Hedging Direct Simulation Monte Carlo Bets via Event Splitting

We propose a new scheme for simulation of collisions with multiple possible outcomes in variableweight DSMC computations. The scheme is applied to a 0-D ionization rate coefficient computation, and 1-D electrical breakdown simulation. We show that the scheme offers a significant (up to an order of magnitude) improvement in the level of stochastic noise over the usual acceptancerejection algorithm, even when controlling for the slight additional computational costs. The benefits and performance of the scheme are analyzed in detail, and possible extensions are proposed