Combustion Lab

3D low-Mach reacting flow · propane burner · SI units · WebGPU

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Case

Burner side D m Heat release Q kW Grid n × n × 2n Step ms Pressure V-cycles Exposure

Performance

Cells	–
Frame	– ms · – fps
Steps	– /s · step – ms · clock –× real time
Throughput	– Mcell·steps/s
Stability	Courant (\|u\| + \|v\| + \|w\| + dx \|div u\|) dt / dx –, limit 0.5 · von Neumann 6 ν dt / dx² –
Continuity	residual – /s · expansion – /s, on the axis · peak speed – m/s
Simulated	0.0 s

Validation

Puffing frequency	model – Hz · Cetegen 1.5/√D = – Hz
Heat released	model – kW of the – kW fed: the fuel burns where it meets air, or leaves unburned
Flame height (99% of the heat release below)	model – m · Heskestad = – m
Peak centreline T	model – °C
ΔT at z/Q^(2/5) = 0.05	model – K · McCaffrey – K
ΔT at z/Q^(2/5) = 0.15	model – K · McCaffrey – K
ΔT at z/Q^(2/5) = 0.30	model – K · McCaffrey – K

Flow regime, on the axis

Grashof g ΔT D³ / (T ν²)	– · a buoyant plume is turbulent above ~10⁹ (Gebhart et al.)
w at z = D	– m/s · turbulence intensity w′/w̄ – %
w at z = – m	– m/s · intensity – % · (half the flame height)
Reynolds w̄ D / ν	molecular – · effective (with the subgrid viscosity) – · ν – m²/s
Cell Reynolds w̄ dx / ν_eff	– · below ~2 the grid damps every eddy it carries

Averages over the last 8 s of simulated time, after the starting transient (t > 2 s): no samples yet. View: left drag orbits, right drag pans, wheel or middle drag zooms.

GPU messages

compile: clean

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