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Prediction of mushy zone permeability of Al-4.5wt%Cu alloy during solidification by phase field model and CFD simulation 被引量:1
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作者 Long-fei Li Rui-jie Zhang +4 位作者 shi-jie hu Dan Zhang Shi-di Yang Chang-sheng Wang Hai-tao Jiang 《China Foundry》 SCIE 2019年第5期313-318,共6页
Liquid permeability of the mushy zone is important for porosity formation during the solidification process. In order to investigate the permeability of the mushy zone, an integrated model was developed by combining t... Liquid permeability of the mushy zone is important for porosity formation during the solidification process. In order to investigate the permeability of the mushy zone, an integrated model was developed by combining the phase field model and computational fluid dynamics (CFD) model. The three-dimensional multigrain dendrite morphology was obtained by using the phase field model. Subsequently, the computer-aided design (CAD) geometry and mesh were generated based on calculated dendrite morphologies. Finally, the permeability of the dendritic mushy zone was obtained by solving the Navier-Stokes and continuity equations in ANSYS Fluent software. As an example, the dendritic mushy zone permeability of Al-4.5wt%Cu alloy and its relationship with the solid fractions were studied in detail. The predicted permeability data can be input to the solidification model on a greater length scale for macro segregation and porosity simulations. 展开更多
关键词 phase field model mushy ZONE COMPUTATIONAL FLUID dynamics PERMEABILITY SOLIDIFICATION
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Performance of an Adaptive Optics System with Dual Deformable Mirrors
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作者 shi-jie hu 《Journal of Electronic Science and Technology of China》 2009年第3期277-280,共4页
One deformable mirror (DM) in conventional adaptive optics system can not meet the needs of large scale and high order aberration compensation. In this paper, a dual DMs way is presented, which needs the decoupling ... One deformable mirror (DM) in conventional adaptive optics system can not meet the needs of large scale and high order aberration compensation. In this paper, a dual DMs way is presented, which needs the decoupling of dual DMs. In dual DMs adaptive optics (AO) system, the decoupling algorithm of dual DMs is deduced. Stroke of one of DMs is large, spatial frequency of the other is high. According to the algorithm, the large stroke DM (LSDM) corrects low order aberration only, and the high spatial frequency DM (HSFDM) corrects other aberration. The experimental result for two 61-DM AO system is presented. The result indicates that the experimental performance of dual DMs AO system is almost the same with that of the conventional AO system using single DM with ideal stroke and equivalent spatial frequency. 展开更多
关键词 Aberration compensation adaptiveoptics decoupling algorithm deformable mirror experimental result
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