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Numerical simulation by CFD was carried out to understand the hot current behavior in a tunnel with longitudinal ventilation.It becomes clear that fire source modeling is very important because the hot current behavior is strongly affected by the fire sou
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运用CFD进行数字模拟,以了解纵向通风隧道内热烟气流的特性.通过模拟发现对火源进行模拟非常重要,热烟气流特性受火源位置的影响很大,并且对火源模拟方法很敏感.火源生成的火焰区是燃烧引起的化学反应区域.即使火源附近的木垛排列完好,也很难在考虑这些化学反应条件下模拟热生成区域.建议考虑纵向通风隧道内火焰形状并对它进行数字模拟.模拟结果与试验结果非常吻合.试验证明,在纵向通风隧道内,热烟气流从靠近墙体火源处顺风向隧道中心蔓延.数字模拟结果发现,火灾羽流造成的螺旋上升空气会在墙体和羽流之间形成一个涡流区. |
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Numerical simulation of the quasi-brittle fracture behaviors with the selected models was carried out at local constitutive level.
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在局部本构水平上，采用这些界面裂纹本构模型，对各种载荷工况下材料的准脆性断裂行为进行数值模拟。 |
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Numerical simulation of the steady cavitating turbulent flow in the whole flow passage of a Kaplan turbine has been carried out by using a full cavitation model and a mixture two-phase flow model.
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摘要采用一种完整空化模型和一种混合流体两相流模型，对轴流式水轮机全流道内的定常空化湍流流动进行了数值模拟。 |
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Numerical simulation of two dimensional examples shows the possibility of using this method to reconstruct flow patterns.
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对二维流场的数值模拟例子表明，这种流场重建的方法是可行的。 |
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Numerical simulation results indicate that. (1) Cut-off model and simple damage accumulation model can qualitatively describe some physical essences of spall fracture, but remain apparent discrepancies from the experimental results due to the damage influ
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结果表明：简单最大拉伸应力模型和简单损伤累积模型能定性反映层裂的物理现象，由于忽略损伤对本构的影响，计算结果和实验有偏差，但模型要求参数较少，对于一些精度要求不是很高的工程问题，可以采用；从材料损伤断裂物理本质出发，采用微损伤统计方法得到的NAG模型和封加波损伤度函数模型，能很好地再现实测的自由面速度剖面，数值计算结果与实验吻合很好。 |
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Numerical simulation signal and vibration acceleration signal of a roughing mill main drive speed reduction unit have been decomposed by using empirical mode decomposition algorithm; each component has been carried on spectral analysis.
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摘要运用经验模式分解算法对数值仿真信号及某轧钢厂粗轧机主传动减速机振动加速度信号进行了分解，从而得到若干个基本模式分量，对每个模式分量进行了频谱分析。 |
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Numerical simulations confirm the strategy's validity and feasibility .This strategy provides an effective solution to other nonlinear multivariable control systems as well.
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仿真实验证明，该策略是有效和可行的，并为其他非线性多变数系统的控制提供了有效方法。 |
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Numerical simulations demonstrate that the multi body analytical model can analyze the aeroelastic stability of the tiltrotor aircraft in the helicopter mode.
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数值计算表明：建立的多体动力学模型能够快速分析直升机模式下倾转旋翼机复杂的旋翼／机翼气弹耦合动力学特性。 |
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Numerical solution of differential equations.
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微分方程的数值解。 |
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Numerical solution of second order differential equations.
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二阶微分方程的数值解。 |
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Numerical summaries of the audience that not only describe how many watched or listened, but their reactions including enjoyment interest, attentiveness, and information gained.
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对受众的数字总结.不仅描述了有多少观众/听众,还包括他们对节目的反应(如:高兴,有意思,注意,以及获得信息). |
