PhD project: Study of droplet-turbulence interaction in two-phase flows by means of DNS

 PhD student: Ir. Marcel Kwakkel

 Project description
Turbulent dispersed gas/liquid flows occur in many industrial and environmental processes, like spray injection in engines, the formation and removal of droplets in the production of natural gas, and droplet formation in clouds. At the same time, due to their complexity, the droplet-turbulence interaction is not well understood. The focus of this project is especially on understanding droplet dynamics and turbulence modification in the clustering regime at a Stokes number of order 1. We will consider droplets whose characteristic size is significantly larger than the Kolmogorov length scale, whence they cannot be modeled as point droplets. We intend to perform Direct Numerical Simulations (DNS) of a large number O(103) of inertial droplets in a turbulent carrier fluid. In such flows a good representation of break-up and coalescence is necessary.

Project start: June 2008

Publications
1. M. Kwakkel, W.-P. Breugem and B.J. Boersma. DNS of turbulent bubbly downflow with a Coupled Level-Set/Volume-of-Fluid method. In: Proceedings of the ERCOFTAC workshop Direct and Large-Eddy Simulation 9 (DLES9), Dresden (Germany), 3-5 April 2013. (to appear in 2014)
2. M. Kwakkel, W.-P. Breugem and B.J. Boersma. Extension of a CLSVOF method for droplet-laden flows with a coalescence/breakup model. J. Comput. Phys., 253:166-188, 2013. [link]
3. M. Kwakkel, W.-P. Breugem and B.J. Boersma. An efficient multiple marker front-capturing method for two-phase flows. Computers and Fluids, 63:47-56, 2012. [link]