In the first part of this study the results of the solution of the Navier-Stokes-Equations using the Lattice Boltzmann Method and the Finite Volume Method for the flow through regular fiber structures are compared and opposed to measurements. In the second part virtually generated nonwoven structures based on geometrical parameters like porosity, fiber diameters, media thickness and anisotropy of real metal nonwovens as an alternate to the costly digitalization of cutouts of the real media is reviewed. The resulting flow field serves as a basis for a Lagrangian particle simulation and their initial deposition in the media. Pressure drop and collection efficiency are compared to measurements. The importance of proper consideration of particle bouncing off the fibers for simulation of filter efficiency and lifetime is illustrated by additional comparison with approximations from literature.
Generation of Three Dimensional Nonwoven Structures for Simulation of Fluid Flow and Particle Deposition