If the Transient with Phase Initialization () study is being used, for the initialization to work it is crucial that there are two Initial Values nodes. One of the Initial Values nodes is set to Specify phase: Fluid 1 () and the other to Specify phase: Fluid 2 (). The initial fluid-fluid interface is then automatically placed on all interior boundaries between both phases. The smooth initialization is not used in domains with User defined initial values.
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Studies and Solvers in the COMSOL Multiphysics Reference Manual
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