Numerical Modeling of Pollutant Dispersal from Watercraft Exhaust Systems
The goal of this thesis is to analyze Carbon Monoxide (CO) dispersal in water.
Watercraft exhaust systems issue gaseous products of combustion, of which
Carbon Monoxide is a toxic component, from under the hull of the watercraft
into the water. The aim of the present study is to simulate CO dispersal using
Computational Fluid Dynamics (CFD). Due to the similarity in physical configuration
to the watercraft exhaust system, the canonical problem of a single
Jet In Cross Flow (JICF) is chosen as a validation case. Simulation of the JICF
affords insight into the adequacy of the computational methodology before the
methodology can be extended to simulate the present problem. Watercraft exhaust
systems include dual exhaust ports, and hence, the methodology used
to simulate the single jet is extended to a dual-jet system. Results show a
pronounced interaction of the flow structures developed in the flow field. Further,
the jets in the dual-jet configuration do not penetrate the cross flow to
the extent that the single jet does. This phenomenon will prove important in
the design and control of systems where multiple jets are used for optimum
mixing. The watercraft exhaust system is simulated and the results presented
show that the prevailing large-scale flow structures affect the dispersal of CO.
Based on these results, three ways of mitigating CO dispersal are proposed.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:jet in cross flow multiple jets watercraft exhaust system cfd
Date of Publication:01/01/2008