Abstract: A multiblock/multigrid method is developed in SIMPLEC algorithm with a layout of staggered grid on generalized curvilinear coordinates. Application to the peculiar construction of inlet particle separator in helicopter breaks through the limit of multigrid methods applying to multiply connected regions and makes complex problem simple. Results show that this multiblock/multigrid method can improve not only convergence, but also accuracy.

Key words: multiblock/ multigr id, inlet part icle separat or, curvilinear coor dinat e