#benchmark

Projects

soul-test-netflow: three thermal-fluid paradigms on one PWR pin

The same nuclear-reactor pin / coolant-loop physics, built three different ways on one machine — by-hand Python, Julia's ModelingToolkit, and Modelica/Dymola. The comparison across the three is the deliverable.

#python#julia#modelica#modelingtoolkit#dymola

Writing

May 26, 2026DevlogAI-assisted

The same physics on Modelica + Dymola: reaching the full PWR assembly

The third episode of soul-test-netflow — Modelica 4.1 running in Dymola, the mature commercial simulator. The 17×17 PWR fuel assembly that Julia could only extrapolate, completed in 397 seconds end-to-end.

May 26, 2026Essay

Three walls, one paradigm: the bottlenecks are ecosystem gaps, not the math

The capstone of soul-test-netflow — same nuclear-reactor pin physics, three different software stacks. Each one hit a wall at a different scale. The claim worth staking is that the walls are ecosystem-shaped, not paradigm-shaped.

May 21, 2026DevlogAI-assisted

Rebuilding netflow on ModelingToolkit: 14× less code, then a compile wall

The Julia / MTK episode of soul-test-netflow — same physics as the Python netflow, on a high-level symbolic modeling library. Matched node-by-node to 25 mK with 14× less code, and stopped short of a full reactor-assembly model when the compile step became the bottleneck.