Gases or aerosol dispersion prediction is a difficult aspect of ventilation design. CFD enables customers to overcome their design challenges and help them troubleshoot a diverse set of environments including bio-pharma facilities, laboratories, industrial enclosures, warehouses, underground environments, server rooms and office buildings. Modeling gases or smoke in such environments is achieved with different modeling techniques ranging from passive tracers to interpenetrating gas mixture, multiphase flow modeling or discrete element modeling (DEM).
In the case presented here, our customer in the pharmaceutical industry required quantification of airborne particle contaminants for a refurbishment. The simulations allowed to evaluate the contaminant removal effectiveness using a virtual tracer gas in the production facility. The room that was considered is used as a storage location for aseptic instruments and is redesigned to introduce new filtration modules. The simulations compared numerous configurations for air extraction. Contamination sources were evaluated, and a tracer gas was used to calculate the contaminant removal effectiveness for each design. The most effective configuration was identified before any construction work began, which allowed our customer to mitigate the risk and carry out the refurbishment with confidence. Finally, the behavior of the smoke tests using a fog generator had been predicted accurately with the model, making the final on-site verification a formality.
- Geometry parametrization for optimization runs
- Volumetric meshing using polyhedral cells and prism layers for finite volume method
- Configuration of physical models and numerical parameters
- Setup of turbulence models
- Evaluation of contaminant sources
- Evaluation of contaminant concentration throughout the domain and at extraction points
- Test case for parameters validation and mesh independency
- Simulations monitoring
- Post-processing of CFD solutions: contaminant removal effectiveness and visualisations
- Comparison of configurations
- Presentation of results and recommendations to the end customer and production of all methodology and substantiation reports
TOOLS AND METHODS USED
Based on the client’s needs, Creaform used the following tools and methods:
- Passive scalar (tracer gas)