Can you please be more clear about CFD? Thanks

 computational fluid dynamics

Dear Neha Gupta,

Regarding to your question, I think you may firstly read some summery type references. I list two papers for your references:

1. Chen Q. Ventilation performance prediction for buildings: A method overview and recent applications. BUILDING AND ENVIRONMENT. 209. 44:848-858

2.  JONES, PJ; WHITTLE, GE. COMPUTATIONAL FLUID-DYNAMICS FOR BUILDING AIR-FLOW PREDICTION - CURRENT STATUS AND CAPABILITIES. BUILDING AND ENVIRONMENT. 1992. 27: 321-338

You can vent the room in which you are setting up your CFD simulations, as the most direct example. 

Another example, although not quite ventilation but more cooling, is applied through fans in the computers on which you run CFD.