Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Reda, E.; Zulkifli, Rozli; Harun, Zambri

doi:10.15282/jmes.11.2.2017.9.0243

Cited by 7 publications

(8 citation statements)

References 37 publications

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“…One of the disadvantages of this energy is an intermittent resource, but the availability depends on some conditions like wind velocity, wind speed distribution and fluctuation intensities [2]. Particularly, the turbulent flow of wind speed in urban areas was investigated by Reda et al [3]. in the wind tunnel model.…”

Section: Introductionmentioning

confidence: 99%

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Puspitasari¹,

Sahim²

2019

JMES

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A vertical hybrid turbine commonly consists of a Darrieus and Savonius rotor where the Savonius is inside Darrieus turbine. This paper describes the experimental study of hybrid Darrieus-Savonius wind turbines by variation in Savonius blade height. In this case, the effect of the blade height of the Savonius blade was studied experimentally in a subsonic wind tunnel. The effect of the height of a Savonius blade relative to that of Darrieus called blade height ratios δ was investigated to know the hybrid turbine performance. The performance is represented by power and torque coefficient. The result shows that the hybrid turbine with height ratio greater than unity δ = 1.4 gives the highest power CP = 0.20 and torque coefficient CT = 0.129. It is investigated that the torque and the power coefficient have a higher value than that of Darrieus turbine, in which the increase in power and torque coefficient are 48% and 29%, respectively. This hybrid wind turbine with a blade height ratio greater than unity can be considered as an important variable in the wind turbine construction.

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Section: Introductionmentioning

confidence: 99%

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Puspitasari¹,

Sahim²

2019

JMES

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“…During the process of designing and testing each of the combustors, there will be a very high expenditure of cost and time, and mistakes are not allowed in this process. Therefore, presently Computational Fluid Dynamics (CFD) is one choice being used to design can combustors [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of various inlet geometries on swirling flow in can combustor

Treedet¹,

Suntivarakorn²

2018

J. MECH. ENG. SCI.

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This paper presents the effects of various inlet geometries on swirling flow and a study of the flow behavior of air in the can combustor using a CFD model. In this work, the standard k-ɛ turbulence model was used. Furthermore, for this study, the can combustor had an inner diameter, outer diameter, and length of 250 mm, 290 mm, and 406 mm, respectively. An annular swirler was used in order to generate a re-circulating velocity in the chamber of combustor. Various inlet geometries were designed and experiments were conducted to study the effects of these designs on the swirling flow inside the combustor. To understand the flow behavior, the snout angles varied at 30°, 45°, and 60° angles, and the hub to tip ratio of the vane swirler varied at 0.33 and 0.67. The results showed that the following had an influence upon the Central Re-circulating Zone (CRZ) and Pressure Loss factor (PLF) in a combustor: 1) the snout angle, 2) the hub to tip ratio of the annular swirler, and 3) the auxiliary primary holes. It was also found that the optimum design of this can combustor had a snout angle of 30 degrees and a hub to tip ratio of the swirler of 0.33. In order to create the optimum design for a large CRZ and lowest PLF, it was found that auxiliary primary holes should be also used.

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“…If the modeling is intended to design the equipment for process optimization, then the RANSbased turbulence models are the choice. Meanwhile, if the accuracy of the modeling results is prioritized, the LES turbulence model is the choice [14]. In this study, where the design process becomes the goal, the LES turbulence model is excluded.…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…Each set of turbulent models for k- or k-ω models, has 6 conservation equations to be solved simultaneously. Equations (9) - (14) are set for k- models and equations (9) - (13) and (15) are set for k-ω model [21].…”

Section: Eddy Viscosity Turbulence Modelsmentioning

confidence: 99%

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Three dimensional cyclonic turbulent flow structures at various geometries, inlet-outlet orientations and operating conditions

Pasymi

Budhi

Irawan

et al. 2018

JMES

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Flow structure inside a chamber greatly determines the process performances. Therefore, the flow structure inside a chamber are often constructed in such a way as an effort to obtain equipment performances in accordance with the expectations. This study explored flow structure inside several chamber geometries and operating conditions. Three types of chamber, namely; GTC, DTC and TJC were set as the investigated chambers. The Computational Fluid Dynamics technique, supported by some experimental data from the literature, is used as an investigation method. The RANS based models, under Ansys-Fluent software were used in this numerical investigation. Simulation results revealed that the flow structures of GTC and DTC are predominantly created by spiral and vortex patterns. The vortex stabilizer diameter in the GTC affects the vortex pattern, velocity profile and pressure drop. The flow structure of DTC presents the most complex behavior. The flow structure inside TJC, in the case of unconfined outlet boundary, is characterized by the helical and wavy jet pattern. This structure is determined by the initial tangential intensity (IIT) and the inlet aspect ratio (RIA). The structures of vortex, helical, and wavy axial flow are properly constructed and visualized in this paper. There is no a turbulence model which is always superior to the other models, consistently. The standard k-ε model exhibits the realistic and robust performances among all of investigatied cases.

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Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Cited by 7 publications

References 37 publications

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Effect of various inlet geometries on swirling flow in can combustor

Three dimensional cyclonic turbulent flow structures at various geometries, inlet-outlet orientations and operating conditions

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