Simulation of the Airbag Deployment Process in “Out of Position” Load-Cases

NAFEMS International Journal of CFD Case Studies

Volume 6, January 2007

ISSN 1462-236X

Simulation of Turbulent Swirling Flows: Gas Turbine Combustor Application and Validation

U Göhner and A Haufe
DYNAmore GmbH, 70565 Stuttgart, Germany

https://doi.org/10.59972/1mh6ehmz

Keywords: Fluid-Structure-Interaction, Comparison, Control Volume Technique, Euler Lagrange Coupling, Airbag Deployment, Out-of-Position Load Case, LS-DYNA

Abstract

Many accidents with children or small adults, where the ignition of the airbag leads to dangerous and even fatal injuries for the passengers, have led to a number of efforts to analyse this so-called “Out-of- Position” load case more deeply within the development process of an airbag system. In the framework of simulation systems the fluid-structure interaction between the inflating gas and the airbag fabric has not been taken into account in the past. Recent developments in the LS-DYNA software package allow a fully coupled arbitrary Lagrange-Euler formulation and thus a more exact representation of the airbag deployment process within the simulation system. In the present contribution we will describe the standard procedure, based on the assumption of a uniform pressure distribution in the airbag and the recently achieved advances in LS-DYNA with respect to fluid-structure interaction of the expanding gas and the inflating airbag fabric.

References

[1] Fokin, D., Lokhande, N., Fredriksson, L. (2003), „On Airbag Simulation in LS-DYNA with the use of the Arbitrary Lagrangian-Eulerian Method”, 4th European LS-DYNA Users Conference, May 22-23 ,2003, Ulm, Germany.

[2] Hirth, A., Haufe, A. (2003), „ALE-Methode zur Airbagberechnung – Beispiele aus der Automobilindustrie“, LS-DYNA Update 2003, 11. November 2004, Stuttgart, Germany.

[3] Olovsson, L. (2000) "On the Arbitrary Lagrangian-Eulerian Finite Element Method" Ph. D. Thesis, Linköping University.

[4] Olovsson, L. (2004) "ALE and Fluid Structure Interaction" Training class for LS-DYNA, DYNAmore GmbH, Stuttgart, Germany.

[5] Olovsson, L. (2003), „*MAT_GAS_MIXTURE, a new gas mixture model for airbag applications”, 4th European LS-DYNA Users Conference, May 22-23 ,2003, Ulm, Germany.

[6] Marklund, P.-O., Nilsson, L. (2002), “Simulation of Airbag Deployment using a coupled Fluid-Structure Approach”, 7th International LS-DYNA Users Conference, 2002, Detroit, USA.

[7] Van Leer, B., “Towards the Ultimate Conservative Difference Scheme. IV. A New Approach to Numerical Convection,” Journal of Computational Physics, 23, 276-299 (1977).

[8] Wall, W. A. (1999), "Fluid-Struktur-Interaktion mit stabilisierten Finiten Elementen", Ph.D: Dissertation, Report No. 31, Institute for Structural Mechanics, University of Stuttgart, Germany.

[9] Wang, J. T., Nefske, D. J. (1988), "A new CAL3D Airbag Inflation Model" Int. Cong. Expo., SAE 880654, Detroit.

Cite this paper

U Göhner, A Haufe, Simulation of Turbulent Swirling Flows: Gas Turbine Combustor Application and Validation, NAFEMS International Journal of CFD Case Studies, Volume 6, 2007, Pages 5-14, https://doi.org/10.59972/1mh6ehmz