DNSlab is a software for analysis and simulation of mass transport and deposition especially in microporous filter media. The computation of gas or liquid flow fields in 3D models of the media is used for the determination of the permeability, the filter efficiency and filter cake build-up and backwashing, amongst others.

DNSlab provides Finite Differences (FD) and Lattice-Boltzmann (LB) schemes to compute flow fields. The FD schemes are advantageous for slow creeping flows, the LB schemes for faster inertial flows. DNSlab’s FD schemes feature low memory consumption and ultimate numerical stability for creeping flows, as they always converge for any 3D geometry.

The contribution shows the recent FD scheme improvements in DNSlab, which enable the users to run simulations faster with larger, more representative 3D models, and less computing resources. A typical nonwoven model is used to compare the performance of the different FD scheme versions. The simulations are run on a practicable low-cost gaming PC.

The 2024 version has the lowest computing time, the lowest memory requirement and gives the most precise result on the non-coarsened voxel grid, meaning that it performs...