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Continued Study of the Error and Consistency of Fan CFD MRF Models
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
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The most common fan model to use in commercial CFD software today is the Multiple Reference Frame (MRF) model. This is at least valid for automotive under hood applications. Within the industry, for this typical application, this model is commonly known to under predict performance. This under prediction has been documented by the authors' of this paper in SAE paper 2009-01-0178 and VTMS paper 2009-01-3067. Furthermore has this been documented by S.Moreau from Valeo in “Numerical and Experimental Investigation of Rotor-Stator Interaction in Automotive Engine Cooling Fan Systems”, ETC, 7th European Conference on Turbomachinery, 2007.
In preceding papers a specific methodology of use has been documented and it has been shown that the MRF model under predicts performance for the airflow in a cooling system commonly with 14% in volumetric flow rate. This is for a system dominated by inertial effects. These 14% was shown to apply across fans of different sizes and designs hence illustrating a consistency of the fan model.
In paper 2009-01-3067 a different methodology of use was documented which decreased the under prediction to 8%.
In this paper the study has continued and is now presenting a more successful methodology of use which essentially removes the under prediction of the fan MRF model for most of fan operation, taking it for axial flow conditions within reasonable capabilities of reproducing tested geometry in a simulation environment, i.e. a difference of 0-1% between measurements and simulations.
CitationGullberg, P., Löfdahl, L., Nilsson, P., and Adelman, S., "Continued Study of the Error and Consistency of Fan CFD MRF Models," SAE Technical Paper 2010-01-0553, 2010, https://doi.org/10.4271/2010-01-0553.
- Moreau S. et.al. “Numerical and Experimental Investigation of Rotor-Stator Interaction in Automotive Engine Cooling Fan Systems” ETC, 7th European Conference on Turbomachinery 2007
- Gullberg P. et.al. “3D Fan Modeling Strategies for Heavy Duty Vehicle Cooling Installations -CFD with Experimental Validation” FISITA World Automotive Congress, F2008-12-087 2008
- Gullberg, P. Löfdahl, L. Adelman, S. Nilsson, P. “A Correction Method for Stationary Fan CFD MRF Models,” SAE Technical Paper 2009-01-0178 2009
- Gullberg, P. Löfdahl, L. Adelman, S. Nilsson, P. “An Investigation and Correction Method of Stationary Fan CFD MRF Simulations,” SAE Technical Paper 2009-01-3067 2009