This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Thermo-Mechanical Simulations of Rear Lamps with CFD
Technical Paper
2011-01-0109
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A complete methodology for the thermo-mechanical analysis of optical devices for the automotive industry is presented. The objective is to predict the thermal field all over the lamp, highlighting the zones with risk of melting, and the deformations and stresses associated with it. The proposed approach is based on a Computational Fluid-Dynamic (CFD) simulation capable of capturing all the heat transfer phenomena occurring inside and outside the lamp: conduction between different components of the device, natural convection associated with density changes in air (buoyancy effects), and radiation heat transfer. The latter requires a fairly complex modeling strategy in order to provide a satisfactory (and conservative) treatment for the source of power, i.e. the filament, which can be obtained by means of a proper inclusion of transparency. The radiation model is verified according to a theoretical-numerical comparison on a schematic test case; the whole methodology is then validated on a simple prototype of lamp with the aid of experimental investigations. For a more accurate description of the boundary conditions for the lamp, it is possible to include the external environment, on which natural convection arises too. The treatment of unsteady simulations is discussed, with the description of a suitable adaptive timestep algorithm capable of reducing the computational costs and thus keeping the simulation feasible. The whole methodology is finally tested on a complex industrial lamp.
Recommended Content
Authors
Topic
Citation
Cimolin, F., Rabito, M., and Menotti, A., "Thermo-Mechanical Simulations of Rear Lamps with CFD," SAE Technical Paper 2011-01-0109, 2011, https://doi.org/10.4271/2011-01-0109.Also In
Automotive Lighting Technology and Human Factors in Driver Vision and Lighting, 2011
Number: SP-2300; Published: 2011-04-12
Number: SP-2300; Published: 2011-04-12
References
- Langebach, J. Senin, S. Karcher, C. “Experimental study of convection and radiation interaction in a headlight model using pressure variation” Experimental Thermal and Fluid Science 32 521 528 2007
- Sousa, J.M.M. Vogado, J. Costa, M. Bensler, H. Freek, C. Heath, D. “An experimental investigation of fluid flow and wall temperature distributions in an automotive headlight” International Journal of Heat and Fluid Flow 26 709 721 2005
- Moore, W.I. Donovan, E.S. Powers, C.R. “Recent Advances in MSC/PATRAN Pre-Processing Software Allows Modeling of Complex Automotive Lamp Designs” MSC Americas Users' Conference Universal City 1998
- Nolte, S. Eine Methode zur Simulation der Temperatur- und Stromungsverteilung in lichttechnischen Geraten Dr-Ing Thesis Universitat Paderborn 2005
- Fischer, P. “CFD Analysis and Experimental Verification of an Automotive Fog Lamp,” SAE Technical Paper 2005-01-1921 2005 10.4271/2005-01-1921
- Moore, W.I. Powers, C.R. “Utilizing CFD for Thermal Analysis of a Prototype HID Fog Lamp,” SAE Technical Paper 2000-01-0801 2000 10.4271/2000-01-0801
- Okada, Y. Nouzawa, T. Nakamura, T. “CFD analysis of the flow in an automotive headlamp” JSAE Review 23 95 100 2002
- El-Khatib, F. Bielecki, J. Poorman, T. “Design of Experiment Analysis of Thermal Variables that Affect Automotive Lighting CFD Temperatures,” SAE Technical Paper 2006-01-0490 2006 10.4271/2006-01-0490
- Poorman, T. Bielecki, J. Chang, M. Belsare, S. et al. “Automotive Lighting Thermal Performance Prediction Methods,” SAE Technical Paper 2001-01-0858 2001 10.4271/2001-01-0858
- Poorman, T. Bielecki, J. Chang, M. “Methodology to Evaluate Automotive Lamp Venting,” SAE Technical Paper 2003-01-0648 2003 10.4271/2003-01-0648
- Shiozawa, T. Nakanishi, A. Ozawa, T. Oki, T. et al. “Thermal Air Flow Analysis of an Automotive Headlamp - The PIV Measurement and the CFD Simulation By Using a Skeleton Model,” SAE Technical Paper 2000-01-0802 2000 10.4271/2000-01-0802
- Shiozawa, T. Yoneyama, M. Sakakibara, K. Goto, S. Tsuda, N. Saga, T. Kobayashi, T. “Thermal air flow analysis of an automotive headlamp: the PIV measurement and the CFD calculation for a mass production model” JSAE Review 22 245 252 2001
- Moore, W.I. Donovan, E.S. Powers, C.R. “Thermal analysis of automotive lamps using the ADINA-F coupled specular radiation and natural convection model” Computers and Structures 72 1 July 1999 17 30(14) 1999
- Moore, W.I. Powers, C.R. “Temperature Predictions for Automotive Headlamps Using a Coupled Specular Radiation and Natural Convection Model,” SAE Technical Paper 1999-01-0698 1999 10.4271/1999-01-0698
- Moore, W.I. Hilburger, F.K. “Development of a CFD Model for Simulating Headlamp Humidity Clearing,” SAE Technical Paper 2001-01-0861 2001 10.4271/2001-01-0861
- Moore, W.I. Powers, C.R. “Using CFD for Humidity Clearing Simulation of a Composite Headlamp,” SAE Technical Paper 2000-01-1598 2000 10.4271/2000-01-1598
- Poppner, M. Maschkio, T. “Development of a Software Tool for the Simulation of Formation and Clearance of Condensation in Vehicle Headlamps” PAL 2003 - Progress in Automobile Lighting Darmstadt 2003
- Preihs, E. “Automotive Headlamp - Analytic Solution and Measurements of Condensation inside a Headlamp” Nordic COMSOL Conference Copenaghen 2006
- Shiozawa, T. Yoneyama, M. Sakakibara, K. Goto, S. et al. “Analysis of Natural Convection Inside an Automotive Headlamp by Using CFD Temperature Prediction of the Parts by SHT Method,” SAE Technical Paper 2001-01-0860 2001 10.4271/2001-01-0860
- Shiozawa, T. Ohishi, M. Yoneyama, M. Sakakibara, K. et al. “Analysis of Moisture and Natural Convection Inside An Automotive Headlamp By Using CFD,” SAE Technical Paper 2005-01-1449 2005 10.4271/2005-01-1449
- Cimolin, F. Menotti, A. Rabito, M. Vadori, R. “Analisi termo-meccanica contecniche combinate strutturali e CFD del comportamento di un fanale autoveicoli stico in condizioni di prova e di utilizzo” Proceedings of the XXXVII National Congress of AIAS Rome 2008
- Lienhard, J.H. IV Lienhard, J.H. V “A heat transfer textbook” Third Phlogiston Press 2006
- Tritton, D.J. “Physical Fluid Dynamics” Second Oxford Science Publications 1988
- Batchelor, G.K. “An Introduction to Fluid Dynamics” Cambridge University Press 2000
- Siegel, R. Howell, J.R. “Thermal Radiation Heat Transfer” Third Hemisphere Publishing Co 1992
- Sadd, M.H. “Elasticity: theory, applications, and numerics” Second Academic Press 2009
- Star-CCM+ User Guide CD-Adapco 2007
- Ferziger, J.H. Perić, M. “Computational methods for fluid dynamics” Third Springer 2002