In the case of large density difference, there is a velocity separation between different media, making the measurement more difficult, cross-correlation method is still usable.
在密度差别较大时，存在着不同介质间的速度分离，给相关法测量带来困难。
This article introduced the basic theory and method of measuring the velocity of light using the method of phase difference and how to measure the velocity of light using phase difference in air.
介绍了一台自制的利用相位差法测量光速的仪器的基本原理和方法，并通过对光在空气中的传播速度的测定，使大家对用相位变化测量光速仪器有所了解。
The comparison of the calculation time between the streamline simulation technique and the finite difference method also confirms that streamline simulation technique has better simulation velocity.
在流线模拟技术与有限差分方法运算时间的比较中，也证实流线模拟技术具有更快的运算速度。
We have established the continuity equations under train pipe leakage condition and presented an explicit finite difference method to solve the pressure-velocity coupling equations.
建立了考虑列车管泄漏的连续性方程，给出一种求解压力速度耦合方程的显式有限差分算法。
Ultrasonic wind velocity measurement with time-difference method and wind velocity measurement system based on ARM micro-controller were introduced.
介绍了超声波时差法风速测量的基本原理，以及基于ARM微控制器的风速测量系统的实现方法。
According to calculate method, the paper analyzed the influencing factors about heterogeneity, including velocity difference, proportion difference, interval length, buffer time.
以异质性计算模型为依据，分析运行图异质性的影响因素，包括不同速度差、不同列车比例、区间长度、天窗类型、缓冲时间等。
It is theoretically shown that the application of high-order difference method in structure and velocity images decreases frequency dispersion error, but improves effect and accuracy of computation...
理论分析表明，在构造与波速成像中采用高阶差分方法，可以减小频散误差、提高计算效率与计算精度、获得满意的效果。
The velocity distribution in the oil ducts is estimated by network method and temperature distribution in the winding is estimated by the finite difference method.
文中介绍了用网络法计算油流槽道内速度分布与用有限差分法计算线饼内温度分布。
This paper introduced the flow measuring principle of time-difference method of ultrasonic flow meter and the flow calculating method in flow measurement with velocity instrument.
论述了流速仪法测流及水轮发电机组现场效率试验的原理和计算方法。
Second, the free-boundary is handled by using combination of the zero-velocity method with the general ghost-image method and fourth-order difference format is used in free-boundary.
然后采用将零速度法和广义虚像法相结合的方法来处理自由边界，并在自由边界上采用四阶精度差分格式；
Second, the free-boundary is handled by using combination of the zero-velocity method with the general ghost-image method and fourth-order difference format is used in free-boundary.
然后采用将零速度法和广义虚像法相结合的方法来处理自由边界，并在自由边界上采用四阶精度差分格式；
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