Checklist

Useful checklist for airbag modeling:

• All airbag fabric components are meshed with tria elements according to meshing requirements (3-4mm average size)
• Airbag is free from intersections
• If the airbag will be used in a larger simulation, the entity ID numbering is correct based on requirements of the larger model
• The airbag model is divided into /SUBSET representing the airbag external surfaces, vents, internal surfaces, housing, and inflator
• Mass and inertia of the model matches the physical part
• Fabric material data was validated using biaxial, picture frame and uniaxial tests
• Vent holes are modeled
• Porous fabric is modeled
• Gas material for each gas component is modeled
• Inflator is validated using a tank test simulation and comparing the mass flow and temperature curves to the tank test results
• Gas injections starts at TTF defined in /SENSOR T_delay not by offsetting massflow and temperature curves
• The mass flow curve start with non-zero values
• $C_p(T)$ function is increasing monotonically for each gas
• Reference geometry is present either as nodal based /XREF or element based /EREF
• The same /SENSOR is used to activate injection and activate reference geometry in LAW58
• Ambient and internal air material properties are specified
• Either the /FVMBAG1 or /FVMBAG2 card is specified
• Internal airbag contacts defined and penetration check shows no intersections and a maximum penetration amount of 10% of the contact gap
• Stability run is done to check for motion before TTF
• Uniform pressure run is completed, no anchoring of contact nodes
• Stand-alone FVM run is completed, no anchoring of contact nodes and realistic unfolding
• Model runs with required time step
• Number of FV does not reduce to one
• Visual development of the flow (temperature contour plot, fluid velocity vector) is realistic