Abstract: Exemplary practice of the present invention defines “sphibules” in computer-modeling the spread of a substance in a fluid medium. A “sphibule,” a modeling entity conceived and named by the present inventors, represents a discrete quantity of a substance that is propagative in a fluid medium. Every sphibule has the same size when created, the same constant geometric shape, the same constant mass, and a uniform density. Multiple sphibules are created at a prescribed rate at a source in the fluid medium. Several or many timesteps are performed to compute enlargement and relocation, in the fluid medium, of each sphibule that has been created. Through succeeding timesteps, each sphibule becomes less dense and more distant from the source. A sphibule ceases to exist when the sphibule is less dense than a prescribed minimum density of the sphibules, and/or when the sphibule travels beyond a prescribed spatial boundary of the fluid medium.

Abstract: Exemplary inventive practice provides initially for designation of all tasks contemplated for performance in the context of an interoperability architecture for computer modeling/simulation. Task requirements afford the bases for determining the models to be incorporated and the functionalities to be carried out in the architecture. The major architectural elements are the core, the interface, and the modules. The core is compartmentalized. Each module constitutes an individual model. Each functionality is allocated to either the core or at least one module, with the guiding principle that a functionality that characterizes the modules in general should be situated in the core, in at least one category. The interface provides for plug-and-play functionality of the modules. The architecture operates in an iterative three-phase cycle: modules write data to the core; the core processes data; modules read updated core data.