Modelling of turbulence modulation in bubbly flows with the aid of DNS data

Budgets of the turbulent kinetic energy from direct numerical simulations of disperse bubbly channel flows are used to develop a new model for bubble-induced turbulence in the Euler-Euler framework. Appropriate scales for the bubble-induced turbulence are determined and the corresponding source terms in the Shear Stress Transport Model are derived from the data. This yields a closure which can be readily used in many existing methods. The model is validated by dedicated Euler-Euler simulations.