Coupling features are available from the context menu (right-click the Multiphysics Couplings node) or from the Physics toolbar, Multiphysics menu.
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For the Particle Tracing for Fluid Flow interface, under Particle Release and Propagation, the Particle release specification is set to Specify mass flow rate.
The Drag Force node is added to the Particle Tracing for Fluid Flow interface. The Domain Selection is the same as that of the Particle Tracing for Fluid Flow interface.
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The Domain Selection is the same as that of the participating physics interfaces.
The corresponding Laminar Flow and Particle Tracing for Fluid Flow interfaces are preselected in the Fluid-Particle Interaction section.
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In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
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The available physics features for The Single-Phase Flow, Laminar Flow Interface are listed in the section Domain, Boundary, Pair, and Point Nodes for Single-Phase Flow in the COMSOL Multiphysics Reference Manual.
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