On the controversy regarding the effect of flow shear on the Strouhal number of cylinder vortex shedding

Gennaro, Elmer M.; Colaciti, Alysson K.; Medeiros, Marcello Augusto Faraco de

doi:10.1016/j.ast.2013.04.002

Cited by 11 publications

(1 citation statement)

References 30 publications

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“…In this section a code test procedure based on linear stability theory is presented. A very accurate 6th order in house code [7,8] was used as an example to indicate how accurate the numerical solution can be. Moreover, as will be seen, the complete access to the source code permits the implementation of source terms in the flow equations which enable a more accurate comparison between the numerical and the theoretical solutions.…”

Section: Code Test Based On Linear Stability Theorymentioning

confidence: 99%

Verification of commercial CFD codes using hydrodynamic instability

Reis¹,

Gennaro²,

Simões³

et al. 2014

Proceedings of 10th World Congress on Computational Mechanics

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Code verification is an essential process in computational analysis. The lack of access to the source code in commercial softwares often makes this process very difficult to be performed. Usually, the use of manufactured solutions is not feasible and analytical solutions of the Navier Stokes Equations are not sufficient because normally many terms of the equations are null. The situation is more troublesome for unsteady flows since it is more difficult to find analytical solutions and errors can accumulate in time. Simulations focused on turbulent fluctuations or sound wave generation associated with aeroacoustics applications are even more important and difficult to perform, because even minute errors can have a large impact on the flow. Here it is proposed a code verification method based on the simulation of a mixing layer, a canonical flow that transitions to turbulence. This flow is linearly unstable and the stability calculation affords a semi analytical solution. The paper shows how this solution can be used for classification of code performance. In the study, several commercial codes have been tested and very different code performances were obtained, both in terms of accuracy and grid requirements.

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Section: Code Test Based On Linear Stability Theorymentioning

confidence: 99%