查询词典 fluid dynamics

Double-skin facade ; wind tunnel test ; wind load ; peak factor ; probability distribution ; computational fluid dynamics

国家自然科学；双层幕墙；风洞试验；风荷载；峰值因子；概率分布；计算流体动力学

Power-law Rheological model and RNG k-ε turbulence model are used to simulate the Flow Field in Hydraulic Poppet Valve for drilling fluids, which are based on Computational Fluid Dynamics Approach.

本文基于计算流体力学方法，采用幂律流变模型和 RNG k -ε湍流模型对钻井液锥阀阀口处的内部流场进行数值仿真计算。

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve.

采用RNG k-ε湍流模型、动网格技术以及用户自定义程序，对往复泵泵阀的启闭过程进行了非定常数值仿真，得出了不同弹簧因素下、阀门从开启到关闭的过程中，阀芯的升程随时间的变化规律、阀的迟滞关闭时间以及阀芯落座的瞬时速度。

Residential quarantine period space ; numerical simulation ; ventilation system ; computational fluid dynamics

居家隔离空间；数值模拟；通风系统；计算流体力学

This study considers the effects of ventilation system using the residential facilities to the transmission mechanism of indoor aerosol in the residential quarantine period space for infective diseases. This study focuses on the effect of the design of ventilation system on the internal flow field and the removal of contaminant pollution. A computational fluid dynamics software-FLUENT 6.2 is employed to simulate the internal airflow field of the residential quarantine period space. The Carbon dioxide (CO2) is adopted as the index of contaminant source. Three layouts of ventilation system are simulated and the airspeed field, the temperature distribution, and the contaminant distribution are analyzed to find the best ventilation system for the residential quarantine period space.

本研究考虑传染性疾病在居家隔离空间使用一般家用环境控制设备时对室内的气悬感染会有何影响，本文主要分析不同通风设计时对居家隔离空间内部气流之影响，并将国内外现有的规范设计方式做一系列之比较以供参考，并以商用套装软体FLUENT6.2分析居家隔离空间内部流场分布情形，模拟中以二氧化碳（CO2）作为病患所呼出含有病菌空气的指标，模拟案例分为三种主要的通风模式，并分析速度、温度与污染物浓度分布情形，以得到最佳的居家隔离空间通风配置方式。

The efficiency of mass transfer in 60% fraction of hole is higher than in 40% fraction of hole. When gas/liquid ratio is lower 10, the efficiency of mass transfer in new sieve baffle tray is higher than in traditional tray.A three-dimensional quasi-single phase computational fluid dynamics program with the RNG- turbulence model is presented for evaluating the performance of the new sieve baffle tray. The special feature of this model is taking into account the influence of heat transfer during the mass transfer and the influence of mass transfer in computing the flow field.

建立了以RNG模型为基础的三维拟单相流模型，该模型与其它研究者所建立的模型的最大进步是，前人在塔板流场的计算中没有考虑传质的影响，并且在传质过程中没有也没有考虑传热对传质产生的影响，实际上在传质过程中，抛开传热来计算和研究传质是不准确的，因为在传质过程中伴随着传热，并且传热和传质是互相影响、互相制约的，本文所建立的传热与传质模型，把传热和传质进行了有效的藕合。

Computational fluid dynamics methods were applied to obtain the static velocity distributions in the main stage channel of the valve with different structure parameters or different pressure and flow rate.

应用流场数值模拟技术，在不同结构参数、压力、流量等条件下，对先导式纯水溢流阀主阀流道内的流场流态进行动态仿真。

Thermal stratification is important to design and research of launch vehicle liquid oxygen tank, in the paper a numerical investigation was performed for physical field of three-dimensional tank based on computational fluid dynamics technique to depict the temperature distributions and velocity fields.

热分层是新型运载火箭液氧贮箱设计及研究的重点问题，本文采用计算流体力学技术对液氧贮箱内部物理场进行三维数值模拟，揭示了贮箱内部温度场及速度场的分布规律。

Based on the method of Computational Fluid Dynamics,the mathematical models of plate type and tube type of indirect evaporative cooler have been established.

基于计算流体力学方法，建立了板式和管式间接蒸发冷却器的数学物理模型，通过三维数值模拟得到了换热器一、二次空气通道的速度场、温度场和浓度场的分布。

The system for a Huabei type three-span experimental greenhouse was evaluated using a computational fluid dynamics model.

具体的工作如下：在均匀的单相系统中，热量的传递有导热，对流和辐射三种基本形式。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。