1. 3078,P. 1-10. computation. Fora Reynolds number of 106,with-the multigrid solution procedure described above, the speed-up ratio, in terms of total workunit ratio,obtained fortwomultigrid levels is 2.37,andthatobtainedusingall three multigrid levels is 3.39. For a Reynolds number of 800thecorrespondingspeed-upsare 1.28and 1.72.Figure 16showsacomparisonbetweentheconvergencepathsof the single-level and multi-level computations for both Reynolds numbers. The speed-up ratios obtained for this configurationshowsthatevenforverycomplexcomposite grid configurations, the multigrid efficiency is largely maintained even with the use of composite gridding. In general, for any composite grid configuration, the maximum attainable speed-up ratio will be determined roughly by the smallest grid block of the composite grid system. For the baffleflow, the smallestgrid block has a resolution of 21x53 nodes (blocks one and seven), therefore, one would expect the speed-up ratio to fall
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