This content is not included in your SAE MOBILUS subscription, or you are not logged in.
CFD Simulation of a Real World High-Performance Two Stroke Engine with Use of a Multidimensional Coupling Methodology
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 09, 2008 by SAE International in United States
Annotation ability available
CFD simulation (Computational Fluid Dynamics) is a state of the art tool for the development of internal combustion engines, especially for internal mixture preparation, scavenging process and combustion. Simulation offers an array of information in the early development phase without the need of building a prototype engine. It shortens the development time, reduces the number of prototypes and therewith test bench costs.
In previous investigations [SAE 2005-32-0099] and [SAE 2007-32-0030] a new coupling methodology which bases on the combination of three-dimensional (3D), one-dimensional (1D), and zero-dimensional (0D) CFD calculation has been presented. This methodology uses a new multidimensional interface technology and is able to handle 3D-0D, 3D-1D and 3D-3D connections. The special feature of this methodology is the capability of being placed on any position in the 3D CFD mesh. For instance, reed valve and crankcase are replaced by a 0D model, exhaust pipe by a 1D model and finally all these models are connected with the new interface technology in the 3D CFD mesh. Therefore, this methodology allows the replacement of regions with a high number of 3D cells by fast-calculating 0D or 1D models and therewith reduces computational time. This paper covers the detailed discussion of the above mentioned coupling methodology and its application on a real-world high-performance two-stroke engine. The validation of the methodology is based on a simulation with the CFD-Code FLUENT 6.3. This analysis of a high-performance two stroke engine will be carried out to demonstrate the working of this coupling methodology and it will be compared with a conventional 3D CFD calculation. The main focus lies on the accurateness of results with 3D-3D, 3D-1D and 3D-0D coupling models, their computational time, and handling of the coupling methodology. Also the use of the methodology for a real world development task like the optimization of two-stroke engines will be demonstrated.
CitationJajcevic, D., Almbauer, R., Schmidt, S., and Glinsner, K., "CFD Simulation of a Real World High-Performance Two Stroke Engine with Use of a Multidimensional Coupling Methodology," SAE Technical Paper 2008-32-0042, 2008, https://doi.org/10.4271/2008-32-0042.
- Rothbauer R.J., Margelik H.R., Aslam M.M., Almbauer A.R., Schmidt S.P., Glinsner K.: “Predictive Simulation Strategies for the 2-Stroke Scavenging Process with the Scope of the Development Process”; 20056552(JSAE), 2005-32-0099(SAE), 2005
- Rothbauer R.J., Almbauer A.R., Schmidt P.S., Margelik H.R., Glinsner K.: “A Multidimensional Interface for the Predictive CFD Simulation of the 2-Stroke Engine”; 20066559(JSAE), 2006-32-0059(SAE), 2006
- Rothbauer R.J., Grasberger G., Abidin Z., Almbauer A.R.: „Reed Valve, Crankcase and Exhaust Models Coupled to 3D Fluid Domains fort he Predictive CFD Simulation”; 20076530(JSAE), 2007-32-0030(SAE), 2007
- Schmidt S.P., Winkler F., Schoegl O., Pontoppidan M.: „Development of a Combustion Process for a High Performance 2-Stroke Engine with High Pressure Direct Injection”; 2004-01-2942(SAE), 2004
- Cunningham G. and Kee R.J., Boyall J.: “CFD Prediction of Crankcase Flow Regimes in a Crankcase Scavenged Two-Stroke Engine”; 970361(SAE), 1997
- Chiavola O.: “MULTI-DIMENSIONAL CFD-TRANSMISSION MATRIX MODELLING OF IC ENGINE INTAKE AND EXHAUST SYSTEMS”; Journal of Sound and Vibration, 2002
- Rothbauer J. R. : “Methode zur Koppelung von bewegten 3D sowie 0/1D CFD Berechnungsgebieten”; Dissertation, Technische Universität Graz, 2007
- Schmidt S. : „Auslegung, thermodynamische Analyse and Entwicklung von Zweitakt-Brennverfahren mit Hochdruck-Direkteinspritzung”; Dissertation, Technische Universität Graz, 2005
- Toro E.: „Riemann Solvers and Numerical Methods for Fluid Dynamics”; Springer, ISBN 3-540-61676-4, 1997
- Blair G.P.: “Design and Simulation of Two-Stroke Engines”; Bd. 1. Edition. Society of Automotive Engineers, Warrendale, 1996
- ANSYS Fluent: “Fluent 6.3 User's Guide”; Fluent Inc, 2005
- ANSYS Fluent: “Gambit User's Guide”; Fluent Inc, 2005
- Adair R.P., Qvale E.B., Pearson J.T., “Instantaneous Heat Transfer to the Cylinder Wall in Reciprocating Compressors”, Proceedings of the International Compressor Conference Purdue, USA, 1972
- Bryan J.F., Fleck R., Kee J.R., Thornhill D.: “The Evaluation of Discharge Coefficients in the Cylinders of High Performance Two-Stroke Engines”, SAE 2003.32.0029, JSAE 20034329, 2003
- Chiatti G., Chiavola O.: “Multicode Prediction of the Influence of the Exhaust System on the Performance of a Turbocharged Engine”, Journal of Engineering for Gas Turbines and Power, ASME, 2002
- ANSYS Fluent: “UDF Manual”; Fluent Inc, 2005