RESUMO

A new computational method for investigating interactions between bubbles and turbulence has been developed. Both liquid and gas phases are treated as incompressible continuum fluids and solved by a finite volume method, while the interface between the phases is resolved by a front-tracking method. The accuracy of the method is validated for the problem of a single rising bubble. The method has been applied to a direct numerical simulation (DNS) of a fully developed turbulent channel flow containing bubbles. The results of DNS computations suggest that large bubbles can be preferable for the frictional drag reduction at low Reynolds numbers.