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A Test Problem for Flow Codes

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arXiv:2404.16798v1 Announce Type: cross
Abstract: We propose a test problem for Navier-Stokes solvers based on the flow around a cylinder. We choose a range of Reynolds numbers for which the flow is time-dependent but can be characterized as essentially two-dimensional. The test problem requires accurate resolution of chaotic dynamics over a long time interval. It also requires the use of a relatively large computational domain, part of which is curved, and it requires evaluation of derivatives of the solution and pressure on the curved boundary. We review the performance of different finite element methods for the proposed range of Reynolds numbers. These tests indicate that some of the most established methods do not capture the correct behavior.

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