1、Dell Non-confidential,1,Thermal Simulation Software Introduce Ford Zhang Non-confidential Materials 2010/09/24,Dell Non-confidential,2,First Part Benefit of Thermal Simulation Software,Dell Non-confidential,3,Background: Clock speed/semiconductor density is increasing, electrical devices are dissip
2、ating more heat. Thermal design becomes more and more critical.,Dell Non-confidential,4,Dell Non-confidential,5,Goal of Thermal Design has changed.1. Previous thermal design goal 100 thermal design success 2.Current thermal design goal a. Short Time b. Low Cost c. Optimization,Dell Non-confidential,
3、6,What we can do with CFD/CFD具体能做什么?Design and optimize heat sink散热器设计与优化Design and optimize duct/vent风道/风孔的设计与优化Select and optimize fan风扇的选型与优化Optimize components/system layout器件的布局与优化Predict components tempassumably or comparatively 预测元器件的温度Display for airflow and Temp layout 流场和温度可视化,CFD (Computa
4、tional Fluid Dynamic),Dell Non-confidential,7,Design and optimize Heat sink,Dell Non-confidential,8,Design and optimize duct/vent,Dell Non-confidential,9,Design and optimize duct/vent,Junction Temp. 91.3 C,Dell Non-confidential,10,Junction Temp. 91.3 C,Design and optimize duct/vent,Dell Non-confiden
5、tial,11,Design and optimize duct/vent,Junction Temp. 83.2 C (A drop of 50%!),Dell Non-confidential,12,Select and optimize fan,Dell Non-confidential,13,Optimize components/system layout,Dell Non-confidential,14,Display airflow and Temp layout,Dell Non-confidential,15,Benefit of CFD (Computational Flu
6、id Dynamic),1.Reduce Cost 2.Shorten R&D Life/Cycle 3.Optimize Thermal Design,Dell Non-confidential,16,Conclusion CFD software is an effective thermal design tool.,Dell Non-confidential,17,Second Part Introduce for Icepak&Flotherm,Dell Non-confidential,18,Two kinds of CFD Software1.Flotherm2.Icepak,D
7、ell Non-confidential,19,Dell Non-confidential,20,Dell Non-confidential,21,1.The main difference between Icepak and Flotherm Icepak和Flotherm的最大区别 ICEPAK uses non-construction mesh使用非结构化网格 Flotherm uses construction mesh.使用结构化网格,Dell Non-confidential,22,Dell Non-confidential,23,Dell Non-confidential,2
8、4,Dell Non-confidential,25,Dell Non-confidential,26,Dell Non-confidential,27,Dell Non-confidential,28,Both of two mesh methods are useful for us.这两种网格的CFD方法都可为我所用,Dell Non-confidential,29,2.Solver: Icepak use Fluent5 as solver Flotherm use its own solver Icepak使用Flunt5计算求解器 Flotherm使用自己的专用求解器,Dell N
9、on-confidential,30,3.Flotherm is developed by Design-Class user Flotherm由Design-Class（设计级）分析方法的倡导者所开发 Flotherm is more useful for system thermal analysis Flotherm更适合用于对系统建模分析 Icepak is more fit for components level analysis Icepak做零组件级热分析更有优势,Dell Non-confidential,31,Dell Non-confidential,32,Dell No
10、n-confidential,33,Dell Non-confidential,34,Dell Non-confidential,35,Suggestion: 建议:Use Flotherm do analysis for system用Flotherm来分析系统Use Icepak do analysis for components用ICEPAK来分析热组件,Dell Non-confidential,36,4. Liquid cooling system simulation模拟液冷系统：Hard for Flotherm/Flotherm难度大Easy for Icepak/Icepa
11、k相对容易与便利,Dell Non-confidential,37,冷板,液冷系统,Dell Non-confidential,38,Dell Non-confidential,39,5. IGES用户图形界面 Flotherm is more friendly/Flotherm更人性化 Icepak is not so friendly/ Icepak较弱,Dell Non-confidential,40,Dell Non-confidential,41,Dell Non-confidential,42,6.Tech support技术支持Flotherm has good tech sup
12、port/Flotherm 非常到位Icepak is weak/Icepak 相对较弱,Dell Non-confidential,43,7.Automatic Optimization Flotherm has strong automatic optimization function Flotherm自动优化功能强大 ICEPAKs automatic optimization is not so strong. Icepak自动优化功能相对较弱,Dell Non-confidential,44,Flotherm automatic optimization 自动优化,Dell Non
13、-confidential,45,Icepak automatic optimization自动优化,Dell Non-confidential,46,8. Post-Processing 后处理功能 Both Flotherm and Icepak are strong Flotherm与Icepak都很强大,Dell Non-confidential,47,Post-processing of Flotherm Flotherm的后处理,Dell Non-confidential,48,Post-Processing of IcepakIcepak的后处理,Dell Non-confide
14、ntial,49,Third Part Limitation of Simulation,Dell Non-confidential,50,The shortage of simulation: 1. Bad accuracy(+-5C): 2.Bad reliability and repeatable: 3.Cant cover acoustic factor: 4. Simulation Optimization is comparative value,Dell Non-confidential,51,Dell Non-confidential,52,How to use simula
15、tion well and ensure design accuracy ? 1. In concept/profile/planning phase: We can use simulation to optimize the location of M/B components, system level layout and chassis venting. 2.In Implementation/Deployment phase we need thermocouple to validate pass or fail due to its accuracy.,Dell Non-confidential,53,Thanks! 章飞,
