Fig. 19.
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Initial entropy profile and profiles after 17.5 and 25 convective turnover times for the 3D simulation with a grid of 180 × 902 cells, the AUSM+-up solver, and an energy boosting of b = 3 × 104. Vertical dotted lines mark the region that is considered to calculate the mean entropy gradient in the radiation zone ΔsRZ/Δr from the initial entropy profile.
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