An algebraic closure model for the DNS of turbulent drag reduction by Brownian microfiber additives in a channel flow

Moosaie, Amin; Shekouhi, Niloufar; Nouri, Mahtab; Manhart, Michael

doi:10.1016/j.jnnfm.2015.10.005

Cited by 22 publications

(7 citation statements)

References 29 publications

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“…In recent years, a variety of advanced computational methods, e.g., finite element, Newton's method, numerical linear algebra, statistics, numerical analysis, discrete Fourier transform, tensor analysis, and artificial intelligence, have been used in different research fields such as material engineering [24][25][26][27][28][29][30][31], chemical engineering [32][33][34][35][36][37], electrical engineering [38][39][40][41][42][43][44][45][46], medical and biomedical sciences [47][48][49][50][51][52], civil engineering [53][54][55][56], economic science [57][58][59][60][61][62][63][64][65][66][67][68], fluid mechanic engineering [69][70]…”

Section: Radial Basis Function (Rbf) Neural Networkmentioning

confidence: 99%

Proposing an Intelligent Dual-Energy Radiation-Based System for Metering Scale Layer Thickness in Oil Pipelines Containing an Annular Regime of Three-Phase Flow

et al. 2021

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Deposition of scale layers inside pipelines leads to many problems, e.g., reducing the internal diameter of pipelines, damage to drilling equipment because of corrosion, increasing energy consumption because of decreased efficiency of equipment, and shortened life, etc., in the petroleum industry. Gamma attenuation could be implemented as a non-invasive approach suitable for determining the mineral scale layer. In this paper, an intelligent system for metering the scale layer thickness independently of each phase’s volume fraction in an annular three-phase flow is presented. The approach is based on the use of a combination of an RBF neural network and a dual-energy radiation detection system. Photo peaks of 241Am and 133Ba registered in the two transmitted detectors, and scale-layer thickness of the pipe were considered as the network’s input and output, respectively. The architecture of the presented network was optimized using a trial-and-error method. The regression diagrams for the testing set were plotted, which demonstrate the precision of the system as well as correction. The MAE and RMSE of the presented system were 0.07 and 0.09, respectively. This novel metering system in three-phase flows could be a promising and practical tool in the oil, chemical, and petrochemical industries.

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Section: Radial Basis Function (Rbf) Neural Networkmentioning

confidence: 99%

Proposing an Intelligent Dual-Energy Radiation-Based System for Metering Scale Layer Thickness in Oil Pipelines Containing an Annular Regime of Three-Phase Flow

et al. 2021

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“…This results in a dramatic increase in the frictional drag exerted on the wall as compared to the laminar flow. Thus, the attempt to reduce frictional drag in turbulent wall flows is of practical importance [11]. The Shear Stress Transport model of Menter (SST) changes between − and − models.…”

Section: Turbulence Model −mentioning

confidence: 99%

Comparing the Influence of Synthetic jets on Cooling the Angled Plates Versus Vertical and Horizontal Plates

Nabavi

Jafari

2021

MJMIE

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Synthetic jets besides being used in heat transfer, have also been used to control turbulence and flow separation. In the previous decade, research on the applications of a synthetic jet has indicated that by using these types of jets, flow separation can be reduced or even stopped altogether. In addition, these jets have been utilized in unmanned aerial vehicles (UAVs) (to control separation on airfoils) and flight control. In this study, the jet is located perpendicular to the flat plane with fixed heat flux and the effect of some geometric parameters including the ratio of the distance between the jet and the impact plane to the nozzle width, the ratio of the impact plane length to the jet nozzle width, the ratio of synthetic jet width to width of the nozzle, the ratio of the hole height to the nozzle width, the angle of the impact plate as well as the diaphragm characteristics such as amplitude and frequency of the jet diaphragm in heat transfer were evaluated numerically by using OpenFOAM open-source software. The findings indicate that synthetic jets have very weak efficiency for cooling vertical panels. However, they are extremely effective on angled plates. Synthetic jets have more influence on angled planes than horizontal planes.

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“…hnnnni quad = hnnihnni; (24) with ij and a ij being the Kronecker delta and the Cartesian components of hnni, respectively; e i is the Cartesian basis vectors. Eq.…”

Section: Closure Modelsmentioning

confidence: 99%

“…This model, called VA (Viscous Anisotropic), revisited by Moosaie and Manhart [23] and extended to VAF (Viscous Anisotropic with velocity Fluctuations), was applied to ful ll more physical constraints and produce more realistic results. Recently, Moosaie et al [24] have extended the VAF model to take the rotary Brownian motion of particles into account. He used the algebraic model of [23] to directly simulate the ber-induced turbulent drag reduction in a pressure-driven rodroughened channel ow [25].…”

Section: Introductionmentioning

confidence: 99%

On the orientation dynamics and viscoelasticity of Brownian rigid disklike particles suspended in a shear flow

Moosaie

2017

Scientia Iranica

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Abstract. In this paper, numerical simulations are employed to study the orientation behavior of a dilute suspension of Brownian rigid disklike particles in a simple shear ow. Also, the viscoelasticity of such a suspension is analyzed by considering the stress budget of the two-phase material. A direct Monte-Carlo simulator as well as the moment approximation approaches with two di erent closure models are used to produce the data. Results are compared by available experimental and analytical data, and a very good agreement is established. After the validation of the simulators, the results are presented and discussed. Di erent P eclet numbers and shape factors of particles are considered and their e ects on various quantities are presented, e.g. particle orientations in space, viscous and elastic contributions to the non-Newtonian stress tensor, etc.

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An algebraic closure model for the DNS of turbulent drag reduction by Brownian microfiber additives in a channel flow

Cited by 22 publications

References 29 publications

Proposing an Intelligent Dual-Energy Radiation-Based System for Metering Scale Layer Thickness in Oil Pipelines Containing an Annular Regime of Three-Phase Flow

Proposing an Intelligent Dual-Energy Radiation-Based System for Metering Scale Layer Thickness in Oil Pipelines Containing an Annular Regime of Three-Phase Flow

Comparing the Influence of Synthetic jets on Cooling the Angled Plates Versus Vertical and Horizontal Plates

On the orientation dynamics and viscoelasticity of Brownian rigid disklike particles suspended in a shear flow

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