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Experimental Assessment of CFD Predictions of Fascia Performance
Technical Paper
2002-01-0570
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A numerical and experimental investigation was undertaken to assess the accuracy and sensitivity of a commercial CFD code when predicting the effect of changes to a car fascia on radiator airflow. The Fluent CFD software program was used to model the external and underhood airflow for the front half of a car allowing the mass flow rate of air through the radiator to be calculated. These CFD predictions were compared with experimental measurements of radiator Specific Dissipation (SD) made after CFD predictions were completed. Twenty-two cases were run with five different fascias possessing air inlets that varied in size and shape. The experimental and numerical results obtained showed a 98.4% correlation coefficient with standard deviation of 2.1% on the difference between the techniques and a prediction interval of ±4.2%. Fourteen of the twenty-two cases were ranked correctly giving a Spearman Rank Coefficient of 0.992. In addition, three velocity measurements were made at the back of the radiator using a dynamic probe and showed results that agreed with those predicted numerically to within 5% of the freestream velocity. The cooling performance was found to be sensitive to changes in the geometry of the fascia particularly around the upper cooling inlet.
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Authors
- Kristian Johannessen - Vehicle Aero-acoustic Wind Tunnel & Anechoic-Dynamometer Laboratories Department of Mechanical Engineering, Monash University
- Jeffrey Saunders - Vehicle Aero-acoustic Wind Tunnel & Anechoic-Dynamometer Laboratories Department of Mechanical Engineering, Monash University
- John Sheridan - Vehicle Aero-acoustic Wind Tunnel & Anechoic-Dynamometer Laboratories Department of Mechanical Engineering, Monash University
- Dean Niclasen - Holden Ltd
Topic
Citation
Johannessen, K., Saunders, J., Sheridan, J., and Niclasen, D., "Experimental Assessment of CFD Predictions of Fascia Performance," SAE Technical Paper 2002-01-0570, 2002, https://doi.org/10.4271/2002-01-0570.Also In
SAE 2002 Transactions Journal of Passenger Cars - Electronic and Electrical Systems
Number: V111-7; Published: 2003-09-15
Number: V111-7; Published: 2003-09-15
References
- Andra, R. Kumar, K. Hytopoulos, E. Sun, R. 1998 The Effect of Boundary and Geometry Simplification on the Numerical Simulation of Front-End Cooling Society of Automotive Engineers, SAE 980395
- Beier, M. Seider, G. 1999 Numerical Sensitivity study on the prediction of radiator performance using CFD underhood air flow simulation Vehicle Thermal Manangement Systems 4 London, UK
- Capdevila, H. Elias, S. Martinuzzi, R. Surry, D. 1999 Development of Analytical Capabilities for the Design of Integrated Automotive Radiator-Fan Assemblies Vehicle Thermal Management Systems 4 London, UK
- Dib, S. 1997 Parametric Study of the Front-End of Australian Cars and its Effects on Cooling Masters Thesis Royal Melbourne Institute of Technology 1997
- Gillieron, P. Samuel, S. Chometon, F. 1999 Potential of CFD in Analysis Under-Bonnet Airflow Phenomena Society of Automotive Engineers, SAE 1999-01-0802
- Hooper, J.D. Musgrove, A.R. 1997 Reynolds Stress, Mean Velocity, and Dynamic Steady Pressure Measurement by a Four-Hole Pressure Probe Experimental Thermal and Lewis Science 15 375 383
- Lipson, C. Sheth, N.J. 1973 Statistical Design and Analysis of Engineering Experiments McGraw-Hill
- Lin, C. 1999 Specific Dissipation as a Technique for Evaluating Motor Car Radiator Cooling Performance PhD Thesis Royal Melbourne Institute of Technology 1999
- Lin, C. Saunders, J.W. Watkins, S. Mole, L. 1997 Increased Productivity - The Use of Specific Dissipation to Evaluate Engine Cooling Society of Automotive Engineers, SAE 970137
- Lin, C. Saunders, J. W. Watkins, S. 1997 Effect of Cross-Winds on Motor Car Engine Cooling Society of Automotive Engineers, SAE 970138
- Ng, E.Y. Johnson, P.W. Watkins, S. Grant, L. 2000 Wind-Tunnel tests of Vehicle Cooling System Performance at High Blockage Society of Automotive Engineers, SAE 2000-01-0351
- Ono, K. Himeno, R. Fujitani, K. Uematsu, Y. 1992 Simultaneous Computation of the External Flow around a car body and the Internal Flow through its Engine Compartment Society of Automotive Engineers, SAE 920342
- Saunders, J.W. Mansour, R.B. 2000 On-Road and Wind Tunnel Turbulence and its Measurement Using a Four-Hole Dynamic Probe Ahead of Several Cars SAE Paper 2001-01-0350
- Stevens, S. P. Bancroft, T. G. Sapsford, S. M. 1999 Improving the effectiveness of underhood airflow prediction Vehicle Thermal Management Systems 4 London, UK
- Walpole, R.E. Myers, R.H. Myers, S.C. 1998 Probability and Statistics For Engineers and Scientists 6th Prentice Hall
- Williams, J. Vemaganti, G. 1998 CFD Quality - A Calibration Study for Front-End Cooling Airflow Society of Automotive Engineers, SAE 980039
- Yasuki, T. Nishimura, T. Abe, T. Takamitsu, J. 1993 Prediction of the Airflow Through Automotive Radiators Using 3-Dimensional Analysis Society of Automotive Engineers, SAE 932889