Efficient and accurate simulations of deformable particles immersed in a fluid using a combined immersed boundary lattice Boltzmann finite element method

T. Krueger*, F. Varnik, D. Raabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The deformation of an initially spherical capsule, freely suspended in simple shear flow, can be computed analytically in the limit of small deformations [D. Barthes-Biesel, J.M. Rallison, The time-dependent deformation of a capsule freely suspended in a linear shear flow, J. Fluid Mech. 113 (1981) 251-267]. Those analytic approximations are used to study the influence of the mesh tessellation method, the spatial resolution, and the discrete delta function of the immersed boundary method on the numerical results obtained by a coupled immersed boundary lattice Boltzmann finite element method. For the description of the capsule membrane, a finite element method and the Skalak constitutive model [R. Skalak, A. Tozeren, R.P. Zarda, S. Chien, Strain energy function of red blood cell membranes, Biophys. J. 13 (1973) 245-264] have been employed. Our primary goal is the investigation of the presented model for small resolutions to provide a sound basis for efficient but accurate simulations of multiple deformable particles immersed in a fluid. We come to the conclusion that details of the membrane mesh, as tessellation method and resolution, play only a minor role. The hydrodynamic resolution, i.e., the width of the discrete delta function, can significantly influence the accuracy of the simulations. The discretization of the delta function introduces an artificial length scale, which effectively changes the radius and the deformability of the capsule. We discuss possibilities of reducing the computing time of simulations of deformable objects immersed in a fluid while maintaining high accuracy. (C) 2010 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)3485-3505
Number of pages21
JournalComputers & mathematics with applications
Volume61
Issue number12
DOIs
Publication statusPublished - Jun 2011
Event6th International Conference for Mesoscopic Methods in Engineering Science (ICMMES-09) - Guangzhou, United Kingdom
Duration: 13 Jul 200917 Jul 2009

Keywords

  • Lattice Boltzmann method
  • Immersed boundary method
  • Finite element method
  • Capsule
  • Simple shear flow
  • Small deformations
  • SIMPLE SHEAR-FLOW
  • RED-BLOOD-CELL
  • NAVIER-STOKES EQUATION
  • ELASTIC MEMBRANES
  • LIQUID CAPSULES
  • ENERGY
  • DEFORMATIONS
  • VESICLES
  • MODELS
  • MOTION

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