In this paper, a robust multigrid algorithm is presented for solving t
hree-dimensional incompressible high-Reynolds number turbulent hows on
high aspect ratio grids. The artificial compressibility form of the N
avier-Stokes equations is discretized in a cell-centered finite volume
form on a time-dependent curvilinear coordinate system, and the so-ca
lled discretized Newton-relaxation scheme is used as the iterative pro
cedure for the solution of the system of equations. A nonlinear multig
rid scheme (full approximation scheme [FAS]) is applied to accelerate
the convergence of the time-dependent equations to a steady state. Two
methods for constructing the coarse grid operator, the Galerkin coars
e grid approximation and the discrete coarse grid approximation have a
lso been investigated and incorporated into the FAS. A new procedure,
called implicit correction smoothing that leads to high efficiency of
the multigrid scheme by allowing large Courant-Friedrichs-Lewy numbers
, is introduced in this work. Numerical solutions of high-Reynolds num
ber turbulent bows for practical engineering problems are presented to
illustrate the efficiency and accuracy of the current multigrid algor
ithm.