To set the properties for the Coupled Flow model, select Coupled Flow in the Models node under the required continuum node. The properties are available under the Properties and Expert property categories.
The Discretization property switches between first-order and second-order approximations when evaluating face values for convection and diffusion fluxes.
The Integration property switches between implicit and explicit pseudo-time integration.
Since the Coupled Energy model is an extension of the Coupled Flow model it has no properties of its own, but shares those provided by the Coupled Flow Model node.