Ya. Hassan et Hr. Barsamian, New-wall modeling for complex flows using the large eddy simulation technique in curvilinear coordinates, INT J HEAT, 44(21), 2001, pp. 4009-4026
This investigation presents modifications and improvements to the dynamic s
ubgrid scale model and introduces a new-wall model. These modifications are
implemented in the large eddy simulation technique in curvilinear coordina
tes. They are then validated and tested in three-dimensional complex geomet
ries. The large eddy simulation method captures many scales of turbulence u
p to the grid size. A closure model is used to simulate subgrid turbulence.
The Smagorinsky and dynamic subgrid models are presented and tested. The d
ynamic model overcomes many of the deficiencies of the Smagorinsky subgrid
scale model. Spatial and temporal low-pass filters have been introduced in
the dynamic subgrid scale model for numerical stability. Several near-wall
models are considered for the large eddy simulation technique, A local aver
aging technique lends these models to be applicable in complex geometry sit
uations. A new model is introduced which overcomes planar averaging near th
e wall and captures ejection and sweep effects. These models have been impl
emented in a large eddy simulation computer program. Results are validated
and tested in a lid driven cavity flow at Reynolds number of 10 000. A sing
le tube in a channel is simulated to show the applicability of the models t
o complex geometries with attachment and separation as well as end-wall eff
ects. The shedding effect was captured and turbulence statistical character
istics were acceptable. (C) 2001 Elsevier Science Ltd. All rights reserved.