SF-98-10-2 -- Application of a Large Eddy Simulation Model to Study Room Airflow PDF

A three-dimensional, large eddy simulation (LES) model developed for studying the transport of smoke and hot gases during a fire in an enclosure is described. The model uses finite difference techniques to solve the Navier-Stokes equations with an approach emphasizing high spatial resolution and efficient flow-solving techniques. The model uses the Smagorinsky subgrid-scale model. The LES model with Smagorinsky subgrid-scale model was applied to ventilation airflow in a three-dimensional room. Airflow results were in excellent agreement with both measured values and LES simulations with the more complicated, dynamic SGS model (reported by Davidson and Nielsen 1996) in the main portion of the room. Agreement was not as good near the floor and ceiling; however, no empirical near-wall model was used. Also, some interaction between Smagorinsky constant and grid resolution was found.

Units: SI