# *BEAM FLUID INERTIA

 Define additional beam inertia due to immersion in a fluid. This option is used in conjunction with the BEAM SECTION or BEAM GENERAL SECTION option to include added inertia effects in Timoshenko beam elements due to immersion in an inviscid fluid.
 Related Topics In Other Guides Beam section behavior Acoustic, shock, and coupled acoustic-structural analysis Loading due to an incident dilatational wave field

ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE

TypeModel data

LevelPartPart instanceAssembly

Abaqus/CAEProperty module

## Optional, mutually exclusive parameters

FULL

Use this parameter to specify a fully submerged beam (default).

HALF

Use this parameter to specify a half-submerged beam.

## Data line to define beam fluid inertia

First (and only) line
1. Mass density of fluid.

2. Local 1-coordinate of the center of the cylindrical cross-section with respect to the beam cross-section, x.

3. Local 2-coordinate of the center of the cylindrical cross-section with respect to the beam cross-section, y.

4. Radius of the cylindrical cross-section, r.

5. Added mass coefficient, $CA$ (default = 1.0), for lateral motions of the beam.

6. Added mass coefficient, $CA-E$ (default = 0.0), for motions along the axis of the beam. This coefficient affects only the term added to the free end(s) of the beam.