11,131 Hits in 7.0 sec

Evolution and stability of shock waves in dissipative gases characterized by activated inelastic collisions

N. Sirmas, M. I. Radulescu
2015 Physical Review E  
Analysis of the shock relaxation rates and rates for clustering in a convected fluid element with the same thermodynamic history outruled the clustering instability of a homogeneous granular gas.  ...  Previous experiments have revealed that shock waves driven through dissipative gases may become unstable, for example, in granular gases, and in molecular gases undergoing strong relaxation effects.  ...  ACKNOWLEDGMENTS We wish to acknowledge the financial support of the National Science and Engineering Research Council (NSERC) of Canada through a Discovery Grant to M.I.R. and an Alexander Graham Bell  ... 
doi:10.1103/physreve.91.023003 pmid:25768593 fatcat:hra66t4kabailonwqwnrugl7iy

On the stability and dissipation of wall boundary conditions for compressible flows

N. Lamarque, M. Porta, F. Nicoud, T. Poinsot
2009 International Journal for Numerical Methods in Fluids  
Finally, a two-dimensional test case shows the validity of the demonstration in multi-dimensional configurations.  ...  Those observations are first confirmed by one-dimensional simulations and stability matrix analysis of acoustic modes in cavities.  ...  ACKNOWLEDGEMENTS First author was financially supported by Turbomeca-Safran Group and second author's work was part of the fellow training exchange program in the framework of the Marie Curie RTN FLUISTCOM  ... 
doi:10.1002/fld.2060 fatcat:rnmupv2rqng4ne7ca7fbkhvue4

Low-dissipation finite element strategy for low Mach number reacting flows

A. Both, O. Lehmkuhl, D. Mira, M. Ortega
2020 Computers & Fluids  
Later, a technically premixed turbulent flame in a swirl-stabilized configuration is considered. And finally, a turbulent jet  ...  The error of kinetic energy conservation is of order O(δt h k+1 ), thus dissipation is limited. Standard stabilised finite elements are used for the scalars.  ...  Conclusions In this study, we present a low-dissipation finite element scheme for low Mach number flows in the context of large-eddy simulation using an explicit third order Runge-Kutta method in conjunction  ... 
doi:10.1016/j.compfluid.2020.104436 fatcat:qgrjclybobco3ht6sorlnsslau

Analysis of the Aerodynamics in the Heating Section of an Anode Baking Furnace Using Non-Linear Finite Element Simulations

Prajakta Nakate, Domenico Lahaye, Cornelis Vuik, Marco Talice
2021 Fluids  
Therefore, this paper aims to establish the numerical simulation results for the three-dimensional turbulent flow in a single section of an anode baking furnace with a high rate of fuel injection.  ...  The aerodynamics in the furnace influences the emissions due to the high dependence of combustion and radiation phenomena on the mixing characteristics.  ...  As will be discussed later, non-linear finite element solver is utilized in the present study which further requires a better quality mesh.  ... 
doi:10.3390/fluids6010046 fatcat:fad76vocv5fmda6s54wdkfl4by

A Review of Element-Based Galerkin Methods for Numerical Weather Prediction: Finite Elements, Spectral Elements, and Discontinuous Galerkin

Simone Marras, James F. Kelly, Margarida Moragues, Andreas Müller, Michal A. Kopera, Mariano Vázquez, Francis X. Giraldo, Guillaume Houzeaux, Oriol Jorba
2015 Archives of Computational Methods in Engineering  
One well-known weakness of EBG methods is the generation of unphysical oscillations in advection-dominated flows; special attention is hence devoted to dissipation-based stabilization methods.  ...  Numerical Weather Prediction (NWP) is in a period of transition.  ...  The uneven spacing of the element nodes is the major di erence with respect to the definitions derived in previous studies. In this case, the intrinsic time is non-uniform along the element.  ... 
doi:10.1007/s11831-015-9152-1 fatcat:tmjzwcxorfgt5fdcrlf6kb24ny

Analysis of Effect of Thermal Barrier Coating Materials on Efficiency of IC Engines Using 3D Finite Element Method

Durga Raghu Ram Pendyala, Kaarthik V.M, Puviyarasan M
2014 IOSR Journal of Mechanical and Civil Engineering  
Therefore a raise in thermal efficiency of the engine can be achieved.  ...  Further investigations on these results reveal that there is a considerable reduction in heat loss through combustion chamber when TBCs are used.  ...  First, the model is meshed to obtain approximately 200,000 Nodes and 50,000 elements in each case of thermal analysis.  ... 
doi:10.9790/1684-11485358 fatcat:nye4e3cqdbdy3lynhe2q4ybtau

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

Evgenij Strokach, Igor Borovik, Oscar Haidn
2020 Energies  
Multi-element thrusters operating with gaseous oxygen (GOX) and methane (GCH4) have been numerically studied and the results were compared to test data from the Technical University of Munich (TUM).  ...  A 3D Reynolds Averaged Navier–Stokes Equations (RANS) approach using a 60° sector as a simulation domain was used for the studies.  ...  Conflicts of Interest: The authors declare that they have no conflict of interest.  ... 
doi:10.3390/en13195009 fatcat:hjulnhtxfnf7tm6rfcwmikcjra

Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic Instability in a Single-Element Rocket Combustor

Guo Kangkang, Xu Boqi, Ren Yongjie, Tong Yiheng, Nie Wansheng
2022 Frontiers in Energy Research  
This study numerically investigated the thermoacoustic combustion instability characteristics of a scaled rocket combustor based on a hybrid of the Reynolds-averaged Navier–Stokes and large–eddy simulation  ...  The turbulence–combustion interactions were treated using flamelet generated manifold approach. An unstable case was simulated with detailed reaction mechanisms (GRI-Mech 3.0).  ...  Stability Rating Tests for the Length-Optimization of Baffles in a Liquid Propellant Combustion Chamber Using a Pulse Gun. Aerospace Sci.  ... 
doi:10.3389/fenrg.2022.835977 doaj:deb7d7bc0ac2422b952fa853659035dd fatcat:e7f5azgvurbhfc5uegfeow65si

Development of Biodegradable Flame-Retardant Bamboo Charcoal Composites, Part I: Thermal and Elemental Analyses

Shanshan Wang, Liang Zhang, Kate Semple, Min Zhang, Wenbiao Zhang, Chunping Dai
2020 Polymers  
In this study, bamboo charcoal (BC) was used as a substitute filler for bamboo powder (BP) in a lignocellulose-plastic composite made from polylactic acid (PLA), with aluminum hypophosphite (AHP) added  ...  Objectives were to (a) assess compatibility and dispersibility of BC and AHP fillers in PLA matrix, and (b) improve flame-retardant properties of PLA composite.  ...  Acknowledgments: The authors would like to acknowledge Zhejiang University for providing the mixing machine used in this study. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/polym12102217 pmid:32992551 pmcid:PMC7601007 fatcat:vzeq6efurnhave4p45im27xgse

Finite Element Analysis of Piston using Aluminum Alloys on ANYSYS.pdf

Aditya Yadav, Prashant Sagare
Piston is the most important component in an internal combustion engine. The working condition of piston in an internal combustion is so worst.  ...  Due to this combustion of gases in the cylinder the thermal deformation and mechanical deformation causes piston cracks, tortuosity etc.  ...  the maximum combustion pressure, MPa; =5Mpa This value varies from 2Mpa-5Mpa in case of aluminium alloy.  ... 
doi:10.6084/m9.figshare.16778569.v1 fatcat:7p6bzuqnyjcatpkrxsqbi5uf6i

A finite element method for compressible and incompressible flows

Nacer E. El Kadri E., Abdelhakim Chillali
2020 SN Applied Sciences  
For the simulation of advection-dominated flows, a stabilized finite element method based on the Petrov-Galerkin formulation is proposed.  ...  In this study, we present a unified formulation of compressible and incompressible Navier-Stokes equations in the quasi-linear form for primitive variables.  ...  by a stabilized finite element method.  ... 
doi:10.1007/s42452-019-1922-1 fatcat:lmg36gpn45b6fdj35ulnthoh7a

Study on Thermoelectric Conversion and Conjugate Heat Transfer for PCBA by Finite Element Analysis

Lin, Poon, Tu, Chen, Hsu
2019 Applied Sciences  
The thermal radiation effects by TIMs with graphene were also investigated in this study and proven to be useful for the heat dissipation for the LED lamps.  ...  Compared to the experimental data, it showed that the simulation results had a deviation in the range of 3–5% around the main heating source, the light-emitting diodes.  ...  Therefore, this study uses a real case to establish a more accurate numerical simulation method.  ... 
doi:10.3390/app10010197 fatcat:pwq2nzcohbhlne3evbw4if5zcm

Evaluating thermoacoustic properties of heating appliances considering the burner and heat exchanger as acoustically active elements

Naseh Hosseini, Viktor N. Kornilov, Omke J. Teerling, Ines Lopez Arteaga, Philip de Goey
2018 Combustion and Flame  
Introduction 1 Thermoacoustic instabilities are frequently present in lean (par-2 tially) premixed combustion and have been studied for more than 3 a century [1] [2] [3] .  ...  This academic configu-86 ration is representative for the design of a majority of heating ap-87 pliances and is composed of relatively simple elements which have 88 been intensively studied in the past  ... 
doi:10.1016/j.combustflame.2018.01.030 fatcat:m4i4os5pjrhtfi7xvfm4hwrz2u

Inkjet Printed Heating Elements based on Nanoparticle Silver Ink with Adjustable Temperature Distribution for Flexible Applications

Dana Mitra, Robert Thalheim, Ralf Zichner
2021 Physica Status Solidi (a) applications and materials science  
Furthermore, the response time of the heater is only within a few seconds; a reliability study over 72 h resulted in highest stability and endurance with minor fluctuations in the temperature and resistance  ...  As electric cars do not include a combustion engine heating up the inside of the car, heaters in the interior are gaining increasing interest in the industry.  ...  Conflict of Interest The authors declare no conflict of interest. Data Availability Statement  ... 
doi:10.1002/pssa.202100257 fatcat:abfacm7ozrbd3ftya6mq3b775a

Improved Discontinuity-capturing Finite Element Techniques for Reaction Effects in Turbulence Computation

A. Corsini, F. Rispoli, A. Santoriello, T. E. Tezduyar
2006 Computational Mechanics  
Model problems and industrial test cases are computed to show the potential of the proposed methods in simulation of turbulent flows.  ...  In recent years a new class of variational multi-scale (VMS) stabilization (Hughes, comput methods Appl Mech Eng 127:387-401, 1995) has been introduced, and this approach, in principle, can deal with advection-diffusion-reaction  ...  Results The test case is a 2D compressor cascade model with controlled-diffusion blade profile, experimentally studied by Elazar and Shreeve [11] using a two-component LDV system.  ... 
doi:10.1007/s00466-006-0045-x fatcat:5bcdfagkdjd7pbix6y3y3g4u7m
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