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| 1 | LARGE EDDY SIMULATION OF COMPLEX TURBULENT FLOWS:PHYSICAL ASPECTS AND RESEARCH TRENDS显示文摘In the current paper,we have primarily addressed one powerful simu-lation tool developed during the last decades——Large Eddy Simulation (LES),whichis most suitable for unsteady three-dimensional complex turbulent flows in industryand natural environment.The main point in LES is that the large-scale motion isresolved while the small-scale motion is modeled or,in geophysical terminology,pa-rameterized.With a view to devising a subgrid-scale(SGS) model of high quality,wehave highlighted analyzing physical aspects in scale interaction and energy transfersuch as dissipation,backscatter,local and non-local interaction,anisotropy and res-olution requirement.They are the factors responsible for where the advantages anddisadvantages in existing SGS models come from. A case study on LES of turbu-lence in vegetative canopy is presented to illustrate that LES model is more based onphysical arguments.Then,varieties of challenging complex turbulent flows in bothindustry and geophysical fields in the near future are presented.In conclusion,wemay say with confidence that new century shall see the flourish in the research ofturbulence with the aid of LES combined with other approaches. | 李家春 | 2001 | Acta Mechanica Sinica2001，17，4： | 8 |
| 2 | 双相Fe-15Cu-5Al-0.3Y铸态合金及其溅射涂层的高温氧化行为(英文)显示文摘研究了Fe-15Cu-5Al-0.3Y铸态合金及其溅射涂层在800℃,0.1MPa氧气中的氧化行为。铸态合金表面形成的氧化膜分为3层:最外层是一层很薄的CuO层;第二层主要由铁的氧化物组成,而且其中含有一些铜的氧化物和少量的铝的氧化物;而与合金接触的第三层是一层非常薄的Al2O3层,不能给予合金充分的保护。溅射涂层表面形成的氧化膜分为两层:外层由铁的氧化物组成;内层比较复杂,形成了暗黑色的铁和铝的氧化物,同时析出了垂直于合金表面的未氧化的亮色富铜狭条;溅射涂层中发生了一定程度的铁和铝的内氧化;而且在涂层基体下还存在一个铝的内氧化区。合金晶粒尺寸的降低能够有效促进铁的选择性外氧化。 | 向军淮 王为 张洪华 | 2012 | 稀有金属材料与工程2012，41，S2： | 0 |
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