Multiphase Flow

Figure 1
Liquid Evaporation

Our Multiphase Flows group is interested in the modelling and simulation of complex multiphase multicomponent flows. Multiphase flow is important in many industrial processes such like:

  • Oil and Gas extraction
  • Nuclear reactor technology
  • Combustion
  • Aerospace and automotive industries
  • Food production
  • Chemical processes…

Our aim is to understand the physical mechanisms from micro to macro scales and to develop robust numerical methods to integrate the governing equations. In Figure 1, a typical example of liquid-gas two phase flow is presented, where evaporation occurs in a vertical pipe, showing the high complexity of flow regimes.

Our simulation methodology is based on the numerical integration of the Baer-Nunziato equations, which drives the motion of a two-phase flow mixture. The model allows for two pressures/velocities/densities and equilibrium conditions at the interface between two states is ensured through relaxation procedures. This yields to a hyperbolic system solved using our in-house Discontinuous Galerkin Spectral Element Method.

In Figures 2 and 3 are displayed some classic examples of Computational Multiphase Fluids Dynamics, the Rayleigh-Taylor instability (volume fraction )and the interaction of a shock wave with a helium bubble (numerical Schlieren of density mixture).

Figure 2
Rayleigh-Taylor instability from a heavy
fluid flowing in a lighter one

Figure 1
Shock bubble interaction, formation of Richtmyer-Meshkov instabilities