共查询到19条相似文献,搜索用时 78 毫秒
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使用计算流体动力学、传热学、固体弹性力学和光学的多物理场耦合集成仿真分析技术完成了红外热像仪中光机的热特性与热设计研究.采用有限单元法(Finite Element Method,FEM)和计算流体动力学(Computational Fluid Dynamics,CFD)得到了光机内部的温度场、应力变形分布及光学件面形... 相似文献
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计算流动显示技术(CFI)在自然对流流场测量中的应用 总被引:1,自引:0,他引:1
计算流动显示(CFI)技术通过利用仿真光测实验中光束的运动规律与光学干涉测量方法的数学模型,并根据计算流体动力学(CFD)的结果,获得仿真的光学干涉图像。本文通过计算机模拟数字散斑干涉中激光光束的运动规律得到了封闭方腔中空气自然对流的CFI光学图像,并将此仿真光学图像与实验得到的图像进行对比,指导实验的进行和自然对流中测试参数的计算。 相似文献
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在风力机流场及其气动性能分析中,计算流体动力学(CFD)方法已受到越来越广泛的关注。近年来出现的致动模型,以在流场中添加体积力源项的形式模拟风力机与三维流场之间的相互作用,极大简化了CFD计算的网格前处理过程、降低了三维CFD计算的网格数量,为大尺度风场的工程计算提供了有效途径。本文研究了致动模型中体积力源项的分布形式,以前期建立的黏性无黏耦合模型为基础构建了新型致动体模型。该模型基于黏性无黏耦合模型提供的压力分布,在叶片真实的三维几何表面布置体积力源项,从而在源头上降低了致动模型所引入的体积力源项分布误差,提高了现有致动模型对叶片三维几何形状的计算精度。 相似文献
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A CFD model was developed to describe the particle laden gas flow through an ESP, particle charging and collection. The corona discharge was modeled using the open source software OpenFOAM to solve the Poison and charge conservation equations, and results were entered using user-defined field functions in the commercial CFD software STAR-CCM+. The gas flow, EHD flow, particle charging and dynamics were modeled using STAR-CCM+. The developed CFD model allows for direct solution of the drift and diffusional flux of gas ions. The influence of the various ESP dimensions, operating parameters and ash properties on the collection efficiency are reported. 相似文献
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Fluent数值模拟在制冷与空调领域中的应用 总被引:1,自引:0,他引:1
Fluent软件是流体力学中通用性较强的一种商业CFD软件,应用范围很广。主要介绍Fluent在制冷与空调中的应用。Fluent模拟适用于制冷领域等现代技术对过程模拟的要求,同时满足现代化生产设计,是制冷与空调设计的一个重要发展方向。阐述了Fluent模拟仿真在制冷领域的现状及发展概况;重点对Fluent在工艺过程中的模拟作了介绍。利用模型复现实际系统中发生的本质过程,并通过对系统模型的实验来研究存在的或设计中的系统。 相似文献
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随着计算机技术的飞速发展,计算流体力学(CFD)越来越广泛地应用于各个领域。通过CFD对复杂流动问题进行研究,能够较精确地反映流场的流动情况。利用CFD技术对夹套冰温库内的流场进行了稳态数值模拟,分析了夹套冰温库内流场的分布情况,讨论了该库体结构下不同送风速度对库内流场均匀性的影响。研究表明,具有夹套结构的冰温库,库内流场分布均匀,采用顶部静压箱送风,底部四周回风的送回风方式,能够使库内形成自上而下的均匀活塞流,不同送风速度对冰温库内流场的影响很小。研究结果证明数值模拟能较好地反映现实情况。 相似文献
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Abstract
In this study, a fully coupled fluid–structure interaction (FSI) software system for a pulsatile flow across a moving tilting-disc valve with clearance is developed. Unsteady pulsatile flow coupled with induced valve motion has been examined in details. State-of-the-art computational fluid dynamics (CFD) methods are adopted in the present flow solver development. To account for nonstationary valve motion, the meshes surrounding the valve are generated and updated in each time-marching step using hybrid grid method. A single-degree-of-freedom rotational valve model is integrated simultaneously with the CFD adaptive time-stepping. It is found in the present study that, on both side of the occluder, strong shedding vortices occur and persist in the valve closing phase. These closure vortices show great influence on the prediction of the regurgitate flow characteristics and the subsequent valve opening dynamics as well. Based on the present software system, the results obtained from quasi-steady simulations performed at various instants of interest with prescribed valve motion are critically evaluated to assess whether simplified flow and valve conditions may lead to erroneous conclusions. 相似文献19.
A number of investigators have tried to develop a generalized prediction method for flow-generated noise produced by in-duct elements in a ventilation system. Most of these prediction methods relied on limited data obtained from conventional measurement techniques that require the use of an expensive and specially combined acoustic and aerodynamic experimental facility. An alternative to using a specialised and aerodynamic facility that is currently gaining favour in building engineering is using computational fluid dynamics (CFD) software packages. CFD is a powerful design tool that is able to predict the behaviour of fluid flow regimes. With the aid of CFD, Mak and Oldham have developed a predictive technique that is based on the relationship between the acoustic power radiated, due to the interaction of air flow and a spoiler, and the turbulent kinetic energy generated in the region of the spoiler. Based on the results of CFD simulation of relevant configurations, the technique has been adopted to normalize the published experimental data of Nelson and Morfey, who produced a normalized spectrum for predicting the sound power level of flow-noise produced by the strip spoilers in a rectangular air duct. In this paper, the theoretical basis of this technique was reviewed and revised. A collapse of data from the simulation models were obtained against the experimental data of Oldham and Ukpoho. The data collapse for a damper were generally excellent at most Strouhal numbers. The data collapse for an orifice plate were generally excellent at lower Strouhal numbers but was less efficient at higher Strouhal numbers where considerable scatter was observed. 相似文献