Multiphase Baer-Nunziato type models for the simulation of self-pressurizing tanks

Self-pressurizing tank dynamics is modeled using a Baer-Nunziato type multiphase model, with relaxation source terms that account for the exchange of momentum, energy and matter among the phases. Numerical results for nitrous oxide are compared to experimental results available in literature. Since the source terms have an infinite relaxation speed, local thermodynamic equilibrium is reached and the model cannot reproduce the initial pressure and temperature drop observed in experimental results. However it well approximates the subsequent linear decrease of pressure with respect to time. Future work will investigate the effects of finite relaxation speed of the source terms.