共查询到19条相似文献,搜索用时 78 毫秒
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大涡模拟及其在室内空气流动换热中的应用 总被引:2,自引:0,他引:2
介绍了国内外大涡模拟的亚格子湍流模式和在室内空气流动换热中的研究现状给出了大涡模拟室内空气流动的应用实例。认为大涡模拟有广阔的发展前景。 相似文献
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本文对一个侧壁受定热流作用的通风小室在两种气流组织型式下的混合对流换热情况进行了数值模拟,计算得到了流场,温度场及混合对流条件下室内的换热情况等随雷诺数Ra的变化规律。 相似文献
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办公室空调房间热环境数值模拟研究 总被引:2,自引:1,他引:1
运用k-ε湍流模型对某办公室空调房间气流组织和热舒适性进行了数值模拟,利用有限容积法和SIMPLE算法对微分方程进行离散求解.研究了室内空气龄云图、温度云图、速度矢量图、PMV云图、PPD云图分布规律.模拟结果表明:室内热环境满足健康、舒适、节能等方面的要求.利用TEST0445型多功能测量仪对人员办公区的空气温度、气流速度进行了测量,测量数据与模拟结果基本一致.在空调系统设计阶段,采用CFD技术可预测室内气流组织、热舒适性及为空调系统优化设计方案提供理论依据和科学指导. 相似文献
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应用计算流体力学(CFD)软件FLUENT,采用同一送风工况,不同空调摆放位置,运用k-epsilon湍流模型对普通瑜伽教室夏季室内空气,进行二维温度场、速度场模拟,得到空调的最佳摆放位置,并根据分析结果和实际情况提出优化措施。 相似文献
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盾构管片接头简化数值模拟方法 总被引:1,自引:0,他引:1
由管片组装的盾构隧道衬砌环刚度分布不均,其薄弱环节为管片接头处。管片接头刚度的合理确定对于盾构隧道施工全过程模拟的合理性、地表沉降槽的确定以及土体损失的准确估算至关重要。根据管片接头受力特点及其构造,考虑对管片接头及其附近区域进行刚度修正,而管片其余区域保持原刚度不变,提出管片接头简化数值模拟方法——局部刚度修正法。基于圣维南原理和变刚度梁理论,推导了确定接头刚度的公式,并给出了相关参数的确定方法。结合室内盾构管片接头足尺试验成果,对不同荷载作用下管片接头的变形情况进行了数值模拟及对比分析。研究成果为盾构三维施工全过程的精细化数值模拟分析奠定了基础。 相似文献
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借助流场计算软件PHOENICS,以κ-ε方程为基础,介绍了对东营市某单位职工宿舍加装空调后室内的气流在夏季工况条件下进行的三维模拟计算(速度场),并对结果进行了分析。 相似文献
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The zero-equation turbulence model for indoor airflow applications proposed by Chen and Xu [4] has obtained immense popularity amongst the CFD practitioners in HVAC industry. A uniform turbulent intensity of 10% has been assumed in their model. In this paper, following the analogy of Chen and Xu [4] in deriving the coefficient of their zero-equation turbulence model (0.03874) which is indeed expressed as a function of turbulent intensity, the effect of turbulent intensity value assumed in the model towards the solution accuracy is investigated in this paper. Three indoor airflow cases, i.e. forced convection, natural convection and mixed convection problems are studied. It has been discovered that as the assumed uniform turbulent intensity Ti is reduced, the solution accuracy is significantly improved and the prediction comes closer to those of the two-equation standard k-? model, LES model as well as the experimental data. 相似文献
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The application of three turbulence models—standard k–ε, re-normalization group (RNG) k–ε and RNG-based large eddy simulation (LES) model—to simulate indoor contaminant particle dispersion and concentration distribution in a model room has been investigated. The measured air phase velocity data obtained by Posner et al. [Energy and Buildings 2003;35:515–26], are used to validate the simulation results. All the three turbulence model predictions have shown to be in good agreement with the experimental data. The RNG-based LES model has shown to yield the best agreement. The flow of contaminant particles (with diameters of 1 and 10 μm) is simulated within the indoor airflow environment of the model room. Comparing the three turbulence models for particle flow predictions, the RNG-based LES model through better accommodating unsteady low-Reynolds-number (LRN) turbulent flow structure has shown to provide more realistic particle dispersion and concentration distribution than the other two conventional turbulence models. As the experimental approach to access indoor contaminant particle concentration can be rather expensive and unable to provide the required detailed information, the LES prediction can be effectively employed to validate the widely used k–ε models that are commonly applied in many building simulation investigations. 相似文献
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软土地层管幕法施工三维数值模拟 总被引:3,自引:0,他引:3
对软土地层管幕法施工过程进行了三维数值模拟,得到了施工过程中地表沉降和管幕周围土体的位移变化规律,并同实测结果进行了比较。结果表明:采用D-P模型可以在不考虑土体时变特性的情况下较好的模拟管幕法施工过程。 相似文献