An Approximation and CFD Validation in Dashboard Nozzles for Reviewing Demisting and Deicing Issues in Windshields
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 10, 2022 by SAE International in United States
Annotation ability available
Event: Automotive Technical Papers
Windshield visibility for passenger buses is a crucial matter since it is directly related to the safety of the drivers. The fog that forms on the windshield restricts the driver’s visibility and adversely affects driving safety. Due to these concerns, there should be an effective demisting system in every passenger bus. In this study, the performance of the windshield demisting system was investigated in a passenger bus developed by Anadolu Isuzu. The demisting system in the vehicle was examined by performing CFD (computational fluid dynamics) analysis with the software Ansys FLUENT R20 version. Tests were performed on the vehicle with the existing system in order to measure air velocity values and temperatures on the nozzles. Fan boundary conditions in the CFD simulations are applied to entrance of blower, which is a radial fan placed in defroster unit to supply air to windshield. With this method, the flow rate values of the blower and the nozzle outlet velocity values are obtained as outputs of the analysis without modeling the blower in all cases. This method can decrease much more time consumption in these simulations and is used to improve system design with validation of vehicle test and CFD results. In addition, realizable k-ε, SST k-ω with PRESTO in pressure scheme, and SST k-ω turbulence models were compared in the calculations and SST k-ω was found to be the most consistent one.
© ANADOLU ISUZU Otomotiv Sanayi A.Ş.; Published by SAE International. This Open Access article is published under the terms of the Creative Commons Attribution Non-Commercial, No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits use, distribution, and reproduction in any medium, provided that the use is non-commercial, that no modifications or adaptations are made, and that the original author(s) and the source are credited.
CitationÖzcan, O., Yıldız, A., and Coşkun, A., "An Approximation and CFD Validation in Dashboard Nozzles for Reviewing Demisting and Deicing Issues in Windshields," SAE Technical Paper 2022-01-5035, 2022, https://doi.org/10.4271/2022-01-5035.
- Shojaeefard , M.H. , Molaeimanesh , G.R. , Aghamirzaei , N. , Ghezelbiglo , S. et al. Numerical Evaluation of the Defrosting/Defogging Performance of HVAC System in the Main Product of the National Vehicle Platform International Journal of Automotive Engineering 5 2015 2007 2016
- Mehdipour , R. , Baniamerian , Z. , and Saidi , M.H. A New Approach in Developing Optimal Defrost/Demist Performance in a Passenger Car International Journal of Engineering 30 2017 1081 1089
- Yang , W. , Shi , W. , Guo , F. , and Yang , W. Flow Field Simulation and Performance Analysis of HVAC Defrosting Duct 2nd International Conference on Electronic & Mechanical Engineering and Information Technology 2012 https://doi.org/10.2991/emeit.2012.59
- Unverdi , S.O. , Eren , H. , Erdem , V. , Sonmez , N. et al. Technical Note: Optimisation of the Defroster Ducts and Windshield Electric Resistances of a City Bus with CFD Analysis International Journal of Vehicle Design 52 2010 199 221 https://doi.org/10.1504/IJVD.2010.029644
- Barth , T.J. and Jespersen , D. The Design and Application of Upwind Schemes on Unstructured Meshes AIAA 27th Aerospace Sciences Meeting Reno, NV 1989 https://doi.org/10.2514/6.1989-366
- Menter , F.R. Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications AIAA Journal 32 8 1994 1598 1605 https://doi.org/10.2514/3.12149
- Menter , F.R. Zonal Two Equation k-ω, Turbulence Models for Aerodynamic Flows 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference AIAA 1993 https://doi.org/10.2514/6.1993-2906