Sketch2Simulation: Automating Flowsheet Generation via Multi Agent Large Language Models

Researchers developed an end-to-end multi-agent AI system that automatically converts hand-drawn process engineering diagrams into executable simulation models for Aspen HYSYS software. The framework achieved high accuracy with connection consistency above 0.93 and stream consistency above 0.96 across four chemical engineering case studies of varying complexity.

• →Multi-agent LLM system successfully automates the conversion of process sketches into executable HYSYS simulation models.
• →Framework uses three coordinated layers: diagram parsing, simulation model synthesis, and multi-level validation.
• →System achieved complete structural fidelity on simpler cases and strong performance on complex industrial processes.
• →Technology addresses a major bottleneck in process systems engineering that previously required substantial manual effort.
• →Results demonstrate viable sketch-to-simulation workflow while highlighting challenges with dense recycle structures.