Recasting Navier-Stokes equations

M. H. Lakshminarayana Reddy, Kokou Dadzie, Raffaella Ocone, Matthew K. Borg , Jason M. Reese

Research output: Contribution to journalArticle

Abstract

Classical Navier-Stokes equations fail to describe some flows in both the compressible and incompressible configurations. In this article, we propose a new methodology based on transforming the fluid mass velocity vector field to obtain a new class of continuum models. We uncover a class of continuum models which we call the re-casted Navier-Stokes. They naturally exhibit the physics of previously proposed models by different authors to substitute the original Navier-Stokes equations. The new models unlike the conventional Navier-Stokes appear as more complete forms of mass diffusion type continuum flow equations. They also form systematically a class of thermo-mechanically consistent hydrodynamic equations via the original equations. The plane wave analysis is performed to check their linear stability under small perturbations, which confirms that all re-casted models are spatially and temporally stable like their classical counterpart. We then use the Rayleigh-Brillouin scattering experiments to demonstrate that the re-casted equations may be better suited for explaining some of the experimental data where original Navier-Stokes fail.
Original languageEnglish
JournalJournal of Physics Communications
Early online date7 Oct 2019
DOIs
Publication statusE-pub ahead of print - 7 Oct 2019

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Navier-Stokes
Navier-Stokes Equations
Continuum Model
Brillouin Scattering
Hydrodynamic Equations
Linear Stability
Substitute
Small Perturbations
Rayleigh
Plane Wave
Velocity Field
Vector Field
Continuum
Physics
Experimental Data
Model
Fluid
Configuration
Methodology
Demonstrate

Cite this

Lakshminarayana Reddy, M. H. ; Dadzie, Kokou ; Ocone, Raffaella ; Borg , Matthew K. ; Reese, Jason M. / Recasting Navier-Stokes equations. In: Journal of Physics Communications. 2019.
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Recasting Navier-Stokes equations. / Lakshminarayana Reddy, M. H.; Dadzie, Kokou; Ocone, Raffaella; Borg , Matthew K.; Reese, Jason M.

In: Journal of Physics Communications, 07.10.2019.

Research output: Contribution to journalArticle

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AU - Dadzie, Kokou

AU - Ocone, Raffaella

AU - Borg , Matthew K.

AU - Reese, Jason M.

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AB - Classical Navier-Stokes equations fail to describe some flows in both the compressible and incompressible configurations. In this article, we propose a new methodology based on transforming the fluid mass velocity vector field to obtain a new class of continuum models. We uncover a class of continuum models which we call the re-casted Navier-Stokes. They naturally exhibit the physics of previously proposed models by different authors to substitute the original Navier-Stokes equations. The new models unlike the conventional Navier-Stokes appear as more complete forms of mass diffusion type continuum flow equations. They also form systematically a class of thermo-mechanically consistent hydrodynamic equations via the original equations. The plane wave analysis is performed to check their linear stability under small perturbations, which confirms that all re-casted models are spatially and temporally stable like their classical counterpart. We then use the Rayleigh-Brillouin scattering experiments to demonstrate that the re-casted equations may be better suited for explaining some of the experimental data where original Navier-Stokes fail.

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