Numerical simulation of unsteady low-Reynolds number flow around rectangular cylinders at incidence

Sohankar, A.; Norbergb, C.; Davidson, Lars

doi:10.1016/s0167-6105(97)00154-2

Cited by 178 publications

(99 citation statements)

References 21 publications

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“…The resulting Cdmean and St are compared with the experimental data of Okajima 1 and Norberg. 2 Also these values are compared with the numerical results of Sohankar et al 3 and Gera et al 32 (see Table II). It can be observed that our results show good agreement with those of other researchers.…”

Section: B Code Validationmentioning

confidence: 97%

“…Also number of grid points, initial and boundary conditions change the flow behavior around bluff bodies. [1][2][3] Several analytic and numerical studies have been conducted to study the characteristics of Newtonian as well as non-Newtonian fluid flows. [4][5][6] Also numerous experimental and numerical studies have been carried out for the flow past inline circular cylinders; some representative works are those of Zdravkovich, 7 Williamson, 8 Mizushima and Suehiro, 9 Sumner et al, 10 and Lam et al 11 These researchers found that the gap spacing between cylinders play an important role because it strongly affects the flow patterns and also flow induced forces.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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In this work, fluid-solid interactions are numerically investigated for flow around three equally/unequally spaced square cylinders using the lattice Boltzmann method. Two major trends of shear layers observed for equal gap spacings between cylinders: (i) without roll up (W), and (ii) with roll up (R). While for unequal gap spacings, four major trends of shear layers observed: (i) without roll up in both gaps (WW), (ii) without rollup in first gap and with roll up in second gap (WR), (iii) with roll up in first gap and without roll up in second gap (RW), and (iv) with roll up in both gaps (RR). g = 3 is found to be the critical equal spacing value. Also g = 1.5 is found to be suitable equal spacing in terms of minimum drag force. While the suitable unequal gap spacing combinations found in this study are (g1, g2) = (1.5, 0.5), (g1, g2) = (3, 0.5) and (g1, g2) = (5, 0.5). Results show that flow induced forces can be suppressed by suitable unequal gap spacing combinations.

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Section: B Code Validationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of fluid-solid interaction for flow around three square cylinders

et al. 2018

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“…[2,15]. Previous works by the present authors [25,26,27,28] have shown that the RMS lift and drag coefficients are more sensitive than mean values to various numerical and physical parameters. The experimental and numerical results in Table 1 confirm this finding.…”

Section: Resultsmentioning

confidence: 57%

A Dynamic One-Equation Subgrid Model for Simulation of Flow around a Square Cylinder

Esfahani

Davidson

Norberg³

1999

Engineering Turbulence Modelling and Experiments 4

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Large Eddy Simulations (LES) of flow around a square cylinder at ¥ § ¦ § © © are performed employing a dynamic one-equation subgrid model. An implicit fractional step method finite-volume code with second-order accuracy in space and time is used. By using a periodic boundary condition the spanwise dimension is four times the side length of the cylinder. Some global quantities, such as the dominating wake frequency (Strouhal number) and the mean and RMS values of lift and drag, are computed. Also, a series of time-and spanwise-averaged resolved velocities and turbulent stresses are provided for comparison with experiments. The influence of a finer grid on the results is investigated. Present results are in general agreement with experiments and by using a finer spatial resolution an even better agreement is found. The dynamic one-equation subgrid model is found to be stable and no sign of the numerical problems usually encountered with the standard dynamic SGS-model is observed.

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“…Kelkar and Patankar (1992) via flow stability analysis, found that the critical Reynolds number for the onset of vortex shedding was 54, which is in line with the results obtained and presented in figure 3. For unconfined flow past a square cylinder in an unsteady periodic flow regime under the Reynolds number range 100≤Re≤200, average drag coefficients and Strouhal numbers were compared with the results presented by Franke et al (1990) and Sohankar et al (1997;1998;. In all cases identical flow and boundary conditions were used.…”

Section: Numerical Strategy and Boundary Conditionsmentioning

confidence: 99%

A numerical investigation of wake and mixing layer interactions of flow past a square cylinder

Mushyam

Bergadà

2016

Meccanica

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Meccanica.La publicació final està disponible a Springer a través de http://dx.doi.org/10.1007/s11012-016-0400-8 This is a copy of the author 's final draft version of an article published in the journal Meccanica. Abstract:The aim of the present study is to simulate and analyze the interaction of two dimensional flow past a square cylinder in a laminar regime with an upstream mixing layer developed by an axis symmetrical horizontal splitter plate. The mixing layer is generated upstream of the square cylinder by mixing two uniform streams of fluid with different velocities above and below the splitter plate. A range of upstream domain lengths, distances between the splitter plate and the square cylinder, and upstream velocity ratios between the two streams of fluid are analyzed. Unconfined flow over a square cylinder placed in uniform upstream flow is initially analyzed as it plays a crucial role in understanding the properties of the wake. The results are compared with the existing literature to validate the code developed and they are found to be in very good agreement. It is observed from the present study that at smaller velocity ratios, the vortices shed into the wake consist of both clockwise and anticlockwise moment vortices. As velocity ratio is increased only clockwise moment vortices are shed downstream and anticlockwise vortices are shed as Kelvin-Helmholtz instabilities. In all simulations undertaken the same phenomena is observed independent of the upstream Reynolds number, indicating that velocity ratio is a primary parameter influencing the flow. Different instability modes were observed and they were highly dependent on the upstream velocity ratio.

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Numerical simulation of unsteady low-Reynolds number flow around rectangular cylinders at incidence

Cited by 178 publications

References 21 publications

Numerical investigation of fluid-solid interaction for flow around three square cylinders

Numerical investigation of fluid-solid interaction for flow around three square cylinders

A Dynamic One-Equation Subgrid Model for Simulation of Flow around a Square Cylinder

A numerical investigation of wake and mixing layer interactions of flow past a square cylinder

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