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ISSN オンライン: 2642-0554

DIRECT NUMERICAL SIMULATION OF INTERACTIONS BETWEEN BUBBLES AND WALL-TURBULENCE

Takafumi Kawamura
Ship Performance Division, National Maritime Research Institute 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan

Yoshiaki Kodama
Ship Performance Division, National Maritime Research Institute 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan

要約

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.