PROGRAM SUMMARY
Title of program:
Balloon
Catalogue identifier:
ADRA
Ref. in CPC:
151(2003)96
Distribution format: zip file
Operating system: Windows ME
Number of lines in distributed program, including test data, etc:
838
Keywords:
Balloon dynamics, Coupled integrodifferential equations, Runge-Kutta,
Atmosphere.
Programming language used: Fortran
Computer:
1.2 GHz, 256 MB PC .
Nature of physical problem:
A version of the balloon equation of motion in an atmosphere that
contemplates features not considered in previous works is presented. A
coupled integrodifferential set results in the most general case.
Numerical solutions become necessary to describe balloon dynamics but in
a few simple cases. This work is intended for previous simulations of
soundings, postflight analysis or general study of open balloon
dynamics.
Method of solution:
Depending on the conditions of the problem to be studied, an integral
term of the balloon equation of motion has to be included or excluded
and respectively a fourth or fifth order Runge-Kutta method has been
implemented to find solutions. Notwithstanding the integrodifferential
nature of the problem, the procedure does not require iterations,
implying a significant run time saving.
Restrictions:
Two-dimensional solutions are found.
Typical running time:
The program takes about 1 second without the history term, but when it
is included there is an increase by orders of magnitude according to the
demanded time step and tolerance for the run.