  Deterministic simulations of the rate equations governing cluster dynamics in
materials are limited by the number of equations to integrate. Stochastic
simulations are limited by the high frequency of certain events. We propose a
coupling method combining deterministic and stochastic approaches. It allows
handling different time scale phenomena for cluster dynamics. This method,
based on a splitting of the dynamics, is generic and we highlight two different
hybrid deterministic/stochastic methods. These coupling schemes are highly
parallelizable and specifically designed to treat large size cluster problems.
The proof of concept is made on a simple model of vacancy clustering under
thermal ageing.
