Control over Vortex Shedding and Drag Force on a Circular Obstacle Using a Pair of Downstream Splitter Plates in a Transient Flow

Ain, Qurrat Ul; Rasheed, Muhammad Waheed; Abbasi, Waqas Sarwar

doi:10.1155/2023/6142773

Cited by 2 publications

(1 citation statement)

References 34 publications

(43 reference statements)

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“…Further in a study carried out by Soumyaet al [14] found that the variation of drag, lift are not monotonic with increasing plate length.Passive control of vortex shedding behind a square cylinder at incidence has been conducted by Sarıoğlu M [15] experimentally by using a stationary splitter plate for the Reynolds numbers of 3.0×10 4 . An analysis of the laminar, twodimensional, and transient flow over a circular cylinder with a two-branched splitter plate by Ain QU et al [16] determined that the best conditions using geometrical characteristics. The widthalthough there have been several investigations [17] [18] on drag reduction around bluff bodies using splitter plates, most of these studies [19] [20] focused either on wind tunnel studies or computational studies [21] [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of plate length on drag reduction of square faced bluff body

Natarajan,

Sambath,

K B

et al. 2024

E3S Web of Conf.

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This study investigates the impact of splitter plates on drag reduction in square-faced bodies using a water flow channel with three different splitter plate lengths: 2.5 cm, 1.8 cm, and 1.25 cm. The height and thickness were kept constant at 2.5 cm and 3 mm. Reynolds numbers ranging from 8977.5 to 3847.5 were tested. Results showed that increasing the Reynolds number increased the pressure hill height for both splitter plates forward as well backward. In the first case the forward splitter plate, shorter lengths resulted in reduced pressure hill heights. For the backward splitter plate, longer lengths led to larger pressure hill heights. The best drag reduction effect is got when the splitter plate length and the model length are of equal length. Overall, the effective drag reduction effect is shown by the backward splitter plate compared to the forward, the difference in value is almost 30%. These results are eminent for getting a perception of relation that exist between splitter plate length and drag reduction in square-faced bodies.

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Section: Introductionmentioning

confidence: 99%

Effect of plate length on drag reduction of square faced bluff body

Natarajan,

Sambath,

K B

et al. 2024

E3S Web of Conf.

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Predicting the passive control of fluid forces over circular cylinder in a time dependent flow using neuro-computing

Asghar,

Mahmood,

Majeed

et al. 2024

AIP Advances

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The objective of this research is to combine Artificial Neural Networks (ANNs) and Computational Fluid Dynamics (CFD) approaches to leverage the advantages of both methods. To achieve this goal, we introduce a new artificial neural network architecture designed specifically for predicting fluid forces within the CFD framework, aiming to reduce computational costs. Initially, time-dependent simulations around a rigid cylinder and a passive device (attached and detached) were conducted, followed by a thorough analysis of the hydrodynamic drag and lift forces encountered by the cylinder and passive device with various length L=0.1,0.2,0.3 and gap spacing Gi=0.1,0.2,0.3. The inhibition of vortex shedding is noted for gap separations of 0.1 and 0.2. However, a splitter plate of insufficient length or placed at an unsuitable distance from an obstacle yields no significant benefits. The finite element method is employed as a computational technique to address complex nonlinear governing equations. The nonlinear partial differential equations are spatially discretized with the finite element method, while temporal derivatives are addressed using a backward implicit Euler scheme. Velocity and pressure plots are provided to illustrate the physical aspects of the problem. The results indicate that the introduction of a splitter plate has reduced vortex shedding, leading to a steady flow regime, as evidenced by the stable drag and lift coefficients. The data obtained from simulations were utilized to train a neural network architecture based on the feed-forward backpropagation algorithm of Levenberg–Marquardt. Following training and validation stages, predictions for drag and lift coefficients were made without the need for additional CFD simulations. These results show that the mean square error values are very close to zero, indicating a strong correlation between the fluid force coefficients obtained from CFD and those predicted by the ANN. Additionally, a significant reduction in computational time was achieved without sacrificing the accuracy of the drag and lift coefficient predictions.

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Control over Vortex Shedding and Drag Force on a Circular Obstacle Using a Pair of Downstream Splitter Plates in a Transient Flow

Cited by 2 publications

References 34 publications

Effect of plate length on drag reduction of square faced bluff body

Effect of plate length on drag reduction of square faced bluff body

Predicting the passive control of fluid forces over circular cylinder in a time dependent flow using neuro-computing

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