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SC²S Colloquium - July 20, 2018

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Date: July 20, 2018
Room: 00.08.038
Time: 12:30 - 13:15

Ravikishore Kommajosyula, M.Sc. (hons): Mechanistic modeling in multiphase CFD applications

Ravi Kommajosyula is a PhD candidate in the "Mechanical Engineering and Computation" program at MIT. He received his M.Sc. (hons) in Computational Science and Engineering (BGCE) from TUM in 2015. This summer he resides in Paris for an internship and he is warmly welcomed by Hans-Joachim Bungartz for a talk.

Multiphase flows are widely encountered in nature and many industrial applications, and are often desirable for process efficiency. Our current understanding of multiphase flows largely comes from empirical observations, and is outside the realm of theory based on first principles. A computational approach to studying multiphase flows (M-CFD) offers a viable alternative to study and design efficient industrial processes in complex 3D geometries.

M-CFD simulations rely on sub-grid scale representation of the underlying physics, provided in the form of “closures” that account for physics that are not captured by the governing equations. Modeling these closures in M-CFD based on local information is often challenging, since most of our understanding comes from empirical observations, which are often integral in nature. Mechanistic models that rely on identifying and modeling the individual mechanisms that contribute to the overall physics, have been successfully applied to multiphase flows, and show great promise in scaling the physical phenomenon for various flow conditions.

In this talk, the idea of mechanistic models is introduced and a part of my doctoral research towards modeling hydrodynamics and boiling heat transfer in multiphase flows is presented. An overview of the approach used to license individual models, and numerical codes for commercial application is given towards the end.

Keywords: Multiphase flows, CFD, Model validation for real applications

Link to his website: Link