Session B.pdf - Clarkson University

Software Realization
In the up to date software the realization of programs is the significant part and takes up
to 90% of the program coding and labor intensity in developing software product as a
whole. The software realization includes user interface, the procedures for preparing
initial data, mechanism of interconnection with the in-built data base, graphic support
and so on.
The realization of the calculation algorithm itself in the form of the program code is
significantly more simple: it takes not more than 10% of labor intensity.
To realize the 2D model given above there has been developed the software for MS
Windows. This software includes the unit for digitalizing the scanned topographic maps
on the base of Delone triangulation with further transferring the marks of the site (or
depth) on the calculation grid. Dimensions of the last one are limited only by the volume
of the on-line storage: using PC there have been carried out the calculations on the
grids with more than 2 billion cells (FV) that allows to describe in detail the relief of the
site, bottom, the geometry of the engineering structures. All initial information is stored
in data base (DB) built in the software, the DB was realized on the base of InterBase-
7.0. In the interface of access to the tables of this DB there are facilities to control the
correction of the inputting information, and great information volumes (for example,
bottom maps) are stored in the form of references on their files. Graphic support is realized
in the form of charts for control points (for example, temperatures, dynamics of ice
thickness), color maps of the reservoir (for example, temperature fields with a plan of
the ice cover), three-dimensional visualization of the water surface partially covered
with ice and of the bottom with luminous effect on the base of OpenGL-graphics and so
on. In the process of calculations (for detailed grids they can last about several hours)
the user has got the possibility to follow the parameters of the flow and ice field in digital
and chart form. Besides the information is stored in the files to be viewed and analyzed
after the calculations, in particular, according to the calculations the software
provides recording of “videos” in the format AVI with video-compression (2D and 3D)
projections).
Calculation Examples
Testing of the presented here 2D and 3D hydrodynamics models on the base of analytical
decisions and experimental data is given in the work [13 – 16] and [17,18] correspondingly.
Let’s consider here only the application of these algorithms to two practical
tasks connected with nonsteady heat transmission in open reservoirs and with ice cover
forming on their surface.
The first example – plane simulation of hydro-ice-thermal mode of the reservoir-cooler
situated in middle zone of Russia. For this object there were assigned bathymetry, meteorological
data (daily), the dynamics of the thermal spillway. There were also carried
out temperature measurements of water at water scoop and visual observations for the
plane polynya shapes in the region of water-discharging and in the region of water
scoop. The calculations were carrying out from the middle of September up to the 12-th
of January: for this period the data of the observation on the site were quite full. The
following model parameters were used at obtaining the results shown in Fig. 2. There
was no information about the intensity of snowfall that is why the thickness of the snow
cover was taken equal to a half of the thickness of the ice itself obtained in the process
of calculation at the present moment. The surface heat exchange was calculated with the
use of Braslavsky-Nurgaliev formula: Carpenter formula led to close results.
166