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We present multidimensional simulations of the early convective phasepreceding ignition in a Type I X-ray burst using the low Mach numberhydrodynamics code, MAESTRO. A low Mach number approach is necessary in orderto perform long-time integration required to study such phenomena. UsingMAESTRO, we are able to capture the expansion of the atmosphere due tolarge-scale heating while capturing local compressibility effects such as thosedue to reactions and thermal diffusion. We also discuss the preparation ofone-dimensional initial models and the subsequent mapping into ourmultidimensional framework. Our method of initial model generation differs fromthat used in previous multidimensional studies, which evolved a system throughmultiple bursts in one dimension before mapping onto a multidimensional grid.In our multidimensional simulations, we find that the resolution necessary toproperly resolve the burning layer is an order of magnitude greater than thatused in the earlier studies mentioned above. We characterize the convectivepatterns that form and discuss their resulting influence on the state of theconvective region, which is important in modeling the outburst itself.

Multidimensional Modeling of Type I X-ray Bursts. I. Two-Dimensional Convection Prior to the Outburst of a Pure Helium Accretor