Multi-fluid models for two-phase and transcritical flows Application to rocket engine configurations with the AVBP solver

National audienceIn various industrial combustion devices, such as liquid rocket engines or Diesel engines, the operating point varies over a wide range of pressure. These pressure variations can lead to a change of thermodynamic regime, switching from two-phase injection to transcritical injection. This change may modify the topology of the flow and the mixing, thereby impacting the flame dynamics. In the present contribution, a framework that is able to simulate compressible flows under both subcritical and supercritical states within the same solver is presented. This is achieved using a multifluid approach coupled with a cubic equation of state (EoS). Liquid/vapor equilibrium is computed within the binodal region to ensure the convexity of the EoS. Examples of coaxial flame simulations are provided, showing good agreements with experimental visualizations