R-THYM Update: High-Performance MOC Transients and Interactive EPANET Water Quality Modeling [version 1.300]

Jason Lillywhite · Aug 14, 2026

This latest update to R-THYM v1.300 introduces key enhancements to our numerical simulation engine, water quality modeling suite, and canvas usability. 1. High-Performance MOC Solver We have optimized the Method of Characteristics (MOC) numerical solver responsible for transient pressure surge and water hammer simulations. Faster Calculation Times: Transient calculations for long pipelines with high node counts, valve closures, or pump trips now compute significantly faster. Smoother WebAssembly Rendering: Improved memory management and execution pipelines reduce client-side CPU overhead, resulting in smoother real-time canvas animations during heavy surge events. 2. Integrated EPANET Water Quality Modeling EPANET water quality modeling capabilities are now fully incorporated into the simulation suite. This enables multi-source blending and chemical concentration management. Constituent Blending & Control: You can model mixing configurations, such as managing a chlorinated source and a fresh water source simultaneously, with interactive controls to maintain targeted concentration constraints at your delivery points. Extended Period Simulation (EPS) Reports: The EPS summary report now displays real-time peak (maximum) and valley (minimum) constituent concentrations at all active outflow nodes. Multiple WQ Modes: Support has been added for Chemical constituent propagation, Water Age calculation, and Source Tracing. 3. Usability and Viewport Updates Globally Hidden Pipe ID Labels: To declutter dense models on the canvas, pipe ID labels are now hidden by default. The ID and all properties remain instantly visible by clicking on the pipe. Fullscreen Standalone Support: Added apple/android mobile-web-app capabilities. Saving R-THYM to your home screen launches the app in standalone fullscreen mode. A dedicated "Fullscreen Mode" has also been added to the File menu for both desktop and mobile viewports.