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Influence from numerical noise in the objective function for flow design optimisation. (English) Zbl 1012.76023

From the summary: The overall pressure drop in an axisymmetric contraction is minimised using two different grid sizes. We parametrize the transition region with only two design variables to creaste surface plots of objective function in design space, which is based on 121 calculations for each grid. The coarse grid has significant numerical noise in the objective function while the finer grid has less numerical noise. The optimisation is performed with two methods, a response surface model, and a gradient method (the method of feasible directions) to study the influence of numerical noise.

MSC:

76D55 Flow control and optimization for incompressible viscous fluids
76M20 Finite difference methods applied to problems in fluid mechanics
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References:

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