Introduction

*AIRBAG_SIMPLE_AIRBAG_MODEL
Airbag Deploys into Cylinder
LS-DYNA Manual Section: *AIRBAG_SIMPLE_AIRBAG_MODEL

Additional Sections:
*CONTACT_NODES_TO_SURFACE
*RIGIDWALL_PLANAR

Example: Airbag Deploys into Cylinder

Filename: airbag.deploy.k

Description:
An airbag inflates below a rigid cylinder, causing the cylinder to fly
into the air.

Model:
The volume pressure relationships is defined by the Simple Airbag Model
for control volumes.
The bag inflates through the flow of mass into the bag.

Input:
The control volume defines the thermodynamic relationship for the gas in
terms of parameters such as heat capacity, gas temperature, incoming mass,
and out going m ass (*AIRBAG_SIMPLE_AIRBAG_MODEL). A rigidwall is used below
the airbag to act as ground (*RIGIDWALL_PLANAR). A ground is displayed using
rigid shell elements, but is used only for visualization purposes. The contact
between the airbag and the cylinder is automatically generated by part id
(*CONTACT_NODES_TO_SURFACE).

Results:
The plots show the bag expanding. The ASCII file abstat contains information
on the computed pressure, volume, mass flow and internal energy of the control
volume (*DATABASE_ABSTAT).