This is a reference case setup for the paper titled "Numerical Study on the Impact of Large Air Purifiers, Physical Distancing, and Mask Wearing in Classrooms"
Authors: Aman Jain, Finn F. Duill, Florian Schulz, Frank Beyrau, and Berend van Wachem.

The software used is OpenFOAM version 8.
About OpenFOAM

OpenFOAM is a free, open-source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation.
Copyright

OpenFOAM is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. See the file LICENSE in this directory or http://www.gnu.org/licenses/, for a description of the GNU General Public License terms under which you can copy the files.

Case setup:
Air purifier placed at the short side of the room.
Level 1 volumetric flow rate: 800 m^3/hr
Capacity: 24 students + 1 Teacher
For more details, please refer to the paper.

To calculate the evolution of aerosol concentration from an infected person, a frozen flow field approach is used.
First, the steady-state airflow is calculated by using the bouyantSimpleFoam solver.
Then the aerosol concentration is calculated for four cases (given in the paper) using the flow developed in the first stage.
To calculate the aerosol concentration, a customized solver was used, which is contained in the folder "aerosolConcentrationSolver".

Files for the first stage are in this folder. The case setup file contains:

    0.orig folder which defines the boundary conditions.
    system folder which contains files to define parameters of the solver.
    constant folder which contains information about the properties of the fluid and the stl file for meshing.
    runmesh file which can be run to generate the mesh using OpenFOAM v8 software.
    run file which can be run to the actual solver to generate the flow field.

Files for the second stage are contained in the aerosol folder.

    0.orig folder contains boundary conditions and initial values of the frozen flow field from the previous stage.
    constant folder which contains information about the properties of the fluid and the stl file for meshing.
    2400 folder which contains the final results and can be viewed using paraview.
    run file which can be run to the actual solver to generate the flow field.