Annular Flume
MOHID system
is currently being applied to an
annular flume, using experimental
laboratorial data to
validate the results. The first step is to validate the water flow;
then
the cohesive sediment transport processes, namely
erosion and deposition; then
the transport of particulate and dissolved
contaminants
in the water column and in the sediment;
and later the influence of macrofaunal
bioturbation and biodeposition on both cohesive sediment and
contaminant transport and fate.
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Annular flume horizontal
discretization |
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In
order to simulate the hydrodynamics the annular flume the
centrifugal acceleration was added
in the inertial forces term when computing the
hydrodynamic solution. A new type of horizontal
discretization was also
constructed as well some adaptations to this new grid were performed.
Hydrodynamics is forced by
applying a shear stress at the surface of the
water column, increasing linearly with the flume radius. This approach
pretends to simulate the actual mechanism that forces water to flow in
the annular flume operated in the lab. Shear values were applied so that
maximum water velocity obtained, in the upper layer was about 50 cm/s.
A non-slipping condition is considered to both the bottom and
lateral boundaries, having the latter the most important contribution to
the shear forces. Cycle
boundary conditions are considered to assure continuous flow, as
well as in the mass tranport model.
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