An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna

• Published in: Applied thermal engineering 2019-02, Vol.148, p.907-928
• Main Authors: Favre, F., Antepara, O., Oliet, C., Lehmkuhl, O., Perez-Segarra, C.D.
• Format: Article
• Language: English
• Subjects: Antennas; Aparells i instruments; Automobile industry; Automotive antenna; Automotive electronics; Automotive engineering; Boundary conditions; Calor; Computational fluid dynamics; Computer simulation; Conjugate heat transfer; Conjugates; Cooling electronics; Deformation mechanisms; Dinàmica de fluids computacional; Electronic apparatus and appliances; Electronic components; Electrònica; Finite element method; Fluid dynamics; Fluid flow; Física; Heat; Heat exchange; Heat flux; Heat transfer; Immersed boundary method; Industrial applications; Simulation; Termodinàmica; Thermal management; Transmission; Transmissió; Àrees temàtiques de la UPC
• ISSN: 1359-4311; 1873-5606
• DOI: 10.1016/j.applthermaleng.2018.11.099

•We present a monolithic methodology for the CFD simulation of cooling electronics.•The IBM was extended to include the radiation exchange between surfaces.•The implementation was verified by several simulations of benchmark cases.•The thermal behavior of a car component was studied simulating some configurations. Considering that the most common reason for electronic component failure is the excessive temperature level, an efficient thermal management design can prolong the operating life of the equipment, while also increasing its performance. Computational Fluid Dynamics and Heat Transfer (CFD&HT) have proved valuable in the study of these problems, since they can produce reliable fields of fluid flow, temperature and heat fluxes. Moreover, thanks to the recent advances in high-performance computers, CFD&HT numerical simulations are becoming viable tools to study real problems. The conventional approach, which consists of employing body-conformal meshes to the solids and fluids regions, often results costly and ineffective in applications with very complex geometries and large deformation. For these cases, an alternative approach, the Immersed Boundary Method (IBM), which employs a non-body conformal mesh and discretizes the entire domain using a special treatment in the vicinity of the solid-fluid interfaces, has proven more effective. In this work, an IBM was extended to simulate problems with conjugate heat transfer (CHT) boundary conditions taking into account the radiative exchange between surfaces. It was designed to work with any type of mesh (domain discretization) and to handle any body geometry. The implementation was validated and verified by several simulations of benchmark cases. Moreover, the IBM was applied in an industrial application which consists of the simulation of a Smart Antenna Module (SAM). All in all, the carried out studies resulted in a monolithic methodology for the simulation of realistic situations, where all three heat transfer mechanisms can be considered in complex geometries.