Investigating Turbulent Convection in a Rectangular Enclosure Using Shear Stress Transport K-Ω Model
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Date
2020
Authors
Muhoro, John Nyaga
Journal Title
Journal ISSN
Volume Title
Publisher
Kenyatta University
Abstract
Studies have been done on the aspect ratio effect on natural convection turbulence using standard
k-ε model but further studies showed that k-ω SST model performed better than both k-ε and k-ω
model in the whole enclosure. Thus, there was need to do a numerical study on the natural
convection fluid flow in a rectangular enclosure full of air using SST k-ω model. The left vertical
wall of the enclosure was maintained at a steady high temperature Th of 323K while the right wall
at a steady cool temperature Tc of 303K with the remaining walls adiabatic. Time-averaged energy,
momentum and continuity equations with the two equation SST k-omega turbulence model were
used to generate isotherms, streamlines and velocity magnitudes for different aspect ratios of the
enclosure so as to be able to investigate effect of aspect ratio on turbulence. It was shown that as
the aspect ratio of increased from 2, 4, 6 and 8 of the enclosure, the velocity of elements decreased
and the vortices became smaller and more parallel thus concluded that an increase in aspect ratio
decreased the turbulence.
Description
A Project Submitted in Partial Fulfillment of the Requirements for
the Award of Degree of Masters of Science in Applied Mathematics in
the School of Pure and Applied Sciences
Of
Kenyatta University
Keywords
Turbulent Convection, Shear Stress Transport K-Ω Model