I used to support the software that French gas utility GDF used to run simulations on the gas transport network. All of the transport and storage entities (pipelines, compressors, decompressors, underground storage facilities etc) were modelled, and the engineers could run simulations, varying the parameters for different scenarii (cold wave, Algerian crisis, Russian crisis, etc...)

But I'm thirty years out of date with it now.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}