# Fluid Materials

## Definition

Fluid material with losses.

## Description

General
COMP' | Bulk Modulus | Pa or N/m2
| Density | kg/m3

Losses
COMP" | Imaginary part of the Bulk Modulus
Must verify COMP" ≥ 0

Magnetic
Relative magnetic permeability
Superpose magnetic domain to elastic domain

## Illustration

## ATILA Implementation

- Interface elements (between solid and fluid regions of the model) are automatically added by the ATILA-GiD interface.
- The orientation of interface and radiating elements is assigned by the ATILA-GiD interface, independently from the orientation of the elements within GiD.
- When the magnetic permeability is enabled, the mesh is "duplicated" so that a magnetic field computations can be performed on top of the elastic domain. Thus, both domains share the same nodes. This feature is typically used in magnetostrictive problems.

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