What Does the Fuel Layer Look Like Right Before the Flash?

• A major part of the challenge in doing these simulations is knowing how to initialize the grid.

  • What sort of temperature perturbation (size, shape, duration) is required to get the event underway?

• Evolution right up to the point of ignition by a multi-d code is currently not available.

  • Good initial conditions, right before the runaway are hard to get.

• Most models suppose that the ignition begins at a single point, and propagates across the star.