Use the Thin-Film Damping node to apply boundary loads to the surface of a resonator that result from squeeze-film or slide-film damping. Squeeze-film damping occurs when a thin film of gas is “squeezed” between two parallel plates, one of which is in motion normal to its surface. Slide-film damping occurs in similar situations except that the direction of motion of the moving plate is tangential to its surface. Examples of common situations in which these types of damping are appropriate are parallel-plate capacitive and comb-drive actuators for squeeze-film and slide-film damping, respectively. The thin-film damping boundary condition can accommodate general displacements of the moving plates specified by means of the
Fluid-Film Properties node.
The Thin-Film Damping node is only available with some COMSOL products (see
http://www.comsol.com/products/specifications/).
The Fluid-Film Properties node and the
Border node are added by default. These additional subnodes are available:
Fluid-Film Properties,
Border,
Inlet,
Outlet,
Wall, and
Symmetry.
