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density stratification
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  密度分层
     According to exploration seismic sounding data,density stratification wag fixed forgravity anomalies along the Fenghuang-Chaling geoscieroe section. The section density model wasessablished with the help of variable density horizontal trapezoid body,ac th6 calculated theoretical anomalies are coincideal with the measured Bouguer gravity anomalies.
     对凤凰─茶陵地学断面重力异常,根据爆炸地震测深资料,确定密度分层,用变密度水平梯形体构制剖面密度模型,计算理论重力异常和实测布格重力异常吻合较好。
短句来源
     A sound analysis of velocity distributions of steady,uniform water sediment mixture flows in open channels is presented based on mass and momentum conservation laws. The shear stress due to sediment particle particle interactions and the buoyancy effects due to density stratification are considered respectively through the mixture′s constitutive relationship and an adapted Monin Obukhov length scale. Excellent performance of the developed model is demonstrated through comparison with measured data.
     基于水沙混合流的基本控制方程,考虑泥沙颗粒间相互作用形成的剪切应力,引入局部化MoninObukhov长度尺度以计入密度分层浮力效应,建立了明渠定常、均匀水沙混合流流速分布的严格理论模式,理论结果与实测资料吻合甚好,该模式普遍适用于低含沙量和高含沙量流动.本文的分析支持基于VonKarman常数不变之观点
短句来源
     In the two-dimensional wind tunnel, systematic experimental researches were carried out on the phenomenon of reverse transition on a heated plane with stable density stratification.
     针对加热平板表面密度分层结构中的逆转捩现象,在二元风洞中进行了系统的实验研究。
短句来源
  密度分层结构
     In the two-dimensional wind tunnel, systematic experimental researches were carried out on the phenomenon of reverse transition on a heated plane with stable density stratification.
     针对加热平板表面密度分层结构中的逆转捩现象,在二元风洞中进行了系统的实验研究。
短句来源
  “density stratification”译为未确定词的双语例句
     Firstly, the concept of local area is brought forward, and the method of subtracting local averaged density stratification is used in the numerical schemes of baroclinic pressure gradient terms in σ coordinate, which can improve the calculation precision of baroclinic pressure gradient.
     具体包括:提出局域的概念,设计了σ坐标系扣除局域平均密度层结的斜压梯度力计算方法,提高了σ坐标系斜压梯度力计算精度;
短句来源
     The application of the spin separating technology has two necessaryconditions: one is that the mixture flow must has pressure energy, the other is that between thetwo-phase mediums must has density stratification;
     应用水力旋流分离技术应具有两个必要的条件:一是混合物流必须具有压力能,二是两相介质之间必须存在密度差温度较高;
短句来源
     In this thesis we consider a viscous instability that is a modified form of the familiar Tollmien-Schlichting (T-S) waves by stable density stratification.
     在本文中,我们考虑稳定分层流体中一种类似T-S波的粘性不稳定波。
短句来源
     However,the horizontal pressure gradient force estimation is problematic over steep topography and density stratification areas in sigma coordinate model. The artificial pressure gradient error may create artificial flow.
     但在地形变化剧烈,尤其在密度层结效应明显的海域,σ坐标模式中的水平压强梯度力误差会引起伪密度流。
短句来源
     Some examples are given,showing that density stratification can have a large effect on the added mass and damping of the floating rectangular box in a two-layer fluid over a range of frequencies.
     对所建立的求解模型进行了数值计算分析,结果表明在矩形箱浮体的某个振荡频率范围内,流体的分层效应对其附加质量和阻尼系数有显著影响的。
短句来源
  相似匹配句对
     STRATIFICATION AND DENSITY ADJUSTMENT IN CALCULATION OF LATERAL HETEROGENEITY
     横向密度不均匀计算中的分层与密度调整
短句来源
     The polarization of concentration difference and the stratification of electrolyte density
     浓差极化与电液浓度分层
短句来源
     Density "Experiment
     密度的实验
短句来源
     Density (calc. )
     计算密度D_(calc.)
短句来源
     On Social Stratification
     社会分层论
短句来源
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  density stratification
The effect of thermal boundary conditions and density stratification on the appearance of convection in the atmospheres of plane
      
The effect of the density stratification of the atmosphere on the structure of the thermal during its motion is analyzed, and relations describing the characteristic points of the thermal and the smearing of its leading edge are obtained.
      
The vertical displacement of the water particles relative to the equilibrium position is obtained in the form of a series in terms of waves modes for a given density stratification.
      
The fine structure of thermoconvective flow near an inclined- plane heat source within a fluid with a stable density stratification due to salinity gradient is investigated using optical and probe techniques.
      
In the axisymmetric case the geostrophic vortex is qualitatively analyzed on the basis of a numerical calculation of integral representations of the hydrodynamic fields for a fluid with an exponential density stratification.
      
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A theoretical formula of amplitudes of internal waves generated by even-paddle wave-makers, , is derived under the condition of linear'density stratification, where m is an odd number and 2m is the mode number. When A, N and ω are constants, the amplitude ratio of mode 2m to mode 2(m+2) is a2m/a2(m+2)=(m+2)2/m2. The theoretical results are examined by laboratory experiments performed in a small long tank using a mode 1-and-mode 2 paddle wave-maker designed by authors. The agreement is reasonable. The weakness...

A theoretical formula of amplitudes of internal waves generated by even-paddle wave-makers, , is derived under the condition of linear'density stratification, where m is an odd number and 2m is the mode number. When A, N and ω are constants, the amplitude ratio of mode 2m to mode 2(m+2) is a2m/a2(m+2)=(m+2)2/m2. The theoretical results are examined by laboratory experiments performed in a small long tank using a mode 1-and-mode 2 paddle wave-maker designed by authors. The agreement is reasonable. The weakness of the theory is that it can hot predict the amplitudes with even number m.

本文在线性分层条件下应用二维分层流方程导得了偶板造波机生成内波的理论振幅公式,即a_(2m)=2Ak_(2m)[1-(-1)~m]l_(2m)~(-1)(πm)~(-2),此公式表明偶模态即m为奇数时,对应的内波模态为生成模态。它改进了[1]的理论公式。当A、N及ω不变时,相邻生成模的振幅比为a_(2m)/a_(2(m+2))=(m+2)~2/m~2。在自制的小型内波实验水槽中,用1、2模态联合造波机验证了上述公式,结果表明理论和实验基本吻合。理论公式的不足之处是尚不能预报当m为偶数时的偶模态内波振幅。

An experimental investigation on turbulent mixing and density stratification of flows which result from the merging of two layers of flow with temperature difference(or with salinity difference, or with both temperature difference and salinity difference) was conducted in detail, and a mathematical model for density stratified flow is suggested. In the paper, some experimental results and computational results are reported. The experimental results show that within the scope of flow investigated,...

An experimental investigation on turbulent mixing and density stratification of flows which result from the merging of two layers of flow with temperature difference(or with salinity difference, or with both temperature difference and salinity difference) was conducted in detail, and a mathematical model for density stratified flow is suggested. In the paper, some experimental results and computational results are reported. The experimental results show that within the scope of flow investigated, major factors which influence the mixing are the velocity ratio (V_2/V_1) and density Froude number(F_0), critical condition of stratification stability can be dcscribed by a simple formula about V_2/V_2 and F_0, and it is not related to the Reynolds number(Re). The comparison between computation results and experimental results shows that the present model can be used to simulate temperature stratified flow and salinity stratified flow correctly. According to the structure of model, it can be believed that the present model reflects the feature of anisotropic turbulence and the interaction between stratification and turbulence reasonably.

本文介绍了冷热水汇合、盐淡水汇合及含盐冷热水汇合流动的部分试验结果,并建立了用于模拟分层流的数学模型。实验结果表明,在所研究的流动范围内,流速比(V_2/V_1)和密度弗劳德数(F_0)是影响两股流体掺混的主要因素,密度分层流稳定的临界条件可用F_0和V_2/V_1的简单关系式表示,与雷诺数R_e没有直接的关系。数值模拟结果与实验结果的比较表明,所建立的数学模型能正确地模拟温度分层流和盐度分层流。从模型的结构可知,本模型较好地反映了各向异性紊流特征及分层与紊动的相互影响等。

Based on the fundamental equations of geophysical fluid dynamics and the consequence of vertical density stratification, this research applies travelling wave coordinate to the 3-D Boussinesq fluid to study the nonlinear permanent wave. An autonomous system of ordinary differcntial equations in two variables is obtained as follows:Rigorous study of the mathematical mechanics of the geometric topological structures in phase plane led to the conclusion that nonlinear wave is periodic in propagation direction...

Based on the fundamental equations of geophysical fluid dynamics and the consequence of vertical density stratification, this research applies travelling wave coordinate to the 3-D Boussinesq fluid to study the nonlinear permanent wave. An autonomous system of ordinary differcntial equations in two variables is obtained as follows:Rigorous study of the mathematical mechanics of the geometric topological structures in phase plane led to the conclusion that nonlinear wave is periodic in propagation direction and that solitary waves do not exist.Further researches showed the travelling wave system can be transformed into a simpler form by using the Hamilton function and "action-angle" variables so that the complex nonlinear wave was simp1ified into a system like simple harmonic vibration.Using the transformed form of nonlinear wave and the directional angle of travelling wave, the analytic solution of nonlinear inertia-gravity internal wave can be written in the form

根据地球流体力学基本方程组,在密度垂直层结的情况下,引进行波坐标,研究非线性定形波在相平面上的几何拓扑结构。严格论证了不存在定形孤立波,并通过Hamilton函数及其角作用变换把行波系统化成最简形式,由此而得到非线性惯性重力内波的解析解。

 
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