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In this contribution we present initial results of a study on convectiveboundary mixing (CBM) in massive stellar models using the GENEVA stellarevolution code. Before undertaking costly 3D hydrodynamic simulations, it isimportant to study the general properties of convective boundaries, such asthe: composition jump; pressure gradient; and `stiffness'. Models for a 15Mostar were computed. We found that for convective shells above the core, thelower (in radius or mass) boundaries are `stiffer' according to the bulkRichardson number than the relative upper (Schwarzschild) boundaries. Thus, weexpect reduced CBM at the lower boundaries in comparison to the upper. This hasimplications on flame front propagation and the onset of novae.

Linking 1D Stellar Evolution to 3D Hydrodynamical Simulations