The effectiveness of renumbering for the incomplFte Cholesky con'ugate gradient solver, which I S usually a plied to direct solvers, is examined quantitative& by analyzing 3-D standard benchmark models. On an acceleration factor which IS introduced to obtain convergence quickly, indices for determining the optimum value of the acceleration factor, which minimizes the number of iterations are discussed. It is found that the renumbering is effective to use with the ICCG solver, and the solver usin the acceleration factor gives a good convergence ciaracteristic even in the case when the conventional solver fails to provide convergent solutions.
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