Application of turbulent diffusivity models to point-source dispersion in outdoor and indoor flows
Application of turbulent diffusivity models to point-source dispersion in outdoor and indoor flows
The modelling and prediction of scalar transport in turbulent flows is crucial for many environmental and industrial flows. We discuss the key findings of our experimental campaigns which focus on two relevant applications: the scalar dispersion of a ground-level point-source in (1) a smooth-wall turbulent boundary layer flow and (2) a supply-ventilated empty room model. For advection-dominated outdoor flows, we show how a Gaussian Plume Model provides a good framework to describe the mean scalar field and discuss its limitations in (wrongly) assuming a constant turbulent diffusivity. For indoor flows, we explore the balance of the advective and turbulent fluxes and their dependence on the room geometry and source position. We use our improved understanding on the scalar transport mechanism in these applications to assess the application of turbulent diffusivity models to predict scalar dispersion, highlighting the importance of carefully defining what the eddy diffusivity coefficient encompasses in different approaches.
turbulence, dispersion, air pollution
Lim, H.D.
3bec23a8-1475-4425-9101-1db28c371d1e
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
28 June 2024
Lim, H.D.
3bec23a8-1475-4425-9101-1db28c371d1e
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Lim, H.D. and Vanderwel, Christina
(2024)
Application of turbulent diffusivity models to point-source dispersion in outdoor and indoor flows.
Thirteenth International Symposium on Turbulence and Shear Flow Phenomena, , Montreal, Canada.
25 - 28 Jun 2024.
6 pp
.
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Conference or Workshop Item
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Abstract
The modelling and prediction of scalar transport in turbulent flows is crucial for many environmental and industrial flows. We discuss the key findings of our experimental campaigns which focus on two relevant applications: the scalar dispersion of a ground-level point-source in (1) a smooth-wall turbulent boundary layer flow and (2) a supply-ventilated empty room model. For advection-dominated outdoor flows, we show how a Gaussian Plume Model provides a good framework to describe the mean scalar field and discuss its limitations in (wrongly) assuming a constant turbulent diffusivity. For indoor flows, we explore the balance of the advective and turbulent fluxes and their dependence on the room geometry and source position. We use our improved understanding on the scalar transport mechanism in these applications to assess the application of turbulent diffusivity models to predict scalar dispersion, highlighting the importance of carefully defining what the eddy diffusivity coefficient encompasses in different approaches.
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Lim-APPLICATION_OF_TURBULENT_DIFFUSIVITY_MODELS_TO_POINT-SOURCE_DISPERSION-155
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Published date: 28 June 2024
Venue - Dates:
Thirteenth International Symposium on Turbulence and Shear Flow Phenomena, , Montreal, Canada, 2024-06-25 - 2024-06-28
Keywords:
turbulence, dispersion, air pollution
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Local EPrints ID: 491898
URI: http://eprints.soton.ac.uk/id/eprint/491898
PURE UUID: 9cd94fb3-6549-4501-b355-4c5a53972209
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Date deposited: 05 Jul 2024 16:50
Last modified: 12 Jul 2024 01:52
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Author:
H.D. Lim
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