Effects of molecular mass on the diffusion coefficient in a multiphase lattice Boltzmann model |
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| Authors: | Elizabeth B Liu Markus Hilpert |
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| Institution: | (1) Alfred Wegener Institute for Polar and Marine Research, Postfach 12 01 61, D-27515 Bremerhaven, Germany |
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| Abstract: | We introduce a simplified expression for the diffusion coefficient (D) of a multicomponent Lattice Boltzmann model. For dilute solutions, this expression is reduced to have dependence only on
the molecular mass and relaxation time of the solute. By altering the molecular mass, the value of D can be varied by several orders of magnitude, thus, providing an additional parameter for use in tuning LB model values to
physical systems. The ability to adjust the values of molecular mass can also be used to decrease simulation times. This is
advantageous as it allows application of the LB model to solve problems that previously required prohibitive computational
resources. The capability to model a wide range of diffusion coefficients and decrease simulation times is illustrated in
a simple case study. |
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