Fig. 18.

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Turbulent viscosity as a function of 𝒩 for Re = 5 × 104 and Pm = 1. The symbol color shows the Prandtl number Pr as indicated in the legend. The black circle at 𝒩 = 0 is the fiducial dynamo run U0. The error bars show 1 standard deviation intervals around the time averages, which are evaluated over the periods Δt listed in Table 1. The dashed curve shows a power law fit
of the stratified runs at Pr = 10−3. The best fitting parameters are a = 3.1 × 10−4 and δ = 0.50. The right vertical axis displays the turbulent viscosity in units of the molecular viscosity ν.
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