Rigid Domain

Add the node and select one or more edges (2D: boundaries) to make them a rigid body. is a material model, with only two material properties: the mass densities of the pipe and the fluid.

It is common that the material data for the fluid and the pipe material are in located in different nodes. Only one material can however be assigned to a certain edge. For this reason, the assignment of material data can be made not only using the material assigned to the edge, but by accessing any node present in the component.

By default, an node is added (see Initial Values (Rigid Domain)).

You can add functionality to the rigid domain through the following subnodes:

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Fixed Constraint (Rigid Domain) to fully constrain the rigid domain.

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Prescribed Displacement/Rotation to prescribe the displacement of individual degrees of freedom.

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Mass and Moment of Inertia (Rigid Domain) to add extra mass and moment of inertia in a given point.

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Spring Foundation (Rigid Domain) to add a translational or rotational spring or damper in a given point.

In this section, you enter the density of the fluid.

For input of the , ρf, select either or . When using , also select the material to use in the list. This list contains all materials present in the component, as well as the default choice . When is selected, the material currently assigned to the edge (2D: boundary) is used.

For , enter a value or expression.

In this section, you enter the density of the pipe material.

For input of the , ρ, select either or . When using , also select the material to use in the list. This list contains all materials present in the component, as well as the default choice . When is selected, the material currently assigned to the edge (2D: boundary) is used.