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- W793608211 abstract "Turbulent buoyant jets are a major feature in fire hazards. The solution of theReynolds Averaged Navier-Stokes (RANS) equations through computational fluiddynamic (CFD) techniques allow such flows to be simulated. The use of Reynoldsaveraging requires an empirical model to close the set of equations, this is known asthe turbulence model. This thesis undertakes to investigate linear and nonlinearapproaches to turbulence modelling and to apply the knowledge gained to thesimulation of compartment fires. The principle contribution of this work is the reanalysisof the standard k- e turbulence model and the implementation andapplication of more sophisticated models as applied to thermal plumes.Validation in this work, of the standard k- e model against the most recentexperimental data, counters the established view that the model is inadequate for thesimulation of buoyant flows. Examination of previous experimental data suggeststhat the measurements were not taken in the self-similar region resulting inmisleading comparisons with published numerical solutions. This is a significantconclusion that impacts of the general approach taken to modelling turbulence inthis field.A number of methods for modelling the Reynolds stresses and the turbulent scalarfluxes have been considered and, in some cases for the first time, are applied to nonisothermalflows. The relative influence of each model has been assessed enablingits performance to be gauged. The results from this have made a valuablecontribution to the knowledge in the field and have enabled the acquired experienceto be applied to the simulation of compartment fires.The overall conclusion drawn from this thesis is that for the simulation ofcompartment fires, the most appropriate approach with current computationalresources, is still the buoyancy corrected standard k- e model. However, theturbulence scalar flux should be modelled by the generalised gradient diffusionhypothesis (GGDH) rather than the eddy-diffusivity assumption." @default.
- W793608211 created "2016-06-24" @default.
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- W793608211 date "2001-02-01" @default.
- W793608211 modified "2023-09-28" @default.
- W793608211 title "Turbulence modelling of turbulent buoyant jets and compartment fires" @default.
- W793608211 hasPublicationYear "2001" @default.
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