Comparison of the buoyancy term as a function of radius. The results obtained from the 1- and 3-equation model are shown with a blue and orange line, respectively. The associated RANS correlations extracted from the sim_k and sim_m simulation are shown in the upper panel and lower panel, respectively. We indicate the entropy and TKE boundaries with dashed and dotted lines in the respective colour. The insets show the region of negative convective flux.