Three-dimensional thermo-mechanical simulations of heterogeneous solid propellants

摘要

In this work, we present a numerical framework that describes thermo-mechanical deformations in aburning heterogeneous solid propellant. These deformations are quasi-static at time scales associatedwith combustion, and the resulting thermo-mechanical formulation is discretized on a Cartesian gridusing a hypoelastic law. We use a weak form of Chorin-type projection method to deal with large differencein shear modulus of the constituent materials. Extending our previous two-dimensional work, gridconvergence studies for a three-dimensional propellant configuration are presented for the stress, velocity,and reference map components. Finally, simulations are carried out for a random propellant pack thatis coupled to a gas phase, and we present results for the pack undergoing combustion, with and withoutdeformations.