This catalog points to maintained, task-oriented examples instead of repeating short Java fragments that can drift away from the public API. Start with the canonical quick start, then choose the workflow closest to your engineering question.

Thermodynamics and physical properties

Task	Maintained example	What to verify
Create a fluid and run TP, PH, and dew-point flashes	Thermodynamics recipes	Model, mixing rule, state units, phase result
Understand flash algorithms and validation cases	Flash equations and tests	Convergence, phase stability, material balance
Read density, viscosity, conductivity, and interfacial properties	Property-flash workflows	Required initialization and property units
Select an equation of state	Thermodynamics guide	Fluid range, association, electrolyte limitations

Fluid characterization and PVT

Task	Maintained example	What to verify
Add TBP and plus fractions	Fluid characterization	Molar-mass and density basis, characterization model
Run CCE, CVD, separator, and viscosity studies	PVT simulation workflows	Laboratory conditions, basis, observed-data comparison
Screen crude-oil quality	Oil-quality standards	Method boundary, sample basis, units, expert review

Process simulation and equipment

Task	Maintained example	What to verify
Connect streams, separators, valves, heaters, and compressors	Process recipes	Feed initialization, equipment units, balances
Select execution and inspect process results	ProcessSystem guide	Topology, convergence, calculation identity, reporting
Model tray absorbers and strippers	Absorber and stripper guide	Solver status, tray setup, transfer and balance checks
Explore broader process patterns	Process simulation guide	Model ownership, recycles, operating assumptions

Pipelines and dynamics

Task	Maintained example	What to verify
Choose a steady-state or transient pipeline model	Pipeline documentation index	Geometry, elevation sign, roughness, heat transfer, flow regime
Build a dynamic process case	Process transient simulation guide	Initial steady state, time step, controller topology, inventories

Tutorials and notebooks

The examples index links to complete tutorials and source notebooks. A published notebook should have been executed from a clean runtime and saved with its calculated tables, plots, diagnostics, and validation checks. Interactive outputs need a stored static fallback when they cannot render reliably outside their original environment.

Use the Java getting-started guide for a complete application layout. For short copyable recipes, prefer the maintained cookbook pages over isolated fragments copied from old issues or tests.

Validation checklist

Before adapting an example:

1. Pin the NeqSim version or record the tested master commit.
2. Define composition basis, thermodynamic model, mixing rule, temperature, pressure, and flow units.
3. Run flashes and property initialization in the order required by the API.
4. Check phase availability before reading a named phase.
5. Verify material, component, and energy balances appropriate to the workflow.
6. Compare important results with a nearby operating point and an independent reference or defensible physical bound.
7. Preserve convergence diagnostics and warnings that affect validity.

For common setup, convergence, units, and dependency problems, use the troubleshooting guide.

Engineering boundary

Examples demonstrate reproducible NeqSim calculations. They do not replace fluid-model qualification, equipment design, relief or safety verification, standards interpretation, vendor review, or accountable engineering approval.