Papers › Metastable and Unstable Dynamics in multi-phase lattice Boltzmann
Metastable and Unstable Dynamics in multi-phase lattice Boltzmann
Matteo Lulli, Luca Biferale, Giacomo Falcucci, Mauro Sbragaglia, Dong Yang, Xiaowen Shan
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We quantitatively characterize the metastability in a multi-phase lattice Boltzmann model. The structure factor of density fluctuations is theoretically obtained and numerically verified to a high precision, for all simulated wave-vectors and reduced temperatures. The static structure factor is found to consistently diverge as the temperature approaches the critical-point or the density approaches the spinodal line at a sub-critical temperature. Theoretically predicted critical exponents are observed in both cases. Finally, the phase separation in the unstable branch follows the same pattern, i.e. the generation of interfaces with different topology, as observed in molecular dynamics simulations. All results can be independently reproduced through the ``idea.deploy" framework https://github.com/lullimat/idea.deploy
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