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@SandreOuza has found that dedaLES will run stably only if the ratio between the grid scale Δ and the Kolmogorov scale, defined as
ℓ = ∜(ν³ / ε) ,
where ν is viscosity and ε is turbulent dissipation, is below a certain number (perhaps around Δ/ℓ = 5). We should document this empirical rule. (Related to #19).
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