ORTHIS: Steady-State Heat Conduction in 2-D X-Y, R-Z and R-Theta Geometry;
ORTHAT: Transient Heat Conduction in 2-D X-Y, R-Z and R-Theta Geometry.
Oak Ridge National Laboratory, Oak Ridge, TN, USA through the NEADB, Issy-les-Moulineaux, France.
Fortran IV (P00569I036000).
ORTHIS and ORTHAT are designed to solve steady-state and transient heat conduction problems, respectively, in two-dimensional geometries. Either Cartesian (x-y) or cylindrical (r-z, r-theta) coordinate systems may be used. Thermal properties, heat generation rates, and boundary conditions may be functions of position, time, or temperature.
ORTHIS uses the iterative method of successive overrelaxation to solve the steady-state problem. In addition to overrelaxation it also uses a dominant-error-mode extrapolation procedure to increase the rate of convergence. ORTHAT uses a modified alternating-direction implicit method to solve the transient problem. The input for both programs has been designed in an easily usable free-form style.
Maxima of –
1000 vertical nodes
1000 horizontal nodes
10000 total nodes (rows*columns)
50 vertical regions
50 horizontal regions
2500 total regions (rows*columns)
1500 steady-state iterations
5000 transient time-steps
Both programs execute in 2 to 3 minutes.
ORTHIS requires 700K, ORTHAT requires 1024K bytes.
A Fortran compiler is required. Source code is written in Fortran IV and modest changes may be required for code compilation on modern platforms.
a. included in documentation
R.C. Durfee and C.W. Nestor, Jr., “ORTHIS, ORTHAT - Two Computer Programs for Solving Two-dimensional Steady-state and Transient Heat Conduction Problems,” ORNL-TM-3324 (July 1971) – includes ACC Programming Note 73-3 (July 31, 1972).
The package is transmitted in a self-extracting executable which contains source, sample problems and documentation.