An improved orthogonal grid generation method for solving flows past highly cambered aerofoils with and without roughness elements

Bagade, P. M.; Bhumkar, Yogesh G.; Sengupta, Tapan K.

doi:10.1016/j.compfluid.2014.07.031

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…The grid orthogonality and smoothness are key factors in high-quality grid generation techniques. A number of studies in the literature have investigated the impacts of orthogonality of the grids on the predicted results and solution accuracy for a wide range of diverse CFD applications (e.g., [28][29][30][31][32][33][34]). Matsuno [2] developed a new orthogonal hyperbolic grid technique based on a high-order upwind approach and showed that the orthogonality and robustness of the generated grids result in highly accurate flow solutions.…”

Section: Introductionmentioning

confidence: 99%

“…The error analysis showed that the truncation error of first-and second-order derivative terms are reduced for orthogonal grids. Besides, it was shown by Bagade et al [29] that the performance and accuracy of transient flow simulations strongly depend on the orthogonality of the grid. Bagade et al [29] further performed a grid sensitivity analysis to demonstrate that the grid characteristics and properties are effective parameters in high accuracy flow computations.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, it was shown by Bagade et al [29] that the performance and accuracy of transient flow simulations strongly depend on the orthogonality of the grid. Bagade et al [29] further performed a grid sensitivity analysis to demonstrate that the grid characteristics and properties are effective parameters in high accuracy flow computations. Finally, in a comprehensive computational study, Akcelik et al [30] investigated the effects of boundary type, grid quality control function, and grid properties on their proposed orthogonal grid generation methodology.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Grid Accuracy on Flow Simulations: A Numerical Assessment

Allahyari

Esfahanian

Yousefi

2020

Fluids

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High-quality, accurate grid generation is a critical challenge in the computational simulation of fluid flows around complex geometries. In particular, the accuracy of the grids is an effective factor in order to achieve a successful numerical simulation. In the current study, we present a series of systematic numerical simulations for fluid flows around a NACA 0012 airfoil using different computational grid generation techniques, including the standard second-order, fourth-order compact, and Theodorsen transformation approaches, to assess the effects of grid accuracy on the flow solutions. The flow solvers are based on the second- and fourth-order schemes for spatial discretizations and Beam-Warming linearization method for time advancement. The obtained grids, as well as the metrics and the corresponding numerical flow solution for each grid generation technique, are compared and studied in detail. It is demonstrated that the quality and orthogonality of the grids is improved by using the fourth-order compact scheme. Moreover, the numerical assessment showed that the accuracy and the quality of the grids directly influence the numerical flow solutions. Finally, the higher-order accurate flow solvers are found to be more sensitive to the accuracy of the generated grid.

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