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In this study, we have developed a numerical model based on an open source Computational Fluid Dynamics (CFD) package OpenFOAM, in order to investigate the flow pattern and pollutant dispersion in urban street canyons with different geometry configurations. In the new model, the pollutant transport driven by airflow is modeled by the scalar transport equation coupling with the momentum ...
Get PriceThe energy consumption of fast-growing data centers is drawing attentions from not only energy organizations and institutions all over the world, but also charity groups, such as Greenpeace, and research shows that the power consumption of air conditioning makes up a large proportion of the electricity cost in data centers. Therefore, more detailed investigations of air conditioning power ...
Get Price2018-8-15 · Style: Copy to clipboard: Format: Tips on citation download ... Numerical simulation of airflow characteristics in the spinning zone at starting time of air-jet spinning machine. ... The effect of different nozzle configurations on airflow behaviour and yarn …
Get Price2018-8-15 · A fiber bundle sucked into the yarn duct rotates, owing to the action of the swirl airflow, and twists the fiber bundle in the processing duct, hence generating a source of yarn. The fiber suction force takes a distribution with a peak against the supplied air pressure and …
Get Price2018-6-1 · Both small- and full-scale experiments, numerical simulations and analytical methods have been used to investigate single-sided buoyancy-driven natural ventilation. Detailed airflow characteristics and ventilation rates were quantified and discussed [9] , [10] , [11] , and the impact due to window configurations, building thermal mass and ...
Get Price2017-2-1 · The behavior characteristics of respirable dust are systematically analyzed at different spaces based on airflow streamline, airflow vector, and dust trace. According to the simulation result, a system for respirable dust control at FMCF is proposed and applied to the field engineering project. 2. Method2.1. Mathematical model of airflow
Get Price2016-11-16 · In order to regulate turbulence strength and determine airflow characteristics in a new dual-feed rotor spinning unit, the internal flow field is investigated. A computational fluid dynamics techni...
Get PriceThe efficiency of tunnels systems is often evaluated using numerical simulations. This concerns both to normal and emergency mode of tunnel systems operation. Therefore the safety level of tunnel users may depend on the quality of numerical models being built. The most often studied areas cover the researches on natural and forced airflows in the normal mode and on fire development and smoke ...
Get Price1996-1-1 · The flow behavior of an air sparging pilot test was simulated using a finite difference, multiphase flow simulator (TETRAD). The field test is one of the only examples where the airflow pattern in the saturated zone is well known.
Get PriceDownload Citation | Numerical Simulation on Flow Field of Laval-style Atomizer by Fluent | Gas atomization can be used in producing high-quality metal powder and the atomizer has great influence ...
Get Price2016-11-16 · In order to regulate turbulence strength and determine airflow characteristics in a new dual-feed rotor spinning unit, the internal flow field is investigated. A computational fluid dynamics techni...
Get Price1996-1-1 · The flow behavior of an air sparging pilot test was simulated using a finite difference, multiphase flow simulator (TETRAD). The field test is one of the only examples where the airflow pattern in the saturated zone is well known.
Get PriceNumerical Study on Aeroacoustics Behaviour of Contra-Rotating Fans International Journal of Engineering Trends and Technology, 69 (8),109-116. The contra-rotating fan produces noise that can affect human health. Therefore, it is important to reduce the noise that is generated by the contra-rotating fan. In this research, the airflow performance ...
Get Price2009-3-19 · The results of numerical simulations of air and particle transport through symmetrically branching airways are summarized. These results shed light upon differences in simulated flow and particle transport behavior for (1) steady versus unsteady flow patterns, (2) two- versus three-dimensional geometries, and (3) natural versus forced user-defined entrance and exit boundary conditions.
Get PriceDownload Citation | Numerical Simulation on Flow Field of Laval-style Atomizer by Fluent | Gas atomization can be used in producing high-quality metal powder and the atomizer has great influence ...
Get Price2020-10-6 · The inhaled air may carry many toxic particles or pharmaceutical aerosols to the human respiratory system in addition to oxygen. During inhalation, the fresh air inhaled through the mouth or the nose is transported to the distal zones of the lungs (i.e., the acinar region), while the waste air leaves the body by following the same path during exhalation.
Get Price2021-5-1 · Numerical simulation of snowdrift on a membrane roof and the mechanical performance under snow loads Cold Reg. Sci. Technol. , 150 ( 2018 ) , pp. 15 - 24 Article Download PDF CrossRef View Record in Scopus Google Scholar
Get Price[2] Saiied M Aminossadati (2008) used CFD modelling to simulate the airflow behaviour in underground cross-cut regions using Brattice sails. His paper presents the results of a two-
Get Price2021-5-1 · Air fluid flow is commonly used in turbulence models, such as the Standard k-ε model, RNG k-ε model, and realizable k-ε model, to simulate airflow (Chen et al., 2010).Three models for PM 2.5 diffusion caused by human walking were simulated and compared with the experimental data.. In the simulation process, the following assumptions are made for the model: the airflow indoors is an ...
Get PriceIn tropical and subtropical countries such as Brazil, temperatures inside agricultural facilities reach values greater than those considered suitable for thermal comfort for both animals and people. To predict the behavior and distribution of temperature in all directions of the structure and make correct decisions about the inside environment, the classic research method would require a ...
Get PriceThe flow behavior of an air sparging pilot test was simulated using a finite difference, multiphase flow simulator (TETRAD). The field test is one of the only examples where the airflow pattern in the saturated zone is well known.
Get PriceDownload Citation | Numerical Simulation on Flow Field of Laval-style Atomizer by Fluent | Gas atomization can be used in producing high-quality metal powder and the atomizer has great influence ...
Get Price2009-3-19 · The results of numerical simulations of air and particle transport through symmetrically branching airways are summarized. These results shed light upon differences in simulated flow and particle transport behavior for (1) steady versus unsteady flow patterns, (2) two- versus three-dimensional geometries, and (3) natural versus forced user-defined entrance and exit boundary conditions.
Get Price2021-5-1 · Numerical simulation of snowdrift on a membrane roof and the mechanical performance under snow loads Cold Reg. Sci. Technol. , 150 ( 2018 ) , pp. 15 - 24 Article Download PDF CrossRef View Record in Scopus Google Scholar
Get Price2016-10-10 · Labbé [10] carried out large eddy simulations in a ribbed channel with a blockage ratio of 30%. According to the channel height and the bulk velocity the Reynolds number was 40000. All simulations reproduced the major flow structures measured experimentally. The …
Get Price[2] Saiied M Aminossadati (2008) used CFD modelling to simulate the airflow behaviour in underground cross-cut regions using Brattice sails. His paper presents the results of a two-
Get PriceIn the CFD simulation, the continuity equation, momentum equations and energy equation [7][8] [9] were considered to model the motion of airflow passing through the heat sink. The airflow was ...
Get PriceThe velocity profiles in the inspiratory and expiratory phases (Figures 4 and 6) are generally consistent with those obtained in the study by Hahn et al 6 and in the numerical simulation by Keyhani et al. 13 Using numerical simulation, Elad 11 and Keyhani 13 and their colleagues determined that the primary route of airflow …
Get PriceKenji Ono. Gander and Petcu (ESAIM Proc 25:114–129, 2008) reported that, theoretically, the convergence of the parareal method iteration for hyperbolic PDEs is strongly influenced by the phase ...
Get Price2019-12-21 · 3.2 Numerical simulation 3.2.1 Results from computational fluid dynamics. Figure 8 shows the horizontal distribution of airflow (1.5 m from the ground) at 12:00 in the selected city block. In “Area A,” the separated flow around the corner of middle‐rise …
Get PriceThe present paper reports the mean flow field behavior of an isothermal turbulent impinging jet in a room. The detailed experimental study is carried out to validate the numerical simulations, and the predictions are performed by means of the RNG k-ε and SST k-ω model. The comparisons between the predictive results and the experimental data ...
Get Price(2017) Jaafar et al. Procedia Engineering. The air conditioning applications in mosques are considered as one of the important HVAC applications, which indoor air quality depend on the behavior of the airflow, the distributions of temperatures and relative humidity and concentration of carbon dio...
Get Price2016-10-10 · Labbé [10] carried out large eddy simulations in a ribbed channel with a blockage ratio of 30%. According to the channel height and the bulk velocity the Reynolds number was 40000. All simulations reproduced the major flow structures measured experimentally. The found that the secondary cross-
Get Price2020-11-24 · R. Perić and M. Perić, “ Analytical and numerical investigation of the airflow in face masks used for protection against COVID-19 virus–implications for …
Get Price2005-6-7 · 2002 (English) In: Proceedings of Roomvent 2002: the 8th International Conference on Air Distribution in Rooms, 2002, p. 197-200 Conference paper, Published paper (Refereed) Place, publisher, year, edition, pages 2002. p. 197-200 Keywords [en] CFD, particles, particle concentrations, numerical simulations
Get Price2017-2-6 · Many insects are well adapted to long-distance migration despite the larger energetic costs of flight for small body sizes. To optimize wing design for next-generation flying micro-robots, we analyse butterfly wing shapes and wing orientations at full scale using numerical simulations …
Get PriceThe velocity profiles in the inspiratory and expiratory phases (Figures 4 and 6) are generally consistent with those obtained in the study by Hahn et al 6 and in the numerical simulation by Keyhani et al. 13 Using numerical simulation, Elad 11 and Keyhani 13 and their colleagues determined that the primary route of airflow …
Get PriceAt present, Computational-Fluid-Dynamics (CFD) with the ‘standard’ k-ɛ model is a popular method for numerical simulation of room airflow. The k-ɛ model needs a lot of computing time and ...
Get PriceThe complex fluid dynamics associated with the flow in three-dimensional dichotomously branching networks is investigated. The flow physics described here is generic, though the particular flow geometry employed represents a model human bronchial tree. Up to six generations of branches (involving 63 straight portions and 31 bifurcation modules) are computed in one go; such computational ...
Get Price2010-7-27 · A critical review is presented of the available experimental data on regional aerosol deposition in man. The data agree well for nasal and extrathoracic deposition. For the fast and slow cleared components of thoracic deposition, however, agreement is less satisfactory. The different experimental techniques are critically evaluated, and ...
Get Price2016-10-10 · Labbé [10] carried out large eddy simulations in a ribbed channel with a blockage ratio of 30%. According to the channel height and the bulk velocity the Reynolds number was 40000. All simulations reproduced the major flow structures measured experimentally. The found that the secondary cross-
Get Price2020-10-13 · The flow behavior is studied and a comparison of results from the simulations and the experimental wind tunnel data is presented. The ability of Computational Fluid Dy-namics (CFD) techniques in simulating wind flow over entire wind turbine assembly is also displayed by carrying out moving mesh simulations of a full wind turbine. v
Get PriceCFD or computational fluid dynamics is the analysis of the Fluid flow of liquids and gases in and around specifically designed objects under study. It also involves the numerical modeling and CFD simul ation of thermal behaviors via CFD Thermal analysis. The …
Get PriceThe combined TAGUCHI method and numerical simulations was used to optimize the characteristic parameters of the cooperative injection and suction jet that affect the power extraction characteristics of the S-AFA. Under the Reynolds number of 6×104 and the pitching axis location at the center of the ellipse airfoil, the effects of the je...
Get Price2010-12-1 · The maximum difference was 10.4% for SPECT/CT data in the left lower lobe, 7.8% for CT data in the right lower lobe; and 11.2% for CFD data in the right lower lobe. An overview of the differences in lobar distribution for all methods can be found in Table 3. Table 3 Range of …
Get Price2020-7-31 · Multibody dynamics analysis (MDA) is one of these techniques and although it originated as a tool used in the engineering and automotive industry, it holds great potential to address palaeontological questions as well. MDA allows the simulation of dynamic movements in complex objects consisting of multiple linked components.
Get Pricethe Cd of the vehicle was reduced by modifying the front design of the fan regulating the fan speed. For the Axial Fan CFD involved in this Computational Fluid Dynamic Analysis, we also evaluated the change in Cd value when the passive filtration system is active. This study was similar to a previous CFD Simulation study involving a Centrifugal ...
Get Price2020-1-26 · 1 Flow Modeling and Testing of ESPs ICESP 2018 Charlotte, NC, USA Robert Mudry, P.E. Airflow Sciences Corporation Livonia, MI, USA [email protected]
Get Price2021-8-22 · Simulations were done with these meshes for one selected scenario in which the airflow Reynolds number is 7.36 × 10³ and the particle diameter is 10 µm. The results showed that among these three meshes, the mesh with 160000 cells was accurate enough for our study simulations (for the duct with the aspect ratio of 1).
Get Price2019-6-26 · 'Evaluation of the Turbulence Models for the Simulation of the Flow over a National Advisory Committee for Aeronautics (NACA) 0012 Airfoil,' Journal of Mechanical Engineering Research, vol. 4, no. 3, pp. 100-111, March 2012. [2] G. N. Vanderplaats and R. M. Hicks, 'Numerical Airfoil
Get Price2021-3-29 · The numerical results predict the patterns of airflow and droplets/aerosols movement inside the dental clinic and identify the locations with a high risk of contamination. This study can be used to provide guidelines for safer operations of healthcare facilities during the present and future pandemics for both medical staff and patients.
Get Price2020-11-1 · Bates et al.67 performed computational fluid dynamics simulations to access the respiratory airflow in the human upper oral airway with airway wall movement. The breathing flow rate data were acquired by imaging the breathing cycle of the participant while wearing a size-5 anesthesia facemask [ Fig. 1(c) ].
Get Price2013-12-7 · Image-based in silico modeling tools provide detailed velocity and particle deposition data. However, care must be taken when prescribing boundary conditions to model lung physiology in health or disease, such as in emphysema. In this study, the respiratory resistance and compliance were obtained by solving an inverse problem; a 0D global model based on healthy and emphysematous rat ...
Get Price2019-9-15 · The factors of the DOE include: a) airflow level, b) brake size, c) rotor style, d) caliper position, e) brake rotation, f) brake rotational speed, and g) fixture style. Numerical simulations are performed using NGA, a high-order, multi-physics large-eddy simulation code. Particles are tracked individually in a Lagrangian manner.
Get Price2010-12-1 · The maximum difference was 10.4% for SPECT/CT data in the left lower lobe, 7.8% for CT data in the right lower lobe; and 11.2% for CFD data in the right lower lobe. An overview of the differences in lobar distribution for all methods can be found in Table 3. Table 3 Range of Inhaled Air toward the Indicated Lobes.
Get PriceBuilding Simulation: An International Journal publishes original, high quality, peer-reviewed research papers and review articles dealing with modeling and simulation of buildings including their systems. The goal is to promote the field of building science and technology to such a level that modeling will eventually be used in every aspect of building construction as a routine instead of an ...
Get Price2021-2-5 · In the present study, a pyramid-shaped solar panel as a novel design of a photovoltaic (PV) panel is simulated. The simulation process was performed by means of an open source CFD software (Open foam, Version 2.3.1). Also, the Bouyant Boussinesq Pimple Foam solver was used in this study. In this study, four PVs were fabricated in the form of pyramid-shaped construction with trapdoors at the ...
Get Price2020-12-18 · A computer model deepens our understanding of airflow while wearing face masks, where particles land in the respiratory tract and the effectiveness of three-layer surgical masks.
Get Price2020-7-31 · Multibody dynamics analysis (MDA) is one of these techniques and although it originated as a tool used in the engineering and automotive industry, it holds great potential to address palaeontological questions as well. MDA allows the simulation of dynamic movements in complex objects consisting of …
Get Price2021-8-11 · Simulation is the imitation of some real thing, state of affairs, or process. The act of simulating something generally entails representing certain key characteristics or behaviours of a selected physical or abstract system. Simulation is used in many contexts, including the modeling of natural systems or human systems in order to gain insight ...
Get Price2020-11-1 · Bates et al.67 performed computational fluid dynamics simulations to access the respiratory airflow in the human upper oral airway with airway wall movement. The breathing flow rate data were acquired by imaging the breathing cycle of the participant while wearing a size-5 anesthesia facemask [ …
Get Price2013-12-7 · Image-based in silico modeling tools provide detailed velocity and particle deposition data. However, care must be taken when prescribing boundary conditions to model lung physiology in health or disease, such as in emphysema. In this study, the respiratory resistance and compliance were obtained by solving an inverse problem; a 0D global model based on healthy and emphysematous rat ...
Get PriceBuilding Simulation: An International Journal publishes original, high quality, peer-reviewed research papers and review articles dealing with modeling and simulation of buildings including their systems. The goal is to promote the field of building science and technology to such a level that modeling will eventually be used in every aspect of building construction as a routine instead of an ...
Get Price2021-3-29 · It is found that for both isothermal and reacting (experimental and simulations) flows, the swirling flow style is well captured. In addition, the CTRZ is notably affected by the swirl strength where increasing the swirl number leads to an increase in the length of the CR.
Get Price2020-12-18 · A computer model deepens our understanding of airflow while wearing face masks, where particles land in the respiratory tract and the effectiveness of three-layer surgical masks.
Get Price2010-12-1 · The maximum difference was 10.4% for SPECT/CT data in the left lower lobe, 7.8% for CT data in the right lower lobe; and 11.2% for CFD data in the right lower lobe. An overview of the differences in lobar distribution for all methods can be found in Table 3. Table 3 Range of …
Get PriceContact. work Room BB17a Block B Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia; work +6 (03) 8924 8116; fax +6 (03) 8924 8017; [email protected]; Biography. Ir. Dr. Ng Khai Ching obtained his Bachelor degree in Mechanical Engineering (1 st CH with Vice-Chancellor Award) from Universiti Tenaga Nasional (UNITEN), Malaysia in 2003. . Soon after his ...
Get PriceObjective To evaluate nasal airflow characteristics during physiologic breathing in normal and pathologic conditions.. Design The choana of an anatomical human model was connected to a pump that simulated physiological pressure changes in the upper airway system. Normal ambient air was used as medium. The airstream was marked with aerosolized water particles, and was observed through an exact ...
Get Price2020-7-31 · Multibody dynamics analysis (MDA) is one of these techniques and although it originated as a tool used in the engineering and automotive industry, it holds great potential to address palaeontological questions as well. MDA allows the simulation of dynamic movements in complex objects consisting of multiple linked components.
Get Price2021-8-11 · Simulation is the imitation of some real thing, state of affairs, or process. The act of simulating something generally entails representing certain key characteristics or behaviours of a selected physical or abstract system. Simulation is used in many contexts, including the modeling of natural systems or human systems in order to gain insight ...
Get Price2013-12-7 · Image-based in silico modeling tools provide detailed velocity and particle deposition data. However, care must be taken when prescribing boundary conditions to model lung physiology in health or disease, such as in emphysema. In this study, the respiratory resistance and compliance were obtained by solving an inverse problem; a 0D global model based on healthy and emphysematous rat ...
Get PriceNumerical simulation (computational fluid dynamics CFD) ... Numerical simulation of the airflow over block arrays. ... The term 'Environment' is always related to our individual life style and the social system that is a huge mass congregated by individual human beings. So then, the scope to grasp not only the environment but also human entity ...
Get PriceThe present paper reports the mean flow field behavior of an isothermal turbulent impinging jet in a room. The detailed experimental study is carried out to validate the numerical simulations, and the predictions are performed by means of the RNG k-ε and SST k-ω model. The comparisons between the predictive results and the experimental data ...
Get PriceThe combined TAGUCHI method and numerical simulations was used to optimize the characteristic parameters of the cooperative injection and suction jet that affect the power extraction characteristics of the S-AFA. Under the Reynolds number of 6×104 and the pitching axis location at the center of …
Get PriceCFD or computational fluid dynamics is the analysis of the Fluid flow of liquids and gases in and around specifically designed objects under study. It also involves the numerical modeling and CFD simul ation of thermal behaviors via CFD Thermal analysis. The equations …
Get Price2018-12-29 · The flow behavior is studied and a comparison of results from the simulations and the experimental wind tunnel data is presented. The ability of Computational Fluid Dy-namics (CFD) techniques in simulating wind flow over entire wind turbine assembly is also displayed by carrying out moving mesh simulations of a full wind turbine. v
Get PriceContact. work Room BB17a Block B Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia; work +6 (03) 8924 8116; fax +6 (03) 8924 8017; [email protected]; Biography. Ir. Dr. Ng Khai Ching obtained his Bachelor degree in Mechanical Engineering (1 st CH with Vice-Chancellor Award) from Universiti Tenaga Nasional (UNITEN), Malaysia in 2003. . Soon after his ...
Get Price2020-7-31 · Multibody dynamics analysis (MDA) is one of these techniques and although it originated as a tool used in the engineering and automotive industry, it holds great potential to address palaeontological questions as well. MDA allows the simulation of dynamic movements in complex objects consisting of …
Get Price1996-4-1 · We simulate two- and three-dimensional (2D and 3D) aerosol transport for different particle diameters within alveolated ducts. In agreement with previous studies (W. J. Federspiel and J. J. Fredber...
Get Price2010-7-1 · The study of airflow around occupants seated in desks equipped with upper and lower air terminal devices, for slightly warm environments, was analyzed. The turbulent and mean airflow in the exit air terminal devices and around an occupant seated for two different air flow rates were evaluated.
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