The following briefly describes the menus for the Macintosh version of the PERSHELL hard core/soft shell percolation application.
The program may be interrupted at any time by clicking the mouse button.
File:
OPEN: read in file saved as a continuous line of single byte integers representing either porosity (0) or particle (1).
SAVE: saves current image in the same format as described above.
QUIT: exits program.
Execute:
ADD PARTICLES: adds the number, size, and shape of particles as designated by the Shape, Number, Outer diameter, and Inner diameter menus.
BURN FROM TOP: performs the burning algorithm from the top of the image.
BURN FROM LEFT: performs the burning algorithm from the left of the image.
CLEAR IMAGE: erases current image and allows the user to start over without quitting the program.
VOLUME FRACTION: displays the number of particles and the volume (area) fraction, currently present in the image. This command will accurately describe the volume fraction of an image read from disk, but not the number of particles.
Shape: Allows selection of circles only for the shape of the particles to be used in the simulation.
Number: Number of shapes to be placed the next time Add Particles is chosen from the Execute menu.
Outer diameter: Overall diameter of the hard core and soft shell.
Inner diameter: Diameter of the inner hard core. This length must be less than the Outer diameter value.
Seed: The random number generator is originally seeded from the computer’s internal clock. Repeatable exercises are possible by selecting one of the three seeds provided under this menu. Each selection of Seed will reset the random generator to either the clock, or one of the three optional seeds provided.