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The simulation results are analysed with respect to vorticity magnitude (VM), turbulent kinetic energy (TKE), turbulent intensity (TI), and radial velocity (RV). For better understanding of the airflow behaviour in different parts of the nozzle, the contours of 3D and surface streamlines are analysed.
Get PriceRequest PDF | Numerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites | The current study highlights the superiority of nozzles with forwarding ...
Get PriceNumerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites. ... Nozzle CONF I and II work on backwards airflow principles among these configures, while CONF III functions with forwarding airflow. Commingling process efficiency of nozzle designs is analysed in terms of vorticity magnitude ...
Get Price2020-2-1 · Here a peak flow rate of 20 L/min and the breathing frequency of f = 0.25 HZ were assumed for the unsteady airflow simulation. Using Equation in (1) leads to the equivalent mean flow rate of 12.8 L/min. The time variations of the boundary condition for cyclic breathing and its equivalent mean flow rate are shown in Fig. 2.. Download : Download high-res image (176KB)
Get Price2002-5-1 · The numerical modeling of airflow was performed using the computational fluid dynamics (CFD) code Fluent and two levels of turbulence modeling: the standard k–ε model and a model with a second-moment closure, the Reynolds stress model (RSM). Only the results obtained using the RSM model showed agreement with the experimental data.
Get Price2020-9-1 · Numerical simulation research is complementary to the studies in field measurement. In numerical simulation, influential factors, such as ambient wind speed and direction, atmospheric stability, and other meteorological parameters are controllable (Zhang, Tang, et al., 2016). Thus, the characteristics of the airflow field can be evaluated in ...
Get Price2020-5-15 · Numerical simulation was divided into three steps. First, the size of the computational area was defined and macro parameters, such as airflow speed, were calculated. The computational area was determined as the domain in which the macro parameter value did not change with the calculation area size, and was meshed with the calculation domain.
Get Price2001-11-1 · Numerical simulation of flow field around a cow using 3-D body-fitted coordinate system ... Airflow through an assumed inlet is defined by a numerical value. (2) Airflow is considered to be fully developed at the outlet. (3) No-slip condition, that is, the velocity at the wall equals to zero, is adopted at the walls. ... more heat is lost by ...
Get Price2008-7-1 · The 2-D and 3-D simulations are used to support the development of a parameterization scheme for scalar transfer. The CFD model-calculated scalar fluxes for the 2-D cases are found to agree well with the estimates of the parameterization scheme and wind tunnel data. The flow behavior and pollution distribution in 3-D canyons are much more complex.
Get Price2020-5-15 · Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition Yunwei Zhang, Zhaolin Gu*, Chuck Wah Yu School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China ABSTRACT
Get PriceThe simulation results are analysed with respect to vorticity magnitude (VM), turbulent kinetic energy (TKE), turbulent intensity (TI), and radial velocity (RV). For better understanding of the airflow behaviour in different parts of the nozzle, the contours of 3D and surface streamlines are analysed.
Get PriceRequest PDF | Numerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites | The current study highlights the superiority of nozzles with forwarding ...
Get PriceNumerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites. ... Nozzle CONF I and II work on backwards airflow principles among these configures, while CONF III functions with forwarding airflow. Commingling process efficiency of nozzle designs is analysed in terms of vorticity magnitude ...
Get Price2020-2-1 · Here a peak flow rate of 20 L/min and the breathing frequency of f = 0.25 HZ were assumed for the unsteady airflow simulation. Using Equation in (1) leads to the equivalent mean flow rate of 12.8 L/min. The time variations of the boundary condition for cyclic breathing and its equivalent mean flow rate are shown in Fig. 2.. Download : Download high-res image (176KB)
Get Price2002-5-1 · The numerical modeling of airflow was performed using the computational fluid dynamics (CFD) code Fluent and two levels of turbulence modeling: the standard k–ε model and a model with a second-moment closure, the Reynolds stress model (RSM). Only the results obtained using the RSM model showed agreement with the experimental data.
Get Price2020-9-1 · Numerical simulation research is complementary to the studies in field measurement. In numerical simulation, influential factors, such as ambient wind speed and direction, atmospheric stability, and other meteorological parameters are controllable (Zhang, Tang, et al., 2016). Thus, the characteristics of the airflow field can be evaluated in ...
Get Price2020-5-15 · Numerical simulation was divided into three steps. First, the size of the computational area was defined and macro parameters, such as airflow speed, were calculated. The computational area was determined as the domain in which the macro parameter value did not change with the calculation area size, and was meshed with the calculation domain.
Get Price2001-11-1 · Numerical simulation of flow field around a cow using 3-D body-fitted coordinate system ... Airflow through an assumed inlet is defined by a numerical value. (2) Airflow is considered to be fully developed at the outlet. (3) No-slip condition, that is, the velocity at the wall equals to zero, is adopted at the walls. ... more heat is lost by ...
Get Price2008-7-1 · The 2-D and 3-D simulations are used to support the development of a parameterization scheme for scalar transfer. The CFD model-calculated scalar fluxes for the 2-D cases are found to agree well with the estimates of the parameterization scheme and wind tunnel data. The flow behavior and pollution distribution in 3-D canyons are much more complex.
Get Price2020-5-15 · Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition Yunwei Zhang, Zhaolin Gu*, Chuck Wah Yu School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China ABSTRACT
Get PriceIn the present study, the effects of endoscopic sphenoidotomy surgery on the flow patterns and deposition of micro-particles in the human nasal airway and sphenoid sinus were investigated. A realis...
Get Price2019-2-9 · Numerical Simulation of the Airflow Over a Military Aircraft with Active Intake T Triantafyllou*, T Nikolaidis, M Diakostefanis, P Pilidis Cranfield University, School of Aerospace, Transport and Manufacturing, College Rd, Cranfield, Bedford MK43 0AL, United Kingdom ABSTRACT The aim of the study presented herein is to numerically predict the ...
Get Price2010-6-1 · 1. Introduction. On a global scale, rainfall in the trade wind belt is minimal. However, rainfall over the Hawaiian Islands is frequent and abundant (Schroeder et al. 1977) because of terrain and local trade wind interactions.Hawaii’s array of microclimates, ranging from its humid and tropical windward flanks to dry and sometimes desertlike leeward areas (Giambelluca et al. 1986), make it an ...
Get Price2015-3-24 · Numerical simulation of airflow in the human nasal cavity. Keyhani K, Scherer PW, Mozell MM. J Biomech Eng, (4):429-441 1995 MED: 8748525 Numerical simulation of the flow field in a model of the nasal cavity. Hörschler. Comput. Fluids 2003 Investigation of the …
Get PriceOR-05-08-5 - Numerical Simulation of Airflow and Airborne Pathogen Transport in Aircraft Cabinsâ Part II: Numerical Simulation of Airborne Pathogen Transport
Get PriceLevel-3 biosafety laboratory, Airflow distribution, Numerical simulation, Air exchange efficiency, Age of air. The First International Conference on Building Energy and Environment Proceedings . References. To explore the background and basis of the node document. Springer Journals Database ...
Get Price2020-8-7 · Keywords: CFD, numerical simulation, grid independence, airflow velocity, temperature distribution ABSTRACT Grid independence verification was implemented to improve the reliability of CFD numerical simulation in pigsty. The effects of four different grid numbers on airflow and temperature simulation of 0.4m, 1.0m and 1.6m heights were compared.
Get Price2021-1-1 · Predictive numerical simulation of airflow uniformity in canopy plants could provide a suitable environment for plant growth. A numerical investigation of airflow in a photosynthesis chamber was conducted using the Computational Fluid Dynamics (CFD) model. This research-validated the numerical model with measurements performed in a bare bottom ...
Get PriceNUMERICAL SIMULATION OF AIRFLOW DISTRIBUTION IN A MIXED FLOW DRYER Holger Scaar*, Fabian Weigler, Jochen Mellmann Department of post-harvest technology, Leibniz Institute of Agricultural Engineering (ATB) Potsdam-Bornim, Max-Eyth-Allee 100, Potsdam 14469, Germany *Tel.:+49331/5699336, E-Mail: [email protected] Abstract Mixed-flow dryers are widely used to …
Get Price2019-11-21 · The results of numerical simulation showed that the dust-carrying airflow, after being blocked by the coal cutter, dispersed in the lateral direction, leading to an increase of airflow velocity on the walkway side to 1.75 m s −1, and a dust concentration as high as 2500 mg m −3. At the same time, an airflow vortex area with the largest ...
Get PriceTaking Majiazhai double highway tunnel as a prototype, the mathematical model of double tunnel fire is established to analyze smoke plume spread and diffusion during air flow organization process of highway tunnel fire. In the conditions of double tunnel fire …
Get PriceThese adjustments allow for the simulation of disease transmission using less than 1/100 the computing hardware resources required for an equivalent LES of airflow and particle transport. This paper is an elaboration on the numerical study of the transport of airborne pathogens in an aircraft cabin.
Get Price2018-5-6 · Numerical Simulation of Airflow around Horizontal Axis Wind Turbine Yu Lin1, Nian-Ze Lee1，Shiu-Wu Chau2 Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei Email:[email protected]
Get PriceCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Numerical simulation can provide a valuable tool in evaluating the characteristics of possible sites for new telescopes. This technique can provide accurate information about topographically induced atmospheric disturbances and turbulent boundary layers occurring in the high Reynolds number airflows over such sites.
Get Price2004-11-4 · A numerical simulation in a bilateral three‐dimensional model of the human nose based on computed tomography was employed. Temperature distribution and airflow patterns during expiration were displayed. Cooling of the expiratory air primarily takes place in the areas of inferior and middle turbinate. Areas of the highest decrease in ...
Get PriceA Numerical Simulation of Unsteady Airflow in HDDs The shroud gap was set to 2 mm to observe sec-ondary flows more easily. The time step for unsteady calculation was set to 0.1 ms to detect vibrations of up to 5 kHz. The turbulence model constant was set to 0.1 as the most general value.
Get PriceAn initial study to develop a numerical tool using CFD methods for investigating the potential of disease transmission in commercial aircraft is completed. To gain insight of the general airflow pattern, a detailed CFD model of a small section in the passenger cabin of a B767-300 passenger cabin was built and a Reynolds-averaged Navier-Stokes (RANS) simulation was performed.
Get Price2001-8-17 · CHAPTER 6 APPLICATION OF NUMERICAL SIMULATION TO VENTILATED FLOW PROBLEMS 102 6.1 Introduction Airflow in ventilated enclosures can be divided into the following groups: mixing type where the flow is driven by forced convection, and natural convection where the main driving force is the buoyancy.
Get Price2003-4-12 · Numerical modeling is a natural and complementary tool for the understanding of orographic precipitation. Barros and Lettenmaier propose a review of the different numerical approaches and their associated restrictions and limitations. The 3D modeling of both circulation dynamics and cloud microphysics over a wide range of space and timescales ...
Get Price2021-5-19 · In this subsection, we will discuss the effect of the Mach number on the jet atomization in numerical simulations. Physical properties of fluids considered in numerical simulations have been shown in Table II. 480 × 480 × 320 computational grids are used, and the number of pts/radius achieved with the grid is 16 pts/radius. The Mach numbers ...
Get PriceThe simulation results are analysed with respect to vorticity magnitude (VM), turbulent kinetic energy (TKE), turbulent intensity (TI), and radial velocity (RV). For better understanding of the airflow behaviour in different parts of the nozzle, the contours of 3D and surface streamlines are analysed.
Get PriceRequest PDF | Numerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites | The current study highlights the superiority of nozzles with forwarding ...
Get PriceNumerical simulation of airflow behaviour and nozzle geometry on commingling for thermoplastic composites. ... Nozzle CONF I and II work on backwards airflow principles among these configures, while CONF III functions with forwarding airflow. Commingling process efficiency of nozzle designs is analysed in terms of vorticity magnitude ...
Get Price2020-2-1 · Here a peak flow rate of 20 L/min and the breathing frequency of f = 0.25 HZ were assumed for the unsteady airflow simulation. Using Equation in (1) leads to the equivalent mean flow rate of 12.8 L/min. The time variations of the boundary condition for cyclic breathing and its equivalent mean flow rate are shown in Fig. 2.. Download : Download high-res image (176KB)
Get Price2002-5-1 · The numerical modeling of airflow was performed using the computational fluid dynamics (CFD) code Fluent and two levels of turbulence modeling: the standard k–ε model and a model with a second-moment closure, the Reynolds stress model (RSM). Only the results obtained using the RSM model showed agreement with the experimental data.
Get Price2020-9-1 · Numerical simulation research is complementary to the studies in field measurement. In numerical simulation, influential factors, such as ambient wind speed and direction, atmospheric stability, and other meteorological parameters are controllable (Zhang, Tang, et al., 2016). Thus, the characteristics of the airflow field can be evaluated in ...
Get Price2020-5-15 · Numerical simulation was divided into three steps. First, the size of the computational area was defined and macro parameters, such as airflow speed, were calculated. The computational area was determined as the domain in which the macro parameter value did not change with the calculation area size, and was meshed with the calculation domain.
Get Price2001-11-1 · Numerical simulation of flow field around a cow using 3-D body-fitted coordinate system ... Airflow through an assumed inlet is defined by a numerical value. (2) Airflow is considered to be fully developed at the outlet. (3) No-slip condition, that is, the velocity at the wall equals to zero, is adopted at the walls. ... more heat is lost by ...
Get Price2008-7-1 · The 2-D and 3-D simulations are used to support the development of a parameterization scheme for scalar transfer. The CFD model-calculated scalar fluxes for the 2-D cases are found to agree well with the estimates of the parameterization scheme and wind tunnel data. The flow behavior and pollution distribution in 3-D canyons are much more complex.
Get Price2020-5-15 · Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition Yunwei Zhang, Zhaolin Gu*, Chuck Wah Yu School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China ABSTRACT
Get Price2017-12-6 · We applied numerical simulations to describe the mean airflow patterns and distributions of aerosols in an anatomically realistic geometry of the human airways under the steady inspiration condition with a flow rate of 60 l min − 1. The geometry considered extended from the mouth inlet to the eighth bronchial generations.
Get Price2021-4-19 · 2.2 Numerical Simulation 2.2.1 Setup of Numerical Experiments. The Advanced Research Weather Research and Forecasting (WRF) model, version 3.9 (Skamarock et al., 2008), was used to simulate the hail-producing convective system. The grid configuration is shown in Figure 3 and the model setups are summarized in Table 1.
Get Price2009-12-16 · Experimental and Numerical Analysis of Heat Transfer and Airflow on an Interactive Building Facade Roberto Fuliotto1, Francesco Cambuli1, Natalino Mandas1, Nicoletta Bacchin2, Giampiero Manara2, and Qingyan Chen3,* 1 D.I.Me.Ca. Dipartimento di Ingegneria Meccanica, Università degli studi di Cagliari, Italy 2 Research & Engineering Department, Permasteelisa S.p.A., Italy
Get Price2004-8-12 · [5], These simulations are carried out with the simulation code Matlab-Simulink. His model is derived from the heat balances and airflow models. Some more detailed models uses the CFD approach for accurate representation. For instance the finite element method to solve the non–linear equations of
Get Price2011-12-1 · a. Numerical model. Our simulations use version 3.0.1 of the Advanced Research Weather Research and Forecasting (ARW-WRF) model (Skamarock and Klemp 2008). The Thompson et al. (2008) bulk microphysical parameterization, which predicts the mass of cloud water, cloud ice, rain, snow, and graupel, is used in all simulations.
Get Price2018-7-3 · To better understand and control breakup mechanisms of turbulent oscillating two-phase jets, numerical investigations are conducted for a jet with liquid Reynolds number Re l = 8701 and liquid Weber number We l = 4759. Simulations are performed using a volume of fluid method.
Get Price2015-11-17 · We perform two types of numerical simulations. In the first one we compute the wind flow over the two-dimensional profile shown in Fig. 2a, while in the second type we consider the full three ...
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 Price2012-5-23 · Viscous Shock-Layer Simulation of Airflow past Ablating Blunt Body with Carbon Surface. ... Nanoscale oxidation behavior of carbon fibers revealed with in situ gas cell STEM. Scripta Materialia, Vol. 199 ... Numerical Simulation of Graphite Ablation Induced Outgassing Effects on Hypersonic Boundary Layer Receptivity over a Cone Frustum.
Get Price2010-10-6 · parachutes and airflow with the required precision and current techniques (ENSICA had had to restrict to a quarter model with symmetry conditions) ; the work was then oriented to prototype or specify new simulation features that would eventually lead to the full scale simulation of a parachute or event a cluster of parachutes.
Get Price2012-3-22 · [8] We perform direct numerical simulation of a turbulent Couette flow over a wavy water surface. The schematic of the numerical experiment is presented in Figure 1 . A Cartesian framework is considered where x axis is oriented along the mean wind flow, z axis is directed vertically upward, and y axis is transversal to the mean flow and ...
Get Price2021-6-25 · ransfoil: console to simulate airflow around an airfoil based on RANS approach. Rayleigh - dynamo in spherical geometry: 3-D convection code designed for the study of dynamo behavior in spherical geometry. It evolves the incompressible and anelastic MHD equations in spherical geometry using a pseudo-spectral approach.
Get PriceWe study wind turbulence over breaking waves based on direct numerical simulation (DNS) of two-fluid flows. In the DNS, the air and water are simulated as a coherent system, with the interface captured using the coupled level-set and volume-of-fluid method.
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 Price2017-8-28 · To implement the coupled simulation, we selected a Modelica modelling language (Fritzson 1998) to model the building envelope, HVAC system, and feedback control. Modelica is an equation-based, object-oriented modelling language for the simulation of multi-domain dynamic systems. In this study, our implementation was
Get Price2011-5-27 · numerical tasks including contact, various damage initiation and evolution models, failure of elements and removal of failed elements, modelling of pressures and loads exerted during the impact and others. ABAQUS/Explicit has been chosen to perform nonlinear transient numerical analyses in order to use its large library of elements and
Get PriceThe emergence of the novel coronavirus has led to a global pandemic which has led to the airline industry facing severe losses. For air travel to recover, airlines need to ensure safe air travel. In this paper, the authors have modeled droplet dispersion after a single breath from an index patient. Computational Fluid Dynamics (CFD) simulations are conducted using the k-ωSST turbulence model ...
Get Price2015-7-29 · 1. Introduction to modeling and simulation of heat transfer. “Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy and/or heat between physical systems. Heat transfer is classified into various mechanisms, such as heat conduction, convection, thermal radiation, and ...
Get Price2015-4-24 · NUMERICAL METHOD The CAE tool utilized in this study, STAR-CCM+, utilizes a fully 3-dimensional, Navier-Stokes finite volume methodology for simulation of the fluid flow; with a great deal of literature available regarding the details [12]. Particle behaviour is simulated with a …
Get Price2018-7-3 · To better understand and control breakup mechanisms of turbulent oscillating two-phase jets, numerical investigations are conducted for a jet with liquid Reynolds number Re l = 8701 and liquid Weber number We l = 4759. Simulations are performed using a volume of fluid method.
Get Price2020-1-22 · The numerical simulations presented in this study have been conducted with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5), version 3.3 (Grell et al. 1995).The model solves the nonhydrostatic equations of motion in a terrain-following sigma coordinate system.
Get Price2012-5-23 · Viscous Shock-Layer Simulation of Airflow past Ablating Blunt Body with Carbon Surface. ... Nanoscale oxidation behavior of carbon fibers revealed with in situ gas cell STEM. Scripta Materialia, Vol. 199 ... Numerical Simulation of Graphite Ablation Induced Outgassing Effects on Hypersonic Boundary Layer Receptivity over a Cone Frustum.
Get Price2001-5-1 · Numerical simulations are used to augment the observational analysis and to further explore the structure and dynamics of the landfalling warm front. One motivating factor for this study is that landfalling frontal systems impinging on complex three-dimensional orography in the presence of time-dependent flow are still not well understood.
Get PriceReynolds Averaged Navier–Stokes Simulations of the Airflow in a Centrifugal Fan Using OpenFOAM The use of numerical models through computational tools allows studying the inner flow of centrifugal fans; this is a normal practice in engineering and scientific communities.
Get Price2016-6-30 · The object-oriented methodology, element descriptions, BESTEST cases for code validation, and transient thermal simulations of two different cases are presented in this paper. 1. Introduction This work is addressed to contribute to the progress in the numerical simulation of the thermal and fluid flow processes within and around buildings.
Get Price2015-2-7 · The patterns of airflow during inhalation seen across all six bat species are very similar to those observed in dogs and rats [5,7], perhaps suggesting common functional demands for olfactory airflow and performance across a broad array of mammals. During exhalation, however, bats differ from rodents and dogs, in which all exhaled air is ...
Get PriceRecent Advances in Computational Science and Engineering. IC-SEC 2002 serves as a forum for engineers and scientists who are involved in the use of high performance computers, advanced numerical strategies, computational methods and simulation in various scientific and engineering disciplines.
Get PriceThe simulation system uses Windows as the platform, selects the VB.net object-oriented language, uses ODBC and ADO technology to access the Access database, and adopts the internationally recognized 3D graphics industry-standard OpenGL as the technical support to realize the 3D visualization simulation of mine gas explosion disaster process.
Get PriceMultifield coupling among gas flow, heat transfer, structure deformation and flight control is an important phenomenon for hypersonic vehicle. The coupling mechanism can be simplified according to simulation purpose. Typical simulation tests for different phases of hypersonic vehicle guidance, navigation and control (GNC) system design process are presented and the coupling boundaries are also ...
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