The Fluid–Pipe Interaction (
) multiphysics node provides a way to transfer fluid loads from the Pipe Flow interface to the Pipe Mechanics interface.
The Label is the multiphysics coupling feature name. The default
Label (for the first multiphysics coupling feature in the model) is
Fluid–Pipe Interaction 1.
The Name is used primarily as a scope prefix for variables defined by the coupling node. Refer to such variables in expressions using the pattern
<name>.<variable_name>. In order to distinguish between variables belonging to different coupling nodes or physics interfaces, the
name string must be unique. Only letters, numbers, and underscores (_) are permitted in the
Name field. The first character must be a letter.
The default Name (for the first multiphysics coupling feature in the model) is
fpipe1.
By default, the selection is set to All edges. However, only edges that belong to both the Pipe Flow and Pipe Mechanics interfaces are applicable. This is deduced automatically using the selections made on the coupled physics interfaces.
You can also select None from either list to uncouple the
Fluid–Pipe Interaction node from a physics interface. If the physics interface is removed from the
Model Builder, for example
Pipe Mechanics is deleted, then the
Structure list defaults to
None as there is nothing to couple to.
Select the Drag Force check box to include the forces from viscous drag along the pipe.
Select the Centrifugal Force check box to include centrifugal forces from the fluid in curved pipes.
Select the Pipe flow pressure check box to include effects of the internal pressure in the pipe. When
Pipe flow pressure is selected, you can also enter an external pressure. Select a method for entering the
External pressure,
po, —
User defined or
Common model input.
For User defined, enter a value or an expression for the external pressure.
Select the Junction forces check box to include local forces occurring at various connections and components in the piping system.
