OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Charged gas in neutral gas › Re: Charged gas in neutral gas December 30, 2018 at 5:20 pm #2981 kolotinskyParticipant If I add viscosity to external force term to describe collisions with neutral gas can I set zero relaxation frequency in MRT operator or simply use BGK operator with zero relaxation frequency?