Large Network Examples for the Generation of Modular Simulation Code from Modelica

Abstract

This paper presents progress toward the simulation of large-scale networks in a strict subset of Modelica using Linear Implicit Equilibrium Dynamics (LIED). A specialized compiler generates modular simulation code that scales to millions of equations — beyond conventional monolithic approaches. Demonstrated with a ThermoLiquidStream library for district heating, fractal networks exceeding 10 million equations are successfully simulated on standard hardware. The results confirm that LIED-based modular compilation offers a practical, industrially relevant path for large network modeling while remaining fully compatible with existing Modelica tools.