PROJECT DETAILS
We executed this project for an electronics manufacturer based in Israel. The client approached us with the initial thermal design of an electronics control box, seeking to evaluate its thermal performance and ensure reliable operation under demanding conditions. Our team performed a comprehensive Computational Fluid Dynamics (CFD) analysis to study airflow patterns, heat dissipation, and temperature distribution within the enclosure. The simulation helped us identify critical thermal hotspots and areas where heat accumulation could affect the performance and reliability of electronic components. Leveraging our domain expertise in electronics cooling, we optimized the heat sink design, incorporated heat diffusers at critical locations, and fine-tuned the overall thermal configuration to improve heat transfer and temperature uniformity. We also conducted thermal analysis under worst-case operating conditions to validate the design's thermal performance and identify potential risks. Through this simulation-driven approach and targeted design improvements, we helped the client achieve a more thermally optimized design, mitigate overheating risks, and enhance confidence in the product's thermal reliability before deployment.
3D CAD MODEL
The rack unit comprises five PCB assemblies integrating several major heat-generating components, including hybrid couplers, power amplifiers, DC-to-DC power supplies, and harmonic filters. These components contribute to the overall thermal load of the system, with localized heat generation varying according to their power dissipation and operating conditions. To manage the heat generated by high-power-density components, local heat sinks are incorporated at critical locations to facilitate effective heat transfer. At the overall system level, cooling is achieved through three exhaust fans, supported by a louver arrangement that enables air circulation through the rack enclosure and assists in removing the accumulated heat. The 3D CAD model provided by the client was reviewed and simplified to meet the requirements of CFD analysis. Non-essential geometric details were removed while preserving the key features influencing airflow and heat transfer, including the PCB layouts, major heat-generating components, heat sinks, fan locations, and louver openings. This geometry preparation helped establish a computationally efficient model while retaining the essential characteristics required to evaluate the rack unit's thermal performance.
CFD MESH
A high-quality poly-hexcore CFD mesh was generated for the simplified 3D CAD model, comprising approximately 20 million computational cells. The mesh was designed to capture the internal geometry of the rack enclosure, PCB assemblies, heat sinks, fan regions, and louver openings, which significantly influence airflow and heat transfer. The poly-hexcore meshing approach provides a balance between computational efficiency and solution accuracy. Local mesh refinement was applied around critical heat-generating components, heat sink fins, and regions with significant airflow variations. The resulting mesh enabled detailed evaluation of airflow patterns, pressure distribution, and temperature variations throughout the rack unit under the specified operating conditions.
CONCLUSIONS DRAWN FROM CFD ANALYSIS RESULTS
The fan operating point was initially estimated through a series of preliminary CFD iterations to establish a realistic representation of the airflow conditions within the rack enclosure. Key input parameters, including component heat dissipation rates, thermal junction resistances, and other critical thermal boundary conditions, were reviewed and fine-tuned during the simulation process to achieve realistic and reliable results. Post-processing focused on evaluating key thermal and fluid-flow parameters, including airflow distribution, flow development, pressure drop, heat flux contours, and temperature contours. These results provided insights into the system's cooling effectiveness and helped identify potential thermal hotspots and areas for improvement. Based on the simulation results, a few minor design recommendations were proposed to further enhance thermal performance. Following the implementation of these recommendations, the CFD analysis confirmed that the overall thermal design was satisfactory, with all electronic components and the system operating within their respective manufacturers' specified upper temperature limits under the analysed conditions.
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