A Contribution to the Coanda Effects

概要

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Digital simulation of a discontinuous diffusing flow with particular reference to the Coanda effects is carried out. We give an initial flow pattern arbitrarily and modify it step by step so that it satisfies the Navier-Stokes equations of motion. Reynolds number is assumed to be low enough to keep the flow within the laminar region. A symmetrical initial pattern results in a symmetrical solution anyway in all cases but it is supposedly an unstable flow pattern for Reynolds numbers higher than a critical value. We suppose so because: (1) an unsymmetrical initial pattern results in an unsymmetrical solution is deformed by a small disturbance imposed and eventually settles in the above mentioned unsymmetrical pattern, only for a Reynolds number higher than the critical value. It may thus be said that the Coanda effects occur also in the laminar region and, when they occur, solution of the Navier-Stokes equations is not unique.
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