Simulation of dielectric barrier discharge actuator at low Reynolds number

Vaziri, Nima; Chern, Ming‐Jyh; Horng, Tzyy-Leng; Syamsuri, Syamsuri

doi:10.1108/aeat-09-2019-0184

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…The current numerical method has been effectively applied to a range of problems involving thick rigid structures, such as circular cylinders, airfoils, and spherical solid objects, in past studies. [21][22][23][24][25][26]…”

Section: Two-stage Dfib With Prediction-correction Processmentioning

confidence: 99%

“…The subgrid technique can also be used for solid–fluid boundary interface cells (cut cells) to refine the geometry of the solid body and calculate the fraction efficiently. This type of DFIB approach has been developed and used successfully in many studies 20‐26 . This is also referred to as the one‐stage direct‐forcing IB method.…”

Section: Introductionmentioning

confidence: 99%

“…This type of DFIB approach has been developed and used successfully in many studies. [20][21][22][23][24][25][26] This is also referred to as the one-stage direct-forcing IB method. Furthermore, the virtual force term in the one-stage DFIB projection method revises the velocity field near the solid region but not the pressure at the end of each time step.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical modeling of flow past a volumeless and thin rigid body using direct forcing immersed boundary method

Tewolde

Wei

Chern

2022

Numerical Methods in Fluids

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The new capability has been added as the numerical method for modeling volumeless and thin rigid bodies to the direct forcing immersed boundary (DFIB) method. The DFIB approach is based on adding a virtual force to the Navier–Stokes equations of incompressible flow to account for the interaction between the fluid and structures. The volume of a solid function (VOS) identifies the stationary or moving solid structures in a given fluid domain. A new VOS‐based algorithm was developed to identify thin, rigid structure boundary points in fluid flow and ensure that the fluid cannot cross through the boundary of a thin rigid structure while moving or stationary. The DFIB method was first validated in a three‐dimensional (3D) turbulent flow over a circular cylinder. The large‐eddy simulation simulated the turbulent flow scales. The proposed algorithm was tested using a 3D turbulent flow past a stationary and rotating Savonius wind turbine that functions as a thin, rigid body. The validation results showed that the selected DFIB approach, combined with the novel algorithm, could simulate a thin, volumeless, rigid structure that is stationary and rotating in incompressible turbulent flows. The current method is also applicable for two‐way fluid‐structure interaction problems.

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Section: Two-stage Dfib With Prediction-correction Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical modeling of flow past a volumeless and thin rigid body using direct forcing immersed boundary method

Tewolde

Wei

Chern

2022

Numerical Methods in Fluids

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“…Several methods that are often used include numerical simulation methods with CFD and experimental methods. These two methods, both numerical simulation with CFD [17] and experimental methods [18], have their respective advantages. This research was conducted experimentally to determine the impact of changing piston length with the same bore diameter on vehicle performance.…”

Section: Introductionmentioning

confidence: 99%

The impact of compression ratio on performance and exhaust emissions in a 100 cc spark ignition engine for green technology

Syamsuri,

Suheni,

Harimurti

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The compression ratio has a significant role in vehicle performance. The arrangement of air entering and leaving the combustion chamber is determined by the design of the air inlet and outlet locations. The design of the combustion chamber is crucial to prevent backflow in the remaining combustion air. Backpressure is the emission of gases flowing back into the combustion chamber, causing non-stoichiometric combustion. The purpose of this research is to find the effect of compression ratio on performance and exhaust emissions of motorcycles, especially spark ignition engines. The research procedure begins with a standard piston modification process to get compression ratios of 9:1, 10:1, 11:1, and 12:1. In order to get uniform weight, pistons with low compression ratios will be equipped with holes at the bottom. Experimental data taken were; dynamometer, gas analyzer, and SFC. An increase in compression ratio causes an increase in vehicle performance in the form of torque and power. The air-fuel mixture is compressed to a smaller volume, leading to increased density. This increased density promotes better flame propagation and faster combustion. When the combustion process is faster and more efficient, there is less time for unburned hydrocarbons to be released into the exhaust gases.

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Numerical study of the effects of pulsed plasma actuator on physical behavior of the fluid flow around a ducted wind turbine

Mofateh

Ghafouri

Kosarineia

et al. 2022

Int. J. Mod. Phys. C

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As with other types of wind turbines, the ducted wind turbine has a bright future. On the other hand, flow separation has a consistent effect on this type of turbine, resulting in aerodynamic losses and load fluctuations. As a result, flow control systems for ducted wind turbines are critical for improving aerodynamic performance. Additionally, in this technological age, noise pollution has developed into a serious problem that must be minimized and controlled to the greatest extent feasible. This research investigates the impact of a plasma actuator as an active control approach on the flow dynamics on the blades using a finite volume code. To decrease computing costs, the URANS model and mesh adaptive methods are applied. The numerical results are confirmed by comparing them to a previously collected experimental dataset. The flow dynamics and noise emission of a micro dielectric-barrier-discharge plasma actuator were examined under the impact of discontinuous pulsing. This actuator was fitted in three distinct places at the beginning point of separation in the blade without using the ducted wind turbine’s control approach. The results indicated that positioning the actuator near the blades’ tip improves aerodynamic performance. Additionally, when the plasma actuator’s power is raised, the vortex cancellation is maximized. The results indicated that the DBD actuator generated a considerable portion of reverse flow, in this case in the opposite direction to the tip flow. The reverse flow was used to alter the pressure gradient in the tip gap area, thereby eliminating the vortex. Also, using the plasma actuator reduces the ducted wind turbine’s noise output by cutting down on the wake zone and vortices, which are the main sources of noise.

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Simulation of dielectric barrier discharge actuator at low Reynolds number

Cited by 3 publications

References 26 publications

Numerical modeling of flow past a volumeless and thin rigid body using direct forcing immersed boundary method

Numerical modeling of flow past a volumeless and thin rigid body using direct forcing immersed boundary method

The impact of compression ratio on performance and exhaust emissions in a 100 cc spark ignition engine for green technology

Numerical study of the effects of pulsed plasma actuator on physical behavior of the fluid flow around a ducted wind turbine

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