Time- and frequency-domain computations of broadband noise due to interaction between incident turbulence and rectilinear cascade of flat plates

Kim, Dae-Hwan; Cheong, Cheolung

doi:10.1016/j.jsv.2012.05.013

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…However, as the oscillation frequency increases, there are closer agreements between the numerical and the experimental results. To ensure the property of the current numerical scheme and preserve the dispersion relation, which is an important parameter for determining the ability of this numerical scheme to simulate wave-type phenomena, the numerical wave number of the present scheme needs to be analyzed [51][52][53][54][55][56]. The critical wavenumber can be defined as |Im(k numer.c )∆x − k exact ∆x| = 0.005, according to which the critical wavenumber of the present scheme is Im(k numer.c )∆x = π/5.…”

Section: Experimental Setup and Computational Domainmentioning

confidence: 99%

Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows

Cheong

Seol³

et al. 2018

Applied Sciences

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The goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies. The proposed parallel computing techniques are based on the moving body-fitted grids’ overset on background multidomains with grid-overlapping at their interface. First, the cavitation flow over the hemispherical head form is investigated using the two-phase flow solver, which is validated by comparing the numerical and experimental results. Subsequently, the parallel computing technique based on the multidomain method that divides the computational domain into several smaller subdomains is proposed to facilitate more efficient numerical simulations. At the interface of the subdomains, the grid-overlapping method is proposed for more accurate simulations. The illustrative computations indicate that the accuracy of the parallel computation combined with the grid-overlapping method on multidomains is identical to that of the serial computation based on a single block, albeit with a significant reduction in the computation time. Finally, the moving overset grid technique is combined with the background multidomain method and applied to simulate the gust flow that is generated by the pitching motions of the twin hydrofoils. The overset grid technique includes the following three sequential steps: hole-cutting, finding donor cells, and bilinear interpolation. The prediction results for the inflow gust generated by oscillating hydrofoils closely follow the measured results.

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Section: Experimental Setup and Computational Domainmentioning

confidence: 99%

Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows

Cheong

Seol³

et al. 2018

Applied Sciences

Self Cite

View full text Add to dashboard Cite

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“…(1) to suppress the high-frequency spurious waves that cannot be resolved by numerical schemes using finite grid points. The CAA program based on this scheme has been applied and validated over various applications (Kim et al, 2010;Kim and Cheong, 2012;Cheong et al, 2006aCheong et al, , 2008Cheong and Lee, 2001) dealing with tonal or broadband noise generation and propagation. Fig.…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%