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Multiphase flows: Rich physics, challenging theory, and big simulations

Shankar Subramaniam*

  • Center for Multiphase Flow Research and Education (CoMFRE), Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA

  • *shankar@iastate.edu
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Phys. Rev. Fluids 5, 110520 – Published 24 November, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.110520

Abstract

Understanding multiphase flows is vital to addressing some of our most pressing human needs: clean air, clean water, and the sustainable production of food and energy. This article focuses on a subset of multiphase flows called particle-laden suspensions involving nondeforming particles in a carrier fluid. The hydrodynamic interactions in these flows result in rich multiscale physics, such as clustering and pseudo-turbulence, with important practical implications. Theoretical formulations to represent, explain, and predict these phenomena encounter peculiar challenges that multiphase flows pose for classical statistical mechanics. A critical analysis of existing approaches leads to the identification of key desirable characteristics that a formulation must possess in order to be successful at representing these physical phenomena. The need to build accurate closure models for unclosed terms that arise in statistical theories has motivated the development of particle-resolved direct numerical simulations (PR-DNS) for model-free simulation at the microscale. A critical perspective on outstanding questions and potential limitations of PR-DNS for model development is provided. Selected highlights of recent progress using PR-DNS to discover new multiphase flow physics and develop models are reviewed. Alternative theoretical formulations and extensions to current formulations are outlined as promising future research directions. The article concludes with a summary perspective on the importance of integrating theoretical, modeling, computational, and experimental efforts at different scales.

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2020 Invited Papers

Physical Review Fluids publishes a collection of papers associated with the invited talks presented at the 72nd Annual Meeting of the APS Division of Fluid Dynamics.

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Outline

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Phys. Rev. Fluids 5, 110520– Published 24 November, 2020
  • Received 21 July 2020
  • Accepted 11 November 2020
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