Parameter

Values

Description

VMOPT

<Integer = 0, 1, 2>

Default = 0

= 0 or 1: the virtual mass of the fluid is included in the mass matrix for all calculations. This can increase the calculation time because of the dense mass matrix on the damp surface of the structure.

= 2: the eigenvalue solution is performed without adding the mass contribution from MFLUID, so that dry modes are calculated. A second eigenvalue analysis is performed to get the damp modes, which are used in modal dynamic solution. This solution is much faster with only a slight loss of accuracy.

Note:  Dry mode output in the .out and .h3d files is available only when PARAM, VMOPT, 2 is specified.