GASP-VI: Fortran Library for Modeling and Simulation of Mixed Continuous and Discrete Processes with Concentrated and Distributed Parameters

Introduction

GASP-VI offered an enhancement to GASP-V. Whereas GASP-V could simulate discontinuous models with concentrated parameters only, i.e., models that can be described by sets of ordinary differential equations (ODEs) with discontinuities, GASP-VI should be able in addition to simulate discontinuous models with distributed parameters, i.e., models that are described by a set of partial differential equations (PDEs) with discontinuities.

GASP-VI transformed PDEs to sets of ODEs by means of the Method of Lines (MOL). The software basically reimplemented algorithms that had previously been implemented in FORSIM-VI, a Fortran library for the simulation of continuous processes with distributed parameters. FORSIM-VI had been developed in the seventies by Mike Carver at the Atomic Energy of Canada.

The software was quite successful in the simulation of parabolic PDEs. It was less well suited for the simulation of hyperbolic PDEs, as such phenomena lead to discontinuities moving through space with time. Therefore, discontinuities exist at all times somewhere in space, which makes it impossible to isolate discrete events in time.

Most Important Publications

Rimvall, C.M. and F.E. Cellier (1982), The GASP-VI Simulation Package for Process-oriented Combined Continuous and Discrete System Simulation, Proc. 10^th IMACS World Congress on Simulation and Scientific Computation, Montreal, Canada, pp.413-416.

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