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Computational analysis of Surface Pressure Distribution over a 2D Wedge in the Supersonic and Hypersonic Flow Regimes

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1637-1653页

作者： Javed S.Shaikh Krishna Kumar Khizar A.Pathan Sher A.Khan MIT School of Engineering MIT ADT UniversityPune412201India Trinity College of Engineering and Research Pune411048India Department of Mechanical Engineering International Islamic University MalaysiaKuala Lumpur53100Malaysia

The complex fluid-dynamic instabilities and shock waves occurring along the surface of a two-dimensional wedge at high values of the Mach number are studied here through numerical solution of the governing equations.Moreover,a regression model is implemented to determine the pressure distribution for various Mach numbers and angles of incidence.The Mach number spans the interval from 1.5 to 12.The wedge angles(θ)are from 5°to 25°.The pressure ratio(P2/P1)is reported at various locations(x/L)along the 2D wedge.The results of the numerical simulations are compared with the regression model showing good agreement.

关键词： cfd analysis supersonic wedge angle Mach number

A desktop customised 3D printer with dual extruders to produce electronic circuitry

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Frontiers of Mechanical Engineering 2018年第4期13卷 528-534页

作者： Javaid BUTT Dominic Adaoiza ONIMOWO Mohammed GOHRABIAN Tinku SHARMA Hassan SHIRVANI Anglia Ruskin University CM1 1 SQ Chelmsford UK

3D printing has opened new horizons for the manufacturing industry in general, and 3D printers have become the tools for technological advancements. There is a huge divide between the pricing of industrial and desktop 3D printers with the former being on the expensive side capable of producing excellent quality products and latter being on the low-cost side with moderate quality results. However, there is a larger room for improvements and enhancements for the desktop systems as compared to the industrial ones. In this paper, a desktop 3D printer called Prusa Mendel i2 has been modified and integrated with an additional extruder so that the system can work with dual extruders and produce bespoke electronic circuits. The communication between the two extruders has been established by making use of the In-Chip Serial Program- ming port on the Arduino Uno controlling the printer. The biggest challenge is to control the flow of electric paint （to be dispensed by the new extruder） and cfd （Computa- tional Fluid Dynamics） analysis has been carried out to ascertain the optimal conditions for proper dispensing. The final product is a customised electronic circuit with the base of plastic （from the 3D printer＇s extruder） and electronic paint （from the additional extruder） properly dispensed to create a live circuit on a plastic platform. This low-cost enhancement to a desktop 3D printer can provide a new prospect to produce multiple material parts where the additional extruder can be filled with any material that can be properly dispensed from its nozzle.

关键词： 3D printing Arduino Uno extruder multiple materials electronic circuits customisation cfd analysis

Improving energy storage by PCM using hybrid nanofluid[(SWCNTs-CuO)/H_(2)O]and a helical(spiral)coil:Hybrid passive techniques

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Theoretical & Applied Mechanics Letters 2023年第4期13卷 299-310页

作者： Aliakbar Hosseinpour Mohsen Pourfallah Mosayeb Gholinia Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Mazandaran University of Science and TechnologyBabolIran CNR-ITAE–Institute of Advanced Energy Technologies“Nicola Giordano” MessinaItaly

The aim of this study is the numerical analysis of the melting process of the phase change material(PCM)in a spiral coil.The space between the inner tube and outer shell is filled with RT-50 as PCM.Moreover,the hybrid nanofluid(with a carbon component)flows through the inner tube.The novelty of this work is to use different configurations of fin and different percentage of hybrid nanoparticles(SWCNTs-Cu O)on the PCM melting process.In the numerical model created by ANSYS-Fluent,the effect of various inlet temperatures is investigated.The results indicate that the extended surface created by extra fin has a dominant effect on melting time,so by adding the third fin,the melting time is reduced by 39.24%.The next most influential factor in PCM melting is the inlet temperature of the working fluid,so that 10°C increment of temperature result in the PCM melting time decreased by 35.41%.

关键词： PCM melting Helical coli Thermal energy storage cfd analysis

Numerical analysis of Heating Technique in Corium Melt Pool Convection Flow Field &Thermal Interaction in a Volumetrically Heated Molten Pool

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World Journal of Nuclear Science and Technology 2023年第1期13卷 1-10页

作者： Mohammad Khan Lubon Putul Saad Islam Department of Nuclear Engineering University of Dhaka Dhaka Bangladesh

In-Vessel Retention (IVR) is one of the existing strategies of severe accident management of LWR, which intends to stabilize and isolate corium & fission products inside the reactor pressure vessel (RPV) and primary containment structure. Since it has become an important safety objective for nuclear reactors, it is therefore needed to model and evaluate relevant phenomena of IVR strategy in assessing safety of nuclear power reactors. One of the relevant phenomena during accident progression in the oxidic pool is non-uniform high heat generation occurring at large scale. Consequently, direct experimental studies at these scales are not possible. The role computer codes and models are therefore important in order to transpose experimental results to reactor safety applications. In this paper, the state-of-the-art ANSYS FLUENT cfd code is used to simulate Non-uniform heat generation in the lower plenum by the application of Cartridge heating under severe accident conditions to derive the basic accident scenario. However, very few studies have been performed to simulate non-uniform decay heat generation by Cartridge heaters in a pool corresponding lower plenum of power reactor. The current investigation focuses on non-uniform heating in the fluid domain by Cartridge heaters, which has been done using ANSYS FLUENT cfd code by K-epsilon model. The computed results are based on qualitative assessment in the form of temperature and velocity contour and quantitative assessment in terms of temperature and heat flux distribution to assess the impact of heating method on natural convective fluid flow and heat transfer.

关键词： IVR ANSYS FLUENT LWR cfd analysis Core Degradation RPV

A Study on Fluidic Diode for Wave Energy Conversion-Effect of Bypass Geometry on the Turbine Performance

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Open Journal of Fluid Dynamics 2020年第3期10卷 270-278页

作者： Keito Matsumoto Manabu Takao Shinya Okuhara Miah Md. Ashraful Alam Yoichi Kinoue National Institute of Technology Matsue College Matsue Japan Institute of Ocean Energy Saga University Saga Japan

A twin-impulse turbine for bi-directional flow has been developed for wave energy converter. However, the previous studies elucidated that the mean efficiency of the twin turbine is much lower than that of the impulse turbine for a unidirectional flow because a portion of airflow passes through the reverse flow turbine whose efficiency is very low. Therefore, a fluidic diode was adopted in the twin-impulse turbine in order to reduce the air flow through the reverse flow turbine. In this study, the rectification effect of the fluidic diode was investigated where a bypass is introduced into a blunt body. A computational fluid dynamics (cfd) analysis was conducted to investigate the effect of fluidic diodes on the turbine performance. In this analysis, RANS equations were used as the governing equations and the standard k-ε model was used as the turbulence model. The computational domain is composed of a circular tube and fluidic diode, and the domain meshed with an approximately 1.5 million mesh elements. As a result, it was found that the rectification effect of the fluidic diode is enhanced by installing a blunt body with a bypass hole of 5° taper angle.

关键词： Fluidic Diode Wave Energy Conversion Twin-Impulse Turbine cfd analysis

AERODYNAMIC MULTI-OBJECTIVE OPTIMIZATION DESIGN STUDY ON AIR DEFLECTOR OF LIGHT DUTY TRUCK

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AERODYNAMIC MULTI-OBJECTIVE OPTIMIZATION DESIGN STUDY ON AIR...

Numerical Study on the Effect of Rear-diffuser Angle on the Aerodynamic Performance for the Driving Stability of a Blunt Body

2017汽车空气动力学分会学术年会

作者： Ma Jinying Li Chunpeng Fu Qiang Sun Shaoyun FAW Co. Ltd R＆D Center

cfd analysis and multi-parameter multi-objective optimization method is used to study the aerodynamic design on the air deflector of a van-body light duty truck.The process starts with a shape parameterization of the air deflector,and then selects eight factors representing the characteristics of the air deflector.Adaptive sampling method is used to fill the sample space because of its characteristic of reducing the number of solutions.After that the approximate model is established.The optimization goal is getting minimum value of Cd（vehicle aerodynamic drag coefficient）.Finally,the global optimization is performed by using the multi Island genetic algorithm.After optimization,the optimized design can result in a 13.6%reduction in Cd compared to the truck that matched the original air deflector.In addition,Pareto front line is introduced to find the optimal matching of all these parameters considering simultaneously the Cd and the weight of air deflector.According to the results,designers can consider the two factors to choose the best model.

关键词： Parameter Optimization Air Deflector cfd analysis Drag Coefficient Weight

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Numerical Study on the Effect of Rear-diffuser Angle on the ...

Brief Clarification of Hydrodynamic Mechanisms of Rudder Fins

2018中国汽车工程学会年会

作者： SUN Qingzhu CHUL-Ho Kim Department of Automotive Engineering Seoul National University of Science and Technology

Rear-diffuser Angle is an important factor influencing the aerodynamic performance of a blunt body.Numerical study is performed to evaluate the influence of the Rear-diffuse Angle on aerodynamic,and the relationship between aerodynamic and Rear-diffuser Angle is summarized in this paper.The flow around the blunt body is analyzed and discussed for detail understanding the effect of the Rear-diffuser Angle to aerodynamic.Passenger vehicle is a typical blunt body,the flow near these types of vehicle markedly influence their aerodynamic characteristics.Over the past several decades,many investigations of the flow around these vehicles have been carried out on the upper-rear region.Ahmed et al.performed an experimental study of the effects of base slant angle of a hatchback shape on the time-averaged properties of the flow.They proposed a wake vortex system for hatchbacks.Subsequently,Nouzawa et al.investigated the flow structure of the notchback type vehicle.They structured a flow pattern for notchbacks with no rear diffuser slant Their results indicated that the aerodynamic drag could be increased by generation of the trailing vortex at the trunk-deck and the so-called arch vortex behind the backlight These studies improved our understanding of the influence of the Rear-diffuser Angle on the aerodynamic performance.

关键词： aerodynamic fluid rear-diffuser angle PHOENICS cfd analysis

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Brief Clarification of Hydrodynamic Mechanisms of Rudder Fin...