Multidimensional simulation of air flows and residence times distribution in a ventilated room.
L. Ricciardi, JC. Laborde, Tracers and tracing methods 2001, 29/05-30/05 2001, Nancy.
Prevention of radiological hazards in ventilated rooms of nuclear facility requires knowledge of potential contamination transfers and therefore characterization of air flows. For this purpose, it is common to use an experimental method that relies on determining the room Residence Times Distribution (RTD): the response of a pulse injection of tracer gas at the room inlet can highlight the presence of short circuits, recirculations and dead zones.
However, only overall information is provided by an experimental RTD curve. One solution for obtaining more local information on the flow may be brought by using a multidimensional CFD code. Such a tool can also be used to study air flows in a global way according to different ventilation configurations, without the need of experimental tracing.
We propose in this paper to assess, through the RTD computation, the pertinence of using a CFD code to simulate air flows in a ventilated room. The simulations presented here were carried out with the commercial code CFX-4.3 .