Resumo: A parallel ILU preconditioning
algorithm for the Navier - Sokes equations have been developed. The computational
mesh is divided into N subdomains which are processed in parallel in different
processors.During ILU factorization, matrices and vectors associated with
the nodes on the interface between the subdomains are communicated to the
equation matrices to the adjacent subdomain. The bases for the parallel algorithm
are an appropriante node ordering scheme and a segregation of velocity
and pressure degrees of freedom. The inner nodes of the subdomain is numbered
first and then the nodes on the interface between the subdomains. To avoid
division by zero during the ILU factorization the equations corresponding
to the velocity degrees of freedom are assembled first in the global equation
matrix, and at last the equations corresponding to the pressure degrees of
freedom.