The Prescribed Velocity node adds an edge, boundary, or domain condition where the translational or rotational velocity is prescribed in one or more directions. The prescribed velocity condition is applicable for Time Dependent and Frequency Domain studies. With this condition it is possible to prescribe a velocity in one direction, leaving the shell free in the other directions.
The Prescribed Velocity node is a constraint, and overrides any other constraint on the same selection.
This setting is used in conjunction with a Local edge system and
Shell Local System. If the velocity is prescribed for an edge which is shared between boundaries, the edge system can be ambiguous. Select the boundary which should define the edge system. The default is
Use face with lowest number.
To define a prescribed velocity for each spatial direction (x,
y, and
z), select one or more of the
Prescribed in x direction,
Prescribed in y direction, and
Prescribed in z direction check boxes. Then enter a value or expression for the prescribed velocity components
vx,
vy, and
vz.
To define a prescribed angular velocity for each spatial direction (x,
y, and
z), select one or all of the
Prescribed around x direction,
Prescribed around y direction, and
Prescribed around z direction check boxes and enter a value or expression for in each
∂θx/∂t,
∂θy/∂t, or
∂θz/∂t field.
