Functional Entropy Variables: A New Methodology for Deriving Thermodynamically Consistent Algorithms for Complex Fluids, with Particular Reference to the Isothermal Navier-Stokes-Korteweg Equations

Abstract

We propose a new methodology for the numerical solution of the isothermal Navier-Stokes- Korteweg equations. Our methodology is based on a semi-discrete Galerkin method invoking functional entropy variables, a generalization of classical entropy variables, and a new time integration scheme. We show that the resulting fully discrete scheme is unconditionally stable-in-energy, second-order time-accurate, and mass-conservative. We utilize isogeometric analysis for spatial discretization and verify the aforementioned properties by adopting the method of manufactured solutions and comparing coarse mesh solutions with overkill solutions. Various problems are simulated to show the capability of the method. Our methodology provides a means of constructing unconditionally stable numerical schemes for nonlinear non-convex hyperbolic systems of conservation laws.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2012
Accession Number
ADA572015

Entities

People

  • Chad M. Landis
  • Hector Gomez
  • John Andrew Evans
  • Ju Liu
  • Thomas J.R. Hughes

Organizations

  • University of Texas at Austin

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Computational Fluid Dynamics
  • Computational Science
  • Computer-Aided Design
  • Critical Temperature
  • Differential Equations
  • Engineering
  • Equations
  • Free Energy
  • Geometry
  • Navier Stokes Equations
  • Nonlinear Systems
  • Numerical Analysis
  • Phase Transformations
  • Stratified Fluids
  • Surface Tension
  • Thermodynamic Properties

Fields of Study

  • Mathematics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Linear Algebra