涡

Firstly, this paper designs a polar coordinate barotropic vorticity equation semi-spectral model and a quasi-geostrophic grid model in order to research the propagation of vortex Rossby waves and tropical cyclone intensity change entirely.

本文首先设计了一个极坐标系正压涡度方程的半谱模式、一个准地转格点模式对涡旋Rossby波传播和热带气旋强度变化进行了较为系统的研究。

The locations and orientations of the Subantarctic Front, the primary Polar Front and Southern ACC Front in the ACC of the Southeast Indian Ocean can be identified more precisely by the current distribution derived from ADCP data than by hydrographic data, because these fronts are usually accompanied by strong currents, although the speed coinciding with the SACCF is less than that of the SAF and primary PF.

在东南印度洋远离海脊和海台的深海盆以及海脊和海台的走向与ACC主轴平行的海域，高涡动能主要由周期大于90天的变化产生。SAF在东南印度洋没有一致的季节变化。

NO2 is not limited by polar vortex,and show low value over the polar region.

NO2并未受到极涡分布的严格限制，在极区维持低浓度区。

Piston-engined aircraft and turboprops have air compressors to maintain cabin pressure.

活塞发动机和涡桨发动机的飞机有压气机来控制客舱的压强。

Alternating current flowing in the primary coil induces eddy currents in the workpiece, causing it to become heated.

当初级线圈中通以交流电时，就会在工件中产生涡电流，使工件变热。

Alternating current flowing in the primary coil induce s eddy currents in the workpiece, causing it to become heated.

当初级线圈中通以交流电时，就会在工件中产生涡电流，使工件变热。

Firstly, based on the method of pressure-velocity coupling introduced by SIMPLE algorithm and a revised method of solving the unsteady equation of stream function and vorticity on uniform grid, a special algorithm called primitive-variable-time-dependent approach is formed in the present study. In this algorithm the Navier-Stokes equation in primitive variable form is solved by using the time-dependent approach on non-uniform staggered grid system. The second-order accuracy finite difference is used for the first and second partial derivatives of all variables of the convective terms and diffusion terms.

首先，本文在SIMPLE算法系列处理速度与压力耦合问题的思路和均匀网格下改进的关于流函数涡量方程的数值求解方法的基础上，将非定常原始变量Navier-Stokes方程的求解推广至非等距交错网格剖分，形成了具有本文特色的原始变量时间推进方法，其中对流项和扩散项中各变量的各阶导数均采用二阶精度公式，包括温度在内的离散方程组采用ADI迭代方法求解。

In order to describe quantitatively their relative contributions, the kinematic vorticity number is introduced and simply defined as cos v, where v is the angle between two eigenvectors containing the shear directions in the principal deformation plane （XZ-plane or ac-plane）.

为了定量说明两者间的相对贡献，提出了运动学涡度这一物理量，并简单地定义为COSv.v是主变形面内两特征方向间的夹角。

The complex unsteady flow is 3 dimensional and protean, also it is one of the most difficult problems in engineering application.

非定常三维复杂流动，如湍流、非定常分离涡，是当今流体力学的疑难问题之一，也是许多工程应用迫切需要解决的问题之一。

According to the distribution of the radial gradient of vertical vorticity component of hurricane, which is calculated with high resolution output from one explicit numerical simulation of a hurricane case, this kind of wave mainly emerges in eye and eyewall.

利用一次飓风过程的精确数值模拟所输出高分辨的资料，计算了飓风中径向涡度梯度的分布，指出这类波动主要存在于眼墙和眼心中。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。