Dear colleagues, 

We are pleased to invite you to participate and contribute to 
the 2022 International CFD Challenge on Violent Expiratory 
Events. The objective of this challenge is to assess the 
ability of RANS and/or LES to reproduce both the 
hydrodynamics of a prototypical rapid exhalation mimicking a 
mild cough and the dispersion of the resulting aerosol cloud 
in an idealized environment. The impact of turbulence 
modelling will be determined by comparing selected transport 
metrics to existing DNS results. Further information about 
the Challenge can be found in the attached document and at: 
 
https://coughcfdchallenge.wordpress.com/ 
 
The important dates are: 

October 1, 2021: Challenge Announcement. 

October 15, 2021: Challenge starts. 

May 1, 2022: Deadline for results submission. 

June 27, 2022: Virtual workshop. All teams are expected to 
participate, present and discuss their results and 
conclusions. 

Fall 2022: Paper submission. The outcomes of the challenge 
will be presented in a single paper led by the organizers and 
co-authored by all challenge participants. 

The Challenge is open to all the CFD community so feel free 
to share this announcement with your colleagues.  

We hope that this exercise will contribute to a better 
understanding of the performance of the typically used 
turbulent transport models and parameterizations for the 
prediction of short-term dispersion of pathogen laden 
aerosols generated in violent expiratory events.  

Should you have questions or need additional information, do 
not hesitate to contact us by email at 

coughcfdchallenge@gmail.com 

Best regards, 
 
The organizing committee 

Jordi Pallares, Alex Fabregat, Salvatore Cito and Cristian 
Marchioli* 
 
Dept. of Mechanical Engineering. Universitat Rovira i 
Virgili. Tarragona. Spain 

*Dept. of Engineering and Architecture. University of Udine. 
Udine. Italy