Abstract
Numerical simulations for every flow, need enormous computing time during iterations. In order to solve this problem several techniques have been proposed, for example, a multigrid technique. A method using qualitative reasoning is one such technique. Qualitative reasoning regards two situations, which are different quantitatively but same qualitatively. as the same. Thus it produces a discrete expression for a physical phenomenon. To compensate this discreteness fuzzy logic can be introduced into the reasoning. We studied the possibility of computational acceleration with fuzzy logic and qualitative reasoning in numerical simulations. Some rules were constructed and applied to incompressible backward-facing and forward-facing step flows. It was found that our procedure can realize a considerable acceleration.
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