Space and time distribution of subsurface H2 concentration in so-called “fairy circles”: Insight from a conceptual 2-D transport model

Open Access

Table A1

Parameter values used in the model.

L	Layer thickness	30 m
K	Permeability	10 Da (1 Da = 10⁻¹² m²)
	Hydrogen viscosity	0.88e-5 Pa*s
	Porosity	0.3
P₀	Pressure	10⁵ Pa
	Hydrogen density	0.0832 kg/m³
D_atm	Molecular diff. coeff.	7e-5 m²/s
ΔP_fracture	Surplus in gas pressure at fracture	2 bar, 5 bar, 10 bar

Note: The numerical problem has been solved with parallel direct sparse solver (PARDISO), with relative and absolute tolerance of 0.01 and 0.001 respectively in all the simulation cases presented in this paper. The reference case has dimensions of 30*200 m with homogeneous permeability field. The size of simulation domains involved in the calculation is composed of 3794 nodes, which conducts correct convergence of the simulations.

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