Linearly Accelerated Frame

When you add a node, inertial forces are applied to all selected features in the physics interface with a density, mass, or mass distribution. You select objects having the highest geometrical dimension of the interface, and all objects with a lower dimensionality that belong to the selection are automatically included.

The fluid in the pipe is included in the direction transverse to the pipe, but not in the axial direction. To include the inertial load in the axial direction caused by mass of the fluid, you will typically have to add extra point loads at discontinuities like pipe bends.

Coordinate System Selection

The is selected by default. The list contains any additional coordinate systems that the model includes. It can be used when prescribing the direction of the frame acceleration.

Enter the components of the linear , af. The force is computed as f = −ρaf and acts in a fixed spatial direction.

Time-Dependent Study

For a time-dependent study, you can compute the absolute velocity and absolute displacement postprocessing variables by checking the corresponding check boxes.


	Frame Acceleration Forces


	Only features that have a geometrical selection contribute to the mass forces. The Mass and Moment of Inertia nodes are global features and will not get any contribution from Linearly Accelerated Frame. You may need to add extra force contributions if such nodes are present.

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You can add a Harmonic Perturbation subnode for specifying a harmonic variation of the values of the prescribed acceleration.

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You can assign this load to a load group. See Load Cases in the Structural Mechanics Modeling chapter.

Location in User Interface

Context Menus

Ribbon

Physics tab with selected: