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Theory of the Viscoelasticity of Gases and Simulations with a Viscoelastic, Two-Component Lattice Boltzmann Method

Dr. Alexander Wagner
Department of Materials Science
Massachusetts Institute of Technology
October 29, 1999
Lattice Boltzmann methods have proven useful for the simulation of fluid flows, especially in the area of multicomponent flows. We have studied the possibility of implementing viscoelastic lattice Boltzmann methods and have implemented a two component model. In this talk we present some theoretical consideration of the viscoelastic limit of the continuous Boltzmann equation and show simulation results for a bubble rising in a viscoelastic liquid and some new results in viscoelastic phase separation. In particular we have observed an anomalously slow growth regime, first observed experimentally by Tanaka, and seen non-universality in the scaling state.

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