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At first, numerical simulation are made on the temporal developing gas-phase mixing layer where the convective mach number is in the region of subsonic(0.5) and transonic(0.8). For the temporal problem where Mc is 0.5, researches where the computational field contains different numbers of initial disturbances(so-called n period problem) are made respectively, and vortex's types of evolution in mixing layer including different numbers of initial disturbances are investigated; For the temporal problem where Mc is 0.8, the distinct shock let structure is obtained, and its mechanism is analyzed at the same time.

文中首先对对流马赫数为亚声速(0.5)、跨声速(0.8)的时间发展单气相混合层作了数值研究,对Mc为亚声速单气相时间发展混合层,分别研究了计算域包含不同数目的初始扰动周期问题,考查了不同周期数的混合层中涡的不同演化方式;对Mc为跨声速的单气相时间发展混合层,得到了清晰的小激波结构,同时分析了小激波的形成机理。

A streamline method was employed to solve this model instead of the traditional fini.

用流线方法求解该模型,在结合边界元方法确定复杂边界条件下稳态渗流场流线分布的基础上,对流管内的一维渗流问题求解。

Thus, non-negative property is suggested as the criterion of stability. Further, diffusion coefficient is replaced by an artificial one in the finite difference equation to simulate the entropy generation can improve the accuracy of the numerical analysis.

在尽可能满足对流扩散过程数值格式中的输运性或守恒性及稳定性的同时,以扩散熵产仿真为原则的伪扩散系数可有效地提高数值模拟的仿真性,为数值计算中扩散系数的修正提供了一种有效的手段。

Thus LES is proved to be suitable to simulate the flow and temperature fields of large scale vortices with complex geometric boundaries. LES cooperated with the second order full extension ETG finite element method is applied to simulate the forced convection heat transfer around two square cylinders arranged side by side. While the boundary conditions are symmetrical, the time history and power spectrums of drag coefficient, lift coefficient, averaged Nusselt number at the wall, and the streamwise velocity and temperature on the symmetrical points are calculated. The results show that the power spectrums are all almost symmetrical.

应用大涡模拟与二阶全展开ETG有限元离散格式相结合的方法对间距比为1.5的条件下横掠并列双方柱强制对流换热问题进行了数值模拟,通过边界条件对称时,对并列双方柱对称点上的速度和温度以及方柱的阻力系数、升力系数和壁面平均Nu数进行的时域分析和频域分析,得到了在对称边界条件下并列双方柱对称点上的速度和温度以及方柱的阻力系数、升力系数和壁面平均Nu数的功率谱均基本对称的结论。

These initial successes spawned much interest in fluidization.

这些初始的成功引起对流态化的很大兴趣。

The driving force of this self-assembly procedure is capillary force and the water droplets play the role as template.

孔径的尺寸可在1微米到10微米之间控制,形成多孔结构的驱动力是Marangoni对流效应和水平毛细管力。

A fuzzy neural network method is used to monitor and to diagnose fouling on convection heating surfaces.

将模糊神经网络方法应用于对流受热面的灰污诊断和监测,给出了一种模糊神经网络的网络结构、推理算法和训练算法。

In this paper,a space fractional differential equation is considered.The equation is obtained from the advection-diffusion equation by replacing the second order derivative in space by a fractional derivative in space of order.

考虑空间分数阶微分方程(即在一个标准的扩散-对流方程中,用分数阶导数代替空间二阶导数),给出了该分数阶微分方程的显式和隐式有限差分格式。

Thus the data of the earth spheroidal and toroidal free oscillation can be used to explore the 3-dimensional structure(density structure ,velocity structure) or anisotropy of the earth and help to disclose the convection mode in the whole mantle or in the upper mantle.

因此地球自由振荡信息可用于揭示地球的三维不均匀结构信息或各向异性信息,并可能对区分地幔对流模式有所帮助。

The numerical model based on energy conservation equation, takes into account of Gauss distribution, in space and time of laser spot, the finite size of sample, the temperature dependence of physical thermal properties, and the surface heat losses due to convection and radiation.

计算模型在能量平衡方程的基础上,将入射的脉冲激光在时间与空间上的分布以Gauss分布考虑,同时考虑工件尺寸、工件材料热物理性质及对流辐射造成的表面热损失等对温度场的影响。

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