] Amani A.; Amira A.; Rim B. K.; Nejla M. S. Numerical parametric study of turbulent counterflowing jets. International Communications in Heat and Mass Transfer. 155 (2024) 107526.

[13] Demuren A. O.; Rodi W. Three Dimensional Numerical Calculations of Flow and Plume Spreading Past Cooling Towers. ASME J. Heat Transfer. 109 (1987) 113–119.