Radiant transfer due to lighting: An example of symbolic model generation for the simulation problem analysis kernel.

摘要

The Simulation Problem Analysis Kernel (SPANK) is a simulation environment under development at Lawrence Berkeley Laboratory. A principal departure from other simulation environments is that system models are constructed from submodel objects that are defined without prescribed input or output interfaces, yielding greater modeling flexibility. Also, graph theoretic techniques are employed to determine the solution sequence, including reduction of the iterative problem size. In this paper we show one role of symbolic manipulation in SPANK processing, namely automatic generation of submodels using the MACSYMA(trademark) package. This is demonstrated in the context of steady state radiant and convective heat transfer in a room with a fluorescent lighting system, and then in the corresponding dynamic context. Submodel definition and generation are described, followed by the solution of several interesting problems defined with the submodels. 11 refs.