Compact CFD Modeling of EMC Screen for Radio Base Stations: A Porous Media Approach and a Correlation for the Directional Loss Coefficients

• Published in: IEEE transactions on components and packaging technologies 2007-12, Vol.30 (4), p.875-885
• Main Authors: Anton, R., Jonsson, H., Moshfegh, B.
• Format: Article
• Language: English
• Subjects: Base stations; Circuit boards; Computational fluid dynamics; Computational modeling; Directional loss coefficients; Electromagnetic compatibility; Electromagnetic compatibility (EMC) screen; Electromagnetic modeling; Flow control; Flow pattern; Flow uniformity; Fluid dynamics; Kinematics; Kinetic energy; Loss measurement; Parametric study; Porous materials; Porous media; Predictive models; Pressure control; Pressure drop; Printed circuit boards; renormalization group (RNG); Reynolds number; Studies; TECHNOLOGY; TEKNIKVETENSKAP; Viscosity
• ISSN: 1521-3331; 1557-9972; 1557-9972
• DOI: 10.1109/TCAPT.2007.910065

A methodology to obtain the directional pressure loss coefficients in a porous media model of an electromagnetically compatible screen of a radio base station model is presented. The directional loss coefficients of this compact model are validated against a detailed computational fluid dynamics model not only by comparing the total pressure drop, but also by evaluating the flow pattern after the screen. The detailed model was validated in an earlier article by the authors. A parametric study is conducted for 174 cases. Seven parameters were investigated: velocity, inlet height, screen porosity, printed circuit board (PCB) thickness, inlet-screen gap, distance between two PCBs and screen thickness. Based on the compact model parametric study, two correlations for the directional loss coefficients are developed as a function of the Reynolds number and the above geometrical parameters. The average disagreement between the compact model that uses the directional loss coefficients from the correlations and the detailed model was of 3% for the prediction of the total pressure drop and less than 6.5% and 9.5% for two coefficients that accurately characterize the flow pattern.