Low-Reynolds-number flow around a square cylinder at incidence: study of blockage, onset of vortex shedding and outlet boundary condition

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

doi:10.1002/(sici)1097-0363(19980115)26:1<39::aid-fld623>3.0.co;2-p

Cited by 488 publications

(161 citation statements)

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“…The ratio of velocities above and below the splitter plate is defined as velocity ratio, r. The computational domain length, L and height, H are taken as 32 times and 16 times the square cylinder length respectively, as seen in figure 1. According to Sohankar et al (1998), when using Neumann boundary conditions, a minimum downstream length of 20 times the square cylinder side length is required to isolate the effects of outlet boundary on the flow and wake properties. In the present study a downstream length of dl=25a units was considered for all cases simulated.…”

Section: Introductionmentioning

confidence: 58%

“…It was observed that the flow was steady for Reynolds numbers 50 and 52, see figure 3, and unsteady periodical at Re=55. According to Sohankar et al (1998), Von Karman vortex street appeared and therefore vortex shedding was happening in the wake of the square cylinder at Re=51.2±1. 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.…”

Section: Numerical Strategy and Boundary Conditionsmentioning

confidence: 99%

“…Studies on the problems of wake development and vortex shedding behind a rectangular/square cylinder in free-stream flows was investigated both numerically and experimentally among others by, Franke (1991), Franke et al (1990), Kelkar and Patankar (1992), Davis and Moore (1982), Davis et al (1984), Okajima (1982Okajima ( , 1990, Okajima et al (1992), Mukhopadhyay et al (1992), Suzuki et al (1993) and Sohankar et al (1998Sohankar et al ( , 1999.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 58%

Section: Numerical Strategy and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Mushyam

Bergadà

2016

Meccanica

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“…The initial conditions are obtained from a steady-state solution of the flow and sensitivity equations. Following the work of Sohankar, the time step is set to t = 0.025 [33]. This leads to …”

Section: Verificationmentioning

confidence: 99%

“…This is to be expected as the wake of a circular cylinder at Re = 100 is an unstable flow. Because the critical Reynolds number for this flow is Re cr = 51 [33], in principle a vortex street should develop for constant inflow boundary conditions. Vorticity contours are shown in Figure 6 for t = 94-100 clearly illustrating the Karman vortex street in the wake of the cylinder.…”

Section: Flow Responsementioning

confidence: 99%