Simulation of Air Filtration

The challenge: Effectively separating tiny harmful and diverse particles from the air

Air filtration is a crucial process that protects and enhances the quality of the air we breathe both indoors and outdoors. It removes particles, dust, pollen, bacteria, and viruses, thereby improving overall air quality. Various factors such as pore size, material, and overall design of the filter play a critical role in the efficiency of a filter.

Due to the diverse particle sizes and conditions, optimization is a complex process. Simulations offer significant value in this regard by visualizing the filtration process and providing insights into interactions between particles and filter.

With GeoDict, it becomes possible to visualize, simulate, and optimize the air filtration process at both the micro and macro levels. This includes:

  • Permeability determination on the media scale
  • Single-pass filtration simulations
  • Individual particle size distribution
  • Multiscale simulations
  • Consideration of electrostatic attraction
  • Indoor air simulations
  • Systematic parameter studies

As a result, more effective filtration outcomes can be achieved while simultaneously reducing costs in material and energy, leading to a sustainable and significantly faster development cycles for next generation filter.

Features of air filtration


GeoDict can charge either the particles using different methods or charge the filter media itself, to simulate the eletrostatic effects in filter media. It is also possible to simulate the dielectric force, which acts on uncharged particles when entering a magnetic field.



GeoDict can simulate the extraction of droplets from a gas phase. To do this, you'll need to provide input parameters for the contact angle between the fluid phase and the fiber surface.


Slip length

When simulating flow and filtration on the nano scale using nano fibers the effect of the slip length on the nano fibers needs to be considered. GeoDict is able to set the mean free pass of the given fluid to account for the additional effects at the nano scale. For the usage of micro fibers the effect is neglectable.



One additional force which acts on the particles in the filtration process is the Brownian Motion (Diffusion). When simulating smaller particles the particle diffusion needs to be considered, whereas when simulating larger particles, the diffusion of particles plays a minor role and the motion due to the flow is more dominant.


Overview of GeoDict solution highlights

  • Direct 3rd-level support for filtration experts & developers
  • Easy permeability determination of filter media 
  • Single-pass filtration simulations
  • Individual particle size distribution
  • Short computation times on a standard workstation
  • Automated parameter studies
  • State-of-the-art solver for simulation & optimization
  • Modular software solution - customizable to your requirements
  • User-friendly & intuitive user interface

The GeoDict solution for air filtration

The GeoDict package includes, in addition to GeoDict Base, all the necessary modules for the research and development of air filters.


Module recommendations

Image processing and analysis ImportGeo-Vol ImportGeo-CAD
Characterization and analysis FiberFind-AI PoroDict + MatDict
Modeling & Design FiberGeo PleatGeo
Simulation & Prediction FlowDict FilterDict

Which modules suit you best depends on the nature of your application.
Here are the recommended system requirements.

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