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ISSN オンライン: 2642-0554

SUBGRID-SCALE DYNAMIC MODELLING IN LES OF TURBULENT BUBBLY FLOWS

Massimo Milelli
Thermal-Hydraulics Laboratory, Paul Scherrer Institute CH-5232 Villigen PSI, Switzerland

Brian L. Smith
Thermal-Hydraulics Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Djamel Lakehal
Institute of Energy Technology, ETH Zurich ETH-Zentrum/CLT, CH-8092, Zurich, Switzerland

要約

The contribution deals with the large-eddy simulation of a turbulent, vertical mixing layer laden with bubbles at low void-fraction. The subgrid-scale modelling is based on the Smagorinsky kernel, in both its original form and the dynamic procedure of Germano. A new model is proposed for possible bubble-induced turbulence modulation, in which the mixing-length of the dispersed phase at the subgrid-scale is inferred dynamically from the resolved flow field. A two-dimensional idealization of the flow permitted to examine the role of the ratio of the cut-off filter to the bubble diameter, the effect of varying the lift coefficient, and the performance of the subgrid-scale models.