Development of a Modular Software System for the Dynamic Simulation of Coal Conversion Plants. Quarterly Report,April--June 1977.

摘要

The transportability of a prototype DSS/2system was demonstrated by installation on the IBM 360/195at Oak Ridge National Laboratory and the UNIVAC 1108at ERDA-Aberdeen. The prototype DSS/2system was also sent to six other computer centers,and there has been no indication of installation problems. Detailed implicit integration algorithm testing has concluded,at least temporarily,with GEARB:Diagonal Approximation to the System Jacobian Option the preferred implicit algorithm. The GEARB/Dynamic Methanator Model combination has been tuned for efficient integration and considerable experience gained. Stiffness and numerical instability are separate phenomena,at least in the case of the methanator. GEARB successfully integrates the stiff methanator model. Some artificial excursion limiting is necessary to suppress unstable tendencies during the first few time steps. Complete transients in temperature and composition can be obtained for the methanator starting with constant initial profiles. Other changes,such as starting with a steady-state profile and reducing the flow rate can be integrated. The steady-state profiles obtained by letting the dynamic solution run agree with the independently determined steady-state profiles. (ERA citation 03:013638)