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In meling or solidification case, users have to define source term to dampen the momentum and turbulence equation when there is solid or solid forms, this sometimes can cause the temperature to go unphysically. For example, the temperature can drop a little bit below the initial temperature even if the whole domain is insulated and no heat is taken out of the domain. To avoid this, user has to toggle on "Incl. coeff. in Rhie Chow" below the general momentum source tab in the subdomian panel which indicates whether momentum source coefficient modifies the Rhie Chow coupling term in the continuity equation.
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