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The spurious currents observed in multiphase flow simulations withpseudo-potential lattice Boltzmann (LB) models are usually understood to be theresult of the lack of isotropy of the model-generated interaction force betweenphases. Remedies have been proposed to utilize larger stencils to compute theinteraction force with higher orders of isotropy. In this short communication,we point out the incompleteness in the current understanding and propose a newconsistent implementation to more effectively suppress the spurious currents.We also demonstrate theoretically that certain low-level spurious currentscannot be eliminated by increasing isotropy if the local hydrostatic balanceinside the diffuse interface is not established in the LB models.

Isotropy and spurious currents in pseudo-potential multiphase lattice Boltzmann models