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The liquid-gas density ratio is a key property of multiphase flow methods tomodel real fluid systems. Here, a chemical-potential multiphase latticeBoltzmann method is constructed to realize extremely large density ratios. Thesimulations show that the method reaches very low temperatures, at which theliquid-gas density ratio is more than 10^14, while the thermodynamicconsistency is still preserved. Decoupling the mesh space from the momentumspace through a proportional coefficient, a smaller mesh step provides denserlattice nodes to exactly describe the transition region and the resultingdimensional transformation has no loss of accuracy. A compact finite-differencemethod is applied to calculate the discrete derivatives in the mesh space withhigh-order accuracy. These enhance the computational accuracy of the nonidealforce and suppress the spurious currents to a very low level, even if thedensity ratio is up to tens of thousands. The simulation of drop splashingverifies that the present model is Galilean invariant for dynamic flow field.An upper limit of the chemical potential is used to reduce the influence ofnonphysical factors and improve the stability.

Chemical-potential Multiphase Lattice Boltzmann Method with Superlarge Density Ratios