基于CFD的传热结构拓扑优化研究

Research on topology optimization of heat transfer structure based on CFD

中文关键词: 传热  平均温度  （火积）耗散  拓扑优化  数值模拟

英文关键词: heat transfer  average temperature  entransy dissipation  topology optimization  numerical analysis

中文摘要:

      优化高导热材料分布形态是提高电子元件散热性能的有效策略。基于变密度法，以最小平均温度、最小（火积）耗散作为目标函数，以高导热材料体积分数为约束条件建立了传热结构拓扑优化模型，并采用投影技术减小灰度单元过渡区域，通过CFD软件平台对四边中心传热结构及四角传热结构进行拓扑优化研究。结合算例，得到了两种目标函数下高导热材料的最佳散热构型，并对两种优化目标在拓扑优化中的适应性进行了对比分析。研究结果表明，以最小（火积）耗散为优化方法所得到高导热材料的分布形态更加清晰平滑，优化效果更加显著。在各项参数一致的前提下，采用四边中心传热拓扑模型热量传递效率优于四角传热拓扑模型。基于（火积）耗散理论的拓扑优化研究将为后继的传热结构设计等方面提供更加可靠的理论依据。

英文摘要:

      To enhance the thermal performance of electronic components, it is useful to optimize the distribution pattern of high thermal conductivity materials. Based on the variable density method, a topology optimization model of the heat transfer structure was created, with the objective functions being the minimum average temperature and minimum entransy dissipation and the constraints being the volume fraction of high thermal conductivity materials. Additionally, the transition zone of the gray-scale unit was reduced using projection technology, and topology optimization studies of the four-side center heat transfer structure and the four-corner heat transfer structure were completed using CFD software. The ideal designs for highly thermally conductive material heat dissipation under two objective functions were discovered when the mathematical instances were combined, and the adaptability of the two optimization goals in topology optimization was contrasted and examined. The results of the study showed that the distribution pattern of the high thermal conductivity material obtained by taking the minimum of entransy dissipation as the optimization method was clearer and smoother, and the optimization effect was more significant. When all the parameters were consistent, the four-sided center heat transfer topology model performed better in terms of heat transfer efficiency than the four-corner topology model. The entransy dissipation theory-based topology optimization research will offer a more solid theoretical foundation for later areas of heat transfer structure design.