Grid convergence study of a cyclone separator using different mesh structures

Oliveira, Ricardo Arbach Fernandes de; Justi, Gabriel Henrique; Lopes, Gabriela Cantarelli

doi:10.2298/ciceq160516044o

Cited by 8 publications

(4 citation statements)

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“…The SIMPLE algorithm is a numerical method mainly used to solve incompressible fluids. Its core is to use the "guess-correction" process to calculate the pressure field on the basis of staggered grids, so as to solve the momentum equation [51]. Combined with the actual natural gas hydrate exploitation project, considering the influence of gravity on the cyclone separation process, the acceleration of gravity was set to 9.81m/s 2 .…”

Section: Numerical Methods and Grid Generationmentioning

confidence: 99%

“…The Ansys's pre-processing software Gambit was used to grid the fluid domain model of hydrocyclone which is applicable to sand removal in solid fluidization exploitation of natural gas hydrate, five levels of grids with 1821724, 2286356, 2799447, 3216424 and 3691497 cells were examined. The static pressure distribution on the monitoring line L MC under different grid levels was analyzed, as shown in Fig 3 . When the grid number reached 2799447, the static pressure on the monitoring line L MC is basically unchanged [51]. In order to ensure the accuracy of numerical simulation and save calculation time, the fluid domain model of hydrocyclone is divided into 2799447 grid elements, and the meshing results is shown in Fig 4.…”

Section: Grid Independencementioning

confidence: 99%

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Analysis of flow field characteristics of sand removal hydrocyclone applicable to solid fluidization exploitation of natural gas hydrate

Wei,

Qiao,

Fan

et al. 2023

PLoS ONE

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With the development of economy and society, the consumption of fossil energy is gradually increasing. In order to solve the current energy dilemma, Natural gas hydrate (NGH) is considered as an ideal alternative energy. At the same time, solid fluidization exploitation is an ideal method. However, in the process of that, sand and hydrate ore bodies enter the closed pipeline together, which will block the pipeline and increase the difficulty of exploitation. Therefore, the pre-separation of sand by hydrocyclone plays an important role in solid fluidization exploitation. In this study, the numerical simulation method was used to study the internal flow field characteristics of the hydrocyclone, and the effects of different flow rate, different flow ratio, different sand content and different particle diameter on the phase distribution were investigated. The results show that: at the same axial position, the increase of flow rate and sand content makes the sand phase more distributed at the edge of the flow field. Under the same working conditions, the sand gradually migrates to the center of the flow field with the increase of the axial distance. By calculation, it is obtained that under the optimum working condition of the flow rate is 4.83m3/h, the flow ratio is 20%, the sand content is 20%, and sand diameter is 80μm, the maximum Es is 22.1% and the minimum is 86.1%. Finally, a comprehensive analysis of the hydrocyclone in this study shows that this hydrocyclone is only applicable to rough pre-separation of sand in the process of solid fluidization exploitation. Through the study of the internal flow field characteristics and phase distribution law of the hydrocyclone, this study provides a reference for the practical engineering application of sand phase pre-separation in the solid fluidization exploitation of NGH.

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Section: Numerical Methods and Grid Generationmentioning

confidence: 99%

Section: Grid Independencementioning

confidence: 99%

Analysis of flow field characteristics of sand removal hydrocyclone applicable to solid fluidization exploitation of natural gas hydrate

Wei,

Qiao,

Fan

et al. 2023

PLoS ONE

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“…Nevertheless, 60,000 nodes number is preferred in this study since the computer memory or computation time is also the determining factor. Luis et al [22] also applied lower element numbers to optimize the both CFD model accuracy and computational effort. However, Chowdhury et al [23] preferred to use highest elements number in their study to achieve the acceptable result though they had mentioned that it was impractical as it takes a lot of computational time.…”

Section: Comparison Between Quadrilateral and Triangular Cell Element...mentioning

confidence: 99%

The analysis of grid independence study in continuous disperse of MQL delivery system

Zulkifli,

N.H. Abdul Halim,

Z.H. Solihin

et al. 2023

JMES

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A sustainable cutting method of Minimum Quantity Lubricant (MQL) was introduced to promote lubrication effect and improve machinability. However, its performances are very dependent on the effectiveness of its mist to penetrate deep into the cutting zone. Optimizing the MQL system requires massive experimental work that increases cost and time. Therefore, this study conducts Computational Fluid Dynamic (CFD) analysis using ANSYS Fluent and focuses on the grid independence study in dispersed-continuous phase of MQL delivery system. The main aim is to identify the best mesh model that influences the accuracy of the CFD model. The analysis proposed two different unstructured grid cell elements of quadrilateral and triangular that were only applicable for 2-dimensional fluid flow in CFD. The unstructured grid was controlled with three different mesh quality factors such as Relevance Center, Smoothing, and Span Angle Center at coarse /low, medium, and fine /high. The results showed that the best mesh quality for quadrilateral was at 60,000 nodes number and coarse mesh, whereas the triangular was at 90,000 nodes number and coarse mesh. Both combinations resulted the most consistent and reliable result when compared with past studies. However, this study decided to choose quadrilateral cell element with 60,000 nodes number and coarse mesh as it is considered to be sufficient to provide accurate and reliable result as well as practical in terms of computational time for the MQL model in CFD analysis.

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“…The grid spacing was distributed non-uniformly. More cells were placed closer to the interior of two regions (interface of porous and non-porous region) to capture the complex flow behavior in this region [22,23]. After performing grid independency check, the final number of cells were 146 404, with a quality (EquiAngle Skew) value of 0.81 for the worst element.…”

Section: Reactor Geometrymentioning

confidence: 99%

CFD modelling of a rectangular photobioreactor used for decolorization of Acid Orange 7 by GOx/TiO2/PU porous catalyst

Zolfaghari

Shoaebargh

Aghbolaghy

et al. 2019

CI&CEQ

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Article Highlights• Rectangular photobioreactor containing a porous catalyst was simulated by CFD • Hydrodynamics of the reactor in porous and non-porous zones were studied • Enzymatic photo-degradation of AO7 dye in an aqueous solution was modeled • The CFD simulation was verified using empirical results Abstract A rectangular bioreactor with a porous catalyst (GOx/TiO 2 /PU) was investigated by computational fluid dynamics (CFD). The bioreactor was used for elimination of Acid Orange 7 (AO7) dye as a model aqueous pollutant. CFD simulation was validated experimentally in a flow rate of 30-60 mL/min and initial dye concentration of 5.7-10.75 mg/L. Hydrodynamics equations were successfully integrated to study the effect of porous media on flow behavior and pressure drop. Hydrodynamics and RTD analyses proved that the implementation of polyurethane foam as a porous carrier leads to higher residence time and increases AO7 elimination rate. Comparison of experimental single-pass AO7 elimination results with those of CFD simulations showed an average error of 7.8%, confirming the efficiency of the proposed CFD model.

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Grid convergence study of a cyclone separator using different mesh structures

Cited by 8 publications

References 0 publications

Analysis of flow field characteristics of sand removal hydrocyclone applicable to solid fluidization exploitation of natural gas hydrate

Analysis of flow field characteristics of sand removal hydrocyclone applicable to solid fluidization exploitation of natural gas hydrate

The analysis of grid independence study in continuous disperse of MQL delivery system

CFD modelling of a rectangular photobioreactor used for decolorization of Acid Orange 7 by GOx/TiO2/PU porous catalyst

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