Lu, Wright and Brickman recently modified the CANDIE code by
including a free-surface and partial cells. The updating of
free-surface elevations is implicit in time so that the extra
computational cost is minimal in comparison with the original CANDIE
code. The addition of partial cells allows the bottom cell of the
model to have variable thickness, hence improving the ability to
accurately represent topographic variations. They tested the modified
model by solving a two-dimensional, linearized problem of internal
tide generation over topography. They found the numerical model
results agree reasonably well with the semi-analytic solution of Craig
(1987).
The above plot shows a time sequence of internal tide stream-function. Starting from the second panel from the top, each panel lags the one above it by 10.9 hours (the tidal period is 17.45 hours). Positive (negative) values correspond to a clockwise (counter-clockwise) baroclinic circulation. The results are for the sub-critical case (alpha=0.6) using 1 kim horizontal resolution.
For details, please click here to download the ps-file of the
paper.
