Use the Interior Velocity node to specify a velocity on an interior boundary in thermoviscous acoustics. Add this node from the
Interior Conditions submenu.
Select the Coordinate system to define the orientation of the prescribed quantities (the velocity). The default is the
Global coordinate system, any other applicable system will be listed.
To define a prescribed velocity for each space direction, 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 velocities
u0x,
u0y, or
u0z (SI unit: m/s), here given in a 3D component and for the
Global coordinate system selection. The prescribed values that you specify are interpreted in the selected
Coordinate system and space dimension.
Select the Continuous pressure check box if the velocity condition is to be used as a source where the pressure should not be slit.
Select a Thermal condition —
Isothermal (the default) or
Adiabatic. See the
Isothermal and
Adiabatic conditions for further details.