A Lagrangian-Eulerian framework for simulation of transient viscoelastic fluid flow
Journal article, 2019

A novel framework for simulation of transient viscoelastic fluid flow is proposed. The viscoelastic stresses are calculated at Lagrangian nodes which are distributed in the computational domain and convected by the fluid. The coupling between the constitutive equation and the fluid momentum equations is established through robust interpolation with radial basis functions. The framework is implemented in a finite volume based flow solver that combines an octree background grid with immersed boundary techniques. Since the distribution of the Lagrangian node set is performed entirely based on spatial information from the fluid solver, the ability to simulate flows in complex geometries is therefore as general as for the fluid solver itself. In the Lagrangian formulation the discretization of the convective terms in the constitutive equations is avoided. No re-formulation of the constitutive equation is required for stable solutions. Numerical experiments are performed of UCM and Oldroyd-B fluids in a channel flow and of a four mode PTT fluid in a confined cylinder flow. The computed flow quantities consistently converge and agree excellently with analytical and numerical data for fully developed and transient flow.

Non-Newtonian flow

Computational fluid dynamics

Confined cylinder

Rheology

Immersed boundary methods

Author

Simon Ingelsten

Chalmers, Industrial and Materials Science

Fraunhofer-Chalmers Centre

Andreas Mark

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Fraunhofer-Chalmers Centre

Fredrik Edelvik

Fraunhofer-Chalmers Centre

Journal of Non-Newtonian Fluid Mechanics

0377-0257 (ISSN)

Vol. 266 20-32

Subject Categories

Applied Mechanics

Computational Mathematics

Fluid Mechanics and Acoustics

DOI

10.1016/j.jnnfm.2019.02.005

More information

Latest update

3/13/2019