FDS Wall Flows. Part 1: Straight Channels.
FDS Wall Flows. Part 1: Straight Channels.
(526 K)
McDermott, R. J.
NIST Technical Note 1640; NIST TN 1640; 18 p. July
2009.
Keywords:
turbulent flow; laminar flow; stress (mechanics);
Reynolds number; wildland urban interface; formulation;
fire models
Abstract:
We perform calculations of 2D laminar and 3D turbulent
channel ow with periodic streamwise boundary conditions.
From the laminar results we verify that the Fire
Dynamics Simulator (FDS) wall boundary condition is
second-order accurate. For the turbulent cases we adapt
the wall stress model of Werner and Wengle to FDS and
verify the implementation by replicating the Moody
diagram, a plot of friction factor versus Reynolds
number for turbulent pipe flow.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899