212 Hits in 7.4 sec

Extraction and Visualization of Swirl and Tumble Motion from Engine Simulation Data [chapter]

Christoph Garth, Robert S. Laramee, Xavier Tricoche, Jürgen Schneider, Hans Hagen
2007 Mathematics and Visualization  
The simulation data associated with in-cylinder tumble motion within a gas engine, given on an unstructured, time-varying and adaptive resolution CFD grid, demands robust visualization methods that apply  ...  Associated with this process are two important patterns of flow: swirl and tumble motion, which optimize the mixing of fluid within each of an engine's cylinders.  ...  The CFD simulation datasets are courtesy of AVL.  ... 
doi:10.1007/978-3-540-70823-0_9 fatcat:2au5f3srojfsnjojb36oahwetu

Applications of Texture-Based Flow Visualization

Robert S. Laramee, Gordon Erlebacher, Christoph Garth, Tobias Schafhitzel, Holger Theisel, Xavier Tricoche, Tino Weinkauf, Daniel Weiskopf
2008 Engineering Applications of Computational Fluid Mechanics  
Figure 1: The visualization of swirl motion at the inner boundary surface of a combustion chamber from an automotive engine cylinder: (left) geometric flow visualization using streamlines, and (right)  ...  Flow visualization is a classic sub-field of scientific visualization. The task of flow visualization algorithms is to depict vector data, i.e., data with magnitude and direction.  ...  The CFD simulation data sets are courtesy of AVL, Florida State University, and the Swiss Center for Scientific Computing, amongst others.  ... 
doi:10.1080/19942060.2008.11015227 fatcat:mlbm7ssbqregda5onnz5cmw3gm

From Data Chaos to the Visualization Cosmos [chapter]

Chao Tong, Robert Laramee
2019 Computer Graphics and Imaging [Working Title]  
Creating a digital solution to an analogue problem create massive amounts of data. Visualization is a key technology to extract meaning from large data sets.  ...  Data visualization is a general term that describes any effort to help people enhance their understanding of data by placing it in a visual context.  ...  Let's look at some data visualization solutions for CFD data, visualizing the swirl and tumble motion. See Figure 6 .  ... 
doi:10.5772/intechopen.82159 fatcat:b3frup7jdjfxhlbxm2nnt4pnlu

Kalman Filter Effective to Hydrologic Routing?

Yang-Liang Jeng, Rong-Che Chen, Chao-He Chang
2009 Journal of Marine Science and Technology  
To overcome the difficulties on the flow visualization caused by the high-speed motion of a real engine, a transparent water-analogy-simulation system is designed based on similarity analysis and fabricated  ...  This study is to investigate the quality of the tumbling motion, especially for the engine with a bowl-in-piston.  ...  The flow structure extracted from the PIA measurements in this figure show resemblance to the flow visualization result shown in Fig. 2 , which support the proper set-up of PIA in the engine research.  ... 
doi:10.51400/2709-6998.2512 fatcat:jblane6dsjd6zferrlnuh36oge

Numerical Simulation of Multi-chamber Piston Compressed Ignition Engine

Manoj Kumar Sharma, K.P Chandraiah, Gohil Priyank
2014 IOSR Journal of Environmental Science Toxicology and Food Technology  
Both the bulk gas motion and the turbulence characteristics of the flow are important for the performance of C.I engine.  ...  The present work relates to the modification of the C.I engine design for inducing turbulence by squish and tumble flows to improve the combustibility of the combustible mixture.  ...  Fig 1 1 Swirl and Tumble flow in a cylinder. Fig 2 2 squish generation in CI engine.  ... 
doi:10.9790/2402-081242330 fatcat:4s2jmgm7gffvffh3cut6cpz4ze

Interactive cross-detector analysis of vortical flow data

Raphael Burger, Philipp Muigg, Helmut Doleisch, Helwig Hauser
2007 Fifth International Conference on Coordinated and Multiple Views in Exploratory Visualization (CMV 2007)  
In this paper we discuss the application of multiple linked views for advanced vortex investigation in flow data.  ...  Enhanced credibility and combined advantages of several detectors can be achieved by uniting the results of multiple feature detectors in multiple coordinated views.  ...  The cooling jacket CFD simulation dataset is courtesy of AVL List GmbH, Graz, Austria.  ... 
doi:10.1109/cmv.2007.12 fatcat:ihv7xmxpu5cdxmaaocfvpwczz4

Evaluation of the flame propagation within an SI engine using flame imaging and LES

Chao He, Guido Kuenne, Esra Yildar, Jeroen van Oijen, Francesca di Mare, Amsini Sadiki, Carl-Philipp Ding, Elias Baum, Brian Peterson, Benjamin Böhm, Johannes Janicka
2017 Combustion theory and modelling  
This work shows experiments and simulations of the fired operation of a spark ignition engine with port-fueled injection.  ...  A planar flame imaging technique has been applied within the swirl and tumble plane to provide statistical information on the combustion process to complement the pressure-based comparison between simulation  ...  Acknowledgments We gratefully acknowledge financial support by the German Research Council (DFG) through the SFB/Transregio 150 and the Graduate School of Computational Engineering (GSC 233) in Darmstadt  ... 
doi:10.1080/13647830.2017.1343498 fatcat:3abxq5h4fvcyfn33xdd7qrmqxq

Development of a High Performance Natural Gas Engine with Direct Gas Injection and Variable Valve Actuation

Mirko Baratta, Daniela Misul, Jiajie Xu, Alois Fuerhapter, Rene Heindl, Cesare Peletto, Jean Preuhs, Patrick Salemi
2017 SAE International Journal of Engines  
It was concluded that the principal mixing mechanism is the jet-promoted tumble and elliptical swirl motion, and the mixing rate is thereby scaled with absolute time, rather than crank angle degree, and  ...  An injector configuration was designed in order to enhance the overall engine tumble and thus overcome low penetration.  ...  the development of jet-promoted tumble and swirl motion.  ... 
doi:10.4271/2017-24-0152 fatcat:4cvfzmf53jgxhei3zud5jo3pxa

Characterization of the Inlet Port Flow under Steady-State Conditions Using PIV and POD

Mohammed El-Adawy, Morgan Heikal, A. A. Aziz, Muhammad Siddiqui, Shahzad Munir
2017 Energies  
The experiments were carried out on a four-valve, pent-roof Gasoline Direct Injection (GDI) engine head at different valve lifts and with a pressure difference of 150 mmH 2 O across the intake valves.  ...  The current study demonstrates an experimental investigation of the tumble flow structures using Particle Image Velocimetry (PIV) under steady-state conditions considering the central vertical tumble plane  ...  We need also to acknowledge the contribution of Ricardo UK for providing the cylinder head and its characteristics. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en10121950 fatcat:b7xq346ocbcffhb2b7ilmyx3le

Vector Field Editing and Periodic Orbit Extraction Using Morse Decomposition

Guoning Chen, K. Mischaikow, R.S. Laramee, P. Pilarczyk, E. Zhang
2007 IEEE Transactions on Visualization and Computer Graphics  
Furthermore, we describe the application of our periodic orbit detection and vector field simplification algorithm to engine simulation data demonstrating the utility of the approach.  ...  Design and control of vector fields is critical for many visualization and graphics tasks such as vector field visualization, fluid simulation, and texture synthesis.  ...  Fig. 13 . 13 The visualization of CFD data simulating in-cylinder flow through a diesel engine from two viewpoints.  ... 
doi:10.1109/tvcg.2007.1021 pmid:17495336 fatcat:mk6egmbj2ngrhd7kscibpplapa

Effect of Boost Pressure on the In-Cylinder Tumble-Motion of GDI Engine under Steady-State Conditions using Stereoscopic-PIV

Mohammed El Adawy, M. R. Heikal, A. Rashid A. Aziz, S. Munir, M. I. Siddiqui
2018 Journal of Applied Fluid Mechanics  
Ensemble average velocity vectors were used to characterize the tumble flow structure and for the calculation of tumble ratio and average turbulent kinetic energy.  ...  tumble-plane.  ...  /UTP/01/1) and Ricardo UK.  ... 
doi:10.29252/jafm.11.03.28506 fatcat:ikv7chur65h27iyxzbaumqvouq

Flame front analysis of ethanol, butanol, iso-octane and gasoline in a spark-ignition engine using laser tomography and integral length scale measurements

Pavlos G. Aleiferis, Markus K. Behringer
2015 Combustion and Flame  
These authors reported data derived from thermodynamic analysis of pressure traces from explosions in a combustion vessel, typically at 3 bar and 450 K, following the approach of [26] .  ...  Laser Doppler Velocimetry (LDV) data from the same engine [54, 55] were also consulted to assist the discussion.  ...  ACKNOWLEDGMENTS The authors would like to thank Dave OudeNijeweme and Paul Freeland of MAHLE Powertrain, Ltd., UK for financial and technical support. APPENDIX Peters-Borghi Diagram.  ... 
doi:10.1016/j.combustflame.2015.09.008 fatcat:g6lm7czlvbdbflqmxttzfb3q5e

Experimental assessment of the sources of regulated and unregulated nanoparticles in gasoline direct-injection engines

Michele Bardi, Guillaume Pilla, Xavier Gautrot
2018 International Journal of Engine Research  
On the other hand, an increased in-cylinder aerodynamic (e.g. combined swirl-tumble motion) has a positive impact in reducing global particulates number but also causes an increase of the 10-23nm relative  ...  The engine temperature was found to have a significant impact during the entire warm-up phase on the global particulates number (PN) and also on the relative contribution of the 10-23nm range to the total  ...  Authors would like to acknowledge Vincent Ricordeau for the fine work performed in operating the engine and setting up the optical diagnostics. Finally, authors thank Prof. Aizawa and Associate Prof.  ... 
doi:10.1177/1468087418817448 fatcat:xjhalxdzojd2jpwzyg3w7emd7y

On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

Mohammed El-Adawy, Morgan Heikal, A. A. Aziz, Ibrahim Adam, Mhadi Ismael, Mohammed Babiker, Masri Baharom, Firmansyah, Ezrann Abidin
2018 Energies  
Furthermore, POD analysis confirmed the negligible effect of pressure difference and subsequently the effect of engine speed on flow structures.  ...  These data were used to reveal how the physical properties of coherent structures were captured and distributed among the POD modes, in addition to illustrate the difference between subtracting and non-subtracting  ...  Conflicts of Interest: The authors declare no conflict of interest. Energies 2018, 11, 2261  ... 
doi:10.3390/en11092261 fatcat:cznmd5muhjgnzc5yunviqnjrme

Large-Eddy Simulation of in-Cylinder Flows

D. C. Haworth
1999 Oil & Gas Science and Technology  
This article includes: a discussion of LES and how it differs from Reynolds-averaged Navier Stokes (RANS) modeling; motivation for transitioning to LES for in-cylinder flow in IC engines; and quantitative  ...  Abstract Ñ Large-Eddy Simulation of In-Cylinder Flows Ñ Advances in physical models, numerical methods, and computational power together have brought large-eddy simulation (LES) to the point where it warrants  ...  Roberto Verzicco of the Universitˆ di Roma and Dr. David Reuss of the GM R&D Center for permission to reproduce their results, and Drs.  ... 
doi:10.2516/ogst:1999012 fatcat:uo57bb5vbveapkpxpf722k553y
« Previous Showing results 1 — 15 out of 212 results