D3PLOT 22.1
Continuum-based Airbag Particle Gas (CPG)
Continuum-based Airbag Particle Gas (CPG) data components
From release 22.0 D3PLOT processes CPG particle elements.
CPG is a new continuum-based particle approach for airbag simulations, available from Ansys LS-DYNA 2025R1 (R16).
As a fully functional fluid solver, CPG is more effective at simulating gas flow than the corpuscular particle method (CPM), and more capable at internal fluid-structure interaction than ALE.
Key features:
- Compressible Navier-Stokes solver coupled with an ideal gas equation of state.
- Meshless by design, based on a generalized finite-difference scheme.
- Particle cloud fills airbag volume, gas passes from particle to particle (Eulerian approach).
- Particles added or removed only when necessary.
- Excellent accuracy, robustness & scalability to hundreds of cores.
The first release (May 2025) supports internal structures, simple venting, fabric porosity, multiple gases/orifices/inflators, moving environment, local particle refinement, and more. CPG is destined to take airbag simulation to the next level required for virtual testing. However, accurate input data and well-folded models are also vital to achieve useful results.
The CPG particles are similar to ABP particles in that the way they act upon the fabric of the bag is to effectively make contact with it and hence apply force, mimicking the true behaviour of actual gas particles – albeit on a much larger scale. Within D3PLOT, the CPG particles are treated as elements and data values that are contourable are displayed in the 2D/3D plotting mode.