Two intricate issues reiated to environmental hydrodynamics and water quality numerical
modeling, with specific application to lakes, are addressed in this report: turbulent closure for
stratified flows and transformation of the physical domain into a computational domain. Both
problems are very important for the development of an accurate and efficient numerical
algorithm intended to simulate thermo-hydrodynamics and transport processes in a lake (pond)
cross section. The first section of the report considers the state-of-the art in turbulence modeling
of environmental/geophysical flows (e.g. lakes, oceans, atmosphere) particularly in stratified
ambiences, where the vertical turbulent transport is significantly hIndered by density
stratification. The findings and recommendations stemming from this investigation are reported
herein. In the second section of the report, the numerical treatment of irregular lake geometry is
described in detail and a simple, efficient mapping transformation is proposed to facilitate the
computation in a lake cross section of an arbitrary form.
Metro Region Fisheries, Minnesota Department of Natural Resources
Stefanovic, Dragoslav L.; Stefan, Heinz G..
Certain Computational Aspects of Modeling Stratified Environmental/Geophysical Flows Pertaining to Lakes.
St. Anthony Falls Laboratory.
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