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OpenFLUMEThermo-fluid network analysis in your browser

A finite-volume network solver in the GFSSP / SINDA-FLUINT class. No install, no account, and your model never leaves your machine. Open source and checked against published benchmarks.

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See the verification record

Zero install, local-first

The solver runs in a Web Worker in your browser, with real-fluid properties from CoolProp compiled to WebAssembly. Nothing is uploaded, so it works on locked-down machines and with sensitive models.

Built for propulsion and thermal work

Tanks, feed lines, orifices, valves, regulators, cavitating venturis, pumps, heated pipes, regenerative cooling, cryogenic chilldown, radiator loops, and CEA-coupled combustion junctions.

Steady and transient

A Newton–Raphson steady solver and a backward-Euler transient solver with adaptive time steps. Fluid inertia, trapped-gas cushions, schedules, PID control, and stop conditions.

Real fluids, two-phase, compressible

A 124-fluid CoolProp HEOS catalogue and a homogeneous-equilibrium two-phase model. Opt-in quasi-1-D compressible flow with Fanno/Rayleigh choking and converging–diverging nozzles.

Generated verification reports

Seven validation reports are generated from live solves, each labeled analytic, code-to-code, or experimental. CI reruns the full scientific suite weekly.

Scriptable from Python

pip install openflume drives the same solver core from Python, with sweeps, NumPy/pandas output, and a CLI. Save a model from the app and solve it in a notebook.

MIT licensed and auditable

Every equation, closure, and tolerance is documented in the user manual, and the source is on GitHub. Cite it with the Zenodo DOI.

Tank blowdown results in OpenFLUME: pressure and temperature histories of a venting tank

Try a model now ​

Each link opens a working model in the app:

ModelWhat it shows
Sanity: orifice hand-calcA steady result you can check by hand
Tank blowdownTransient ideal-gas tank venting through a choked orifice
Cryogenic line cooldownTwo-phase chilldown of a cryogenic transfer line with conjugate heat transfer
LOX/RP-1 thruster (transient startup)Feed system, CEA-coupled combustion chamber, and regen-cooled nozzle
Spacecraft radiator panelAmmonia loop with a radiating panel
Capillary circuitMicrofluidic stop and trigger valves

All 14 built-in models are in the examples gallery.

Where it stands ​

OpenFLUME is alpha software (v0.3.1): a lumped-parameter network code (not CFD) with no shock capture, no method-of-characteristics water hammer, and HEM-only two-phase flow. The scope boundaries list every limitation. If it disagrees with a reference you trust, open an issue with the details; well-documented disagreements are the most useful contributions.

New here? Start with the 5-minute guide. Coming from GFSSP or SINDA/FLUINT? Read the migration notes. Teaching a course? See the educator kit.