PARAM, ACMTXNO

Bulk Data Entry This parameter sets preferences for storage of reduced fluid mass, fluid stiffness, and fluid damping matrices for acoustic superelements.

Parameter Values Description
ACMTXNO <YES, NO>
YES
For acoustic superelements with this parameter set, the reduced fluid mass, fluid stiffness, and fluid damping matrices are not stored. Only the fluid-structure interface matrix is stored for these acoustic superelements.
NO (Default)
For acoustic superelements, the reduced fluid matrices are stored along with the fluid-structure interface matrix.

Comments

  1. Assuming that there are N acoustic superelement models that share a single contiguous fluid cavity, PARAM,ACMTXNO,YES can be added to N-1 of these superelement generation models to avoid storing the reduced fluid mass, fluid stiffness, and fluid damping matrices in all the N-1 superelements. The Nth superelement can be generated without this parameter and these N superelements can then be used in a residual run. These superelements can also be turned into design variables using DMIGDV on CMSMETH.
  2. The physical fluid cavity can be optionally included/excluded in the residual run.