...,

We generally set alpha =0.1 in our simulations thus allowing a maximum fractional variation of 10% of all the variables we are more interested in (i.e, temperature, density and pressure).

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...(8)

However, the geometric ratio q is always chosen in the interval 1 < q < 1.2, to guarantee a fractional variation of the cell size below 20% (Thompson et al. 1985; Fletcher 1988).

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