Numerical investigation on phase distribution and turbulence of liquid in bubbly flow using euler-lagrange two-way method

The phase distribution and the effect of bubbles on turbulence of liquid were investigated using the Euler-Lagrange two-way method. The liquid-phase velocity field was solved with the direct numerical simulation (DNS) in the Euler frame of reference, and the bubble motion track was calculated by the Newtonian motion equations considering interaction forces including drag force, shear lift force, inertia force, etc., in the Lagrange fame of reference. The coupling between phases was realized by regarding the interphase forces as momentum source terms of the continuous phase. The result indicates that the drag force, the buoyant force, the shear lift force, and the virtual mass force have greater effect on the motion of bubbles, and the majority of bubbles accumulate near the walls. Compared with the single liquid phase, the addition of bubbles reduces the streamwise mean velocity, turbulent intensity, and the Reynolds stress of the liquid phase. In addition, the injection of bubbles modifies the turbulent frictional coefficient model.