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Transient CFD Dataset - Adelaide Jet in Hot Coflow (AJHC) 

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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`.
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The burner consists of a water-cooled central jet (∅ 4.25 mm) issuing an equimolar H\u2082/CH\u2084 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 O\u2082 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.
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The CFD model was built using ANSYS Fluent 24R1 with:
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- Standard k-ε turbulence model (C_ε1 = 1.6)
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- Partially Stirred Reactor (PaSR) combustion model with integral-based mixing timescale (C_mix = 0.1)
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- Kee kinetic mechanism for H\u2082/CH\u2084 oxidation
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- Discrete Ordinates (DO) radiation model with WSGGM spectral properties
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- Time step: Δt = 1×10\u207b\u2075 s, fields sampled every 200 steps (sampling interval 2 ms)
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The outputs provided in each `.npz` file include:
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- Thermochemical scalar fields: CH4, CO, CO2, H, H2, H2O, N2, O, O2, OH (mole fractions) and temperature T [K]
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- 2D mesh node coordinates
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The coflow O\u2082 boundary condition Y_O2 is specified as a mass fraction.
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Please cite the dataset when using this material.
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