SIMULATION: Transactions of The Society for Modeling and Simulation International

Coleman, Thomas G.

doi: 10.1177/003754977201900404pmid: N/A

Ung, Man T.; Moellmer, William O.

doi: 10.1177/003754977201900402pmid: N/A

Pitts, Gerald N.; Crawford, Paul B.

doi: 10.1177/003754977201900403pmid: N/A

Many engineering problems require the numerical solution of several hundred to a few thousand simultaneous equations of the Laplace, Poisson, or Fourier types. These equations occur in the solution of many sci entific problems on heat flow, fluid flow, diffusion, and structural problems, etc. There are many methods available for solving these problems; however, there has been little said about core allocations, execu tion times, and programming difficulty of each method. This paper compares five of the best known methods in terms of core allocation, execution times, and program ming difficulty.

Clark, R. Lawrence; Groner, Gabriel F.

doi: 10.1177/003754977201900405pmid: N/A

CHEMCSMP is a convenient problem-oriented language based on CSMP/360 and is designed specifically to solve problems in kinetic chemical equations. Users' statements, which resemble conventional chemical nota tion, describe slow and fast reactions in multicompartment systems and flows between compartments. CSMP statements may be inter mixed with chemical equations to provide for a variety of computations and convenient output. CHEMCSMP is implemented via a pre compiler which translates the user's pro gram into pure CSMP. The paper describes the use and implementation of CHEMCSMP and provides an illustrative example.

Rigas, H.B.; Coombs, D.J.

doi: 10.1177/003754977201900406pmid: N/A

One factor of importance in a complete auto matic analog-computer patching system is a software package to provide the actual patching information for a model described in a high-level language.Several approaches to this problem have been proposed. One such program, PATCH, differs from the others in that it not only uses a continuous simulation language as a means of describing the model to be patched, but also actually uses the simulation processor as an integral part of the patching program.The simulator which was used for the imple mentation of the patching program is S/360 CSMP. Since PATCH was first described in the literature, many have inquired about the possibility of using another simulator such as CSSL or MIMIC in the same way.We will attempt here to outline the modifi cations made to CSMP and their purpose so that one intimately familiar with another simulator could make similar alterations to that program.PATCH itself is a subroutine written in FORTRAN IV and could readily be modified to accept input from other simulators.

Blum, Major Joseph J.

doi: 10.1177/003754977201900407pmid: N/A