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A combined volume-of-fluid method and low-Mach-number approach for DNS of evaporating droplets in turbulence

Event Type: 
Date and Time: 
Friday, February 9, 2018 - 16:30
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Dr. Michael S. Dodd

A set of governing equations to describe gas-liquid flows with phase change in the low Mach number limit will be presented. The system of equations accommodates local volume change at the gas-liquid interface due to condensation and evaporation while the total volume of the gas-liquid mixture remains constant. The framework is useful for simulating flows in computational domains that only use combinations of periodic and wall boundary conditions (e.g., isotropic turbulence and turbulent channel flow). Also, compared to the fully compressible formulation, this approach has the advantage of removing acoustic effects from the problem. Using the volume-of-fluid approach, a numerical method to solve the system of equations is developed. The cases of an evaporating and condensing droplet in a closed vessel are solved numerically, and the results show that the algorithm conserves mass while capturing the motion of the interface. The robustness of the method is demonstrated by performing DNS of an evaporating droplet in forced isotropic turbulence.

Bio: 
Dr. Michael Dodd is a Postdoctoral Fellow at the Center for Turbulence Research at Stanford University. Dodd received his Bachelor’s degree in Aerospace Engineering from the University of Michigan in 2009 and his Ph.D. in Aeronautics and Astronautics in 2017 from the University of Washington.