) and choose the pairs to add from the list in the Add dialog box that opens; then click OK. A pair has to be created first. See Identity and Contact Pairs for more details.) and choose the pairs to add from the list in the Add dialog box that opens; then click OK. A pair has to be created first. See Identity and Contact Pairs for more details.
) and select Advanced Physics Options in the Show More Options dialog box. The Constraint settings can be set to Pointwise constraints (default), Weak constraints or Nitsche constraints. Select Weak constraints to replace the standard constraints with a weak implementation. Select Nitsche constraints when Pointwise constraints and Weak constraints do not work satisfactorily.
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The Nitsche constraints option is especially useful to prevent oscillations on inlet boundaries where convection dominates. Unlike the Pointwise constraints and Weak constraints, these constraints do not enforce the temperature on the boundary extremities. This is relevant on fluid inlets where the temperature condition should not be enforced on the walls at the inlet extremities. Note that Nitsche constraints are not supported for resistive thin layers or with turbulent wall functions.
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