Eulerian modelling of turbulent bubbly flow based on a baseline closure concept

Highlights: • Simulation uncertainty related to inconsistency in closures is discussed. • A baseline closure concept is presented for Euler-Euler simulation. • A strategy for model development and validation is proposed. • A bubble-induced turbulence model is developed based on DNS data. • The goal is to create best-practice guidelines for simulation. - Abstract: A unified set of closures have been applied to simulating different configurations and fluids, i.e. pipe flow and bubble column, air/water and air/liquid metal. The simulated velocity, void fraction and turbulence profiles were compared with the measured ones. Starting from the baseline model for poly-disperse flows the present work is intended to prove the performance of a recently published model for bubble-induced turbulence, which was established on the basis of physical analyses and direct numerical simulation data. The model is shown to work well under various conditions without any need of tuning, and significant improvement in the prediction of turbulence parameters in comparison to other models is demonstrated. This is a great step towards developing the baseline closure concept. Finally, a brief discussion on the further development and future work regarding Eulerian closure models was given.