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Solid body motions

This chapter shows how a simulation with a solid body motion should be set up on the SimScale platform.

Solid body motions (Fluid dynamics)

Solid body motion can be used to simulate movement of computational domain as a whole.

Preparation

Solid body motion does not require a special mesh preparation as the motion is applied to all of the domain. However, it is important to make sure the produced mesh is of high quality so the prescribed motion could be resolved in an accurate and robust way.

Creation of a solid body motion

In the tree, navigate to “Advanced Concepts” and add a solid body motion. Several motion types are supported:

  • Axis rotation motion

    The type defines the a rotating motion using a rotation center and a radial velocity.

  • Linear motion

    The prescribed motion is a linear motion defined by a velocity vector.

  • Oscillating linear motion

    This type defines an oscillating linear motion using an amplitude and angular velocity.

  • Oscillating rotating motion

    This type allows an oscillating motion around the rotation center with a prescribed amplitude vector and an angular velocity.

  • Rotating motion

    This motion is similar to Axis rotation motion, defined by rotation center, rotation axis, and angular velocity.

  • Ship design analysis (SDA)

    This type mimics the movement of a floating body by specifying sinusoidal roll, heave, and sway components of motion.

  • Six degree-of-freedom motion

    This model allows complete freedom to translate and rotate for a rigid body. A detailed setup guide is available in Six degree-of-freedom motion.

Defining a solid body motion

Defining a solid body motion

In this example, an oscillating linear motion is define for a tank. The motion is specified by an amplitude vector and and angular velocity.

Solid body motions (Yade solver)

In a Particles analysis Solid body motions can be used to define a movement of bounding geometry parts. It does not apply for the Filling zones containing the particles itself.

Translation along axis

In order to define a translational movement of a geometry part, the translation axis and the velocity of the body have to be provided. If the velocity is not constant or the translation does not happen from the beginning as for example for a start up process you can also define a time dependent table or formula value.

Rotation around axis

A rotational solid body motion can be added by defining an angular velocity and the rotation axis. As reference point for the rotation axis you can either provide the point coordinates or use the centroid of the shape, which describes the geometrical center of the geometry. If the angular velocity is not constant or starts after a temporal delay you can also define a time dependent table or formula value.