This dataset contains the results of 5 transient CFD simulations of the Adelaide Jet in Hot Coflow (JHC) burner, an established benchmark for turbulent diluted combustion under MILD-like conditions. The simulations were performed with ANSYS Fluent 24R1 on a 2D axisymmetric mesh of approximately 35 000 quadrilateral cells. Additional information can be found in the provided `README.ipynb`.

The burner consists of a water-cooled central jet (∅ 4.25 mm) issuing an equimolar H₂/CH₄ mixture into an annular coflow (∅ 82 mm) of hot combustion products. Two input parameters are dynamically varied: the jet Reynolds number Re ∈ [5 000, 10 000] and the coflow O₂ mass fraction Y_O2 ∈ [0.03, 0.09]. Five excitation profiles are provided, logarithmic chirp signals (training) and step inputs (test), designed to support data-driven reduced-order modelling of turbulent reacting flows.

The CFD model was built using ANSYS Fluent 24R1 with:

- Standard k-ε turbulence model (C_ε1 = 1.6)

- Partially Stirred Reactor (PaSR) combustion model with integral-based mixing timescale (C_mix = 0.1)

- Kee kinetic mechanism for H₂/CH₄ oxidation

- Discrete Ordinates (DO) radiation model with WSGGM spectral properties

- Time step: Δt = 1×10⁻⁵ s, fields sampled every 200 steps (sampling interval 2 ms)

The outputs provided in each `.npz` file include:

- Thermochemical scalar fields: CH4, CO, CO2, H, H2, H2O, N2, O, O2, OH (mole fractions) and temperature T [K]

- 2D mesh node coordinates

The coflow O₂ boundary condition Y_O2 is specified as a mass fraction.

Please cite the dataset when using this material.