Robustness improvement of polyhedral mesh method for airbag deployment simulations

In this project the problem of determining the inner and outer regions of the computational domain for an airbag deployment simulation is addressed. One approach to perform such simulation is via the structural equations of motion for the airbag fabric dynamics, Euler equations of fluid motion for the fluid inside the airbag and a coupling algorithm which defines the dependence between the two systems of equations. The airbag fabric is discretized as triangular finite elements, and the Finite Volume mesh for the CFD solution inside the airbag is formed by two types of cells: structured cubic cells which have no interaction with the airbag fabric, and unstructured cells which are cubic cells that intersect with the airbag triangulation. The unstructured cells that intersect the triangulation are called cut-cells and a proper description of their geometry is required to obtain an accurate solution via the finite volume solver. Two geometric properties of the cut-cells are particularly important: the exact geometry, i.e. the areas of the sec- tions of the cell faces inside the flow, which is needed for proper calculations of the fluxes, and the characterization of the regions of the cut-cells as interior or exterior to the flux. Developing a robust algorithm to determine the inside/outside regions of the cut-cells is the goal of this project.

Subject

Cartesian Mesh
cut cell
air bag
arbitrary lagrangian eulerian
point in polyhedron
Geometrical Modeling
Simplicial chain

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Student theses

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master thesis

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