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对流项的
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  convection term
     Third order upwind difference scheme is applied to convection term to reduce the effect of numerical viscosity.
     采用三阶迎风差分格式离散控制方程中的对流项,克服了原VOF方法中对流项的差分格式精度低于二阶存在数值粘性,在一定程度上掩盖了实际物理粘性影响的缺陷。
短句来源
     Let Ω be a bounded domain with C2 boundary Ω in RN(N ≥ 3), for the more general nonlinearity, the new change of variable transforms the problem of explosive solutions with a negative convection term into the equivalent Dirichlet problem. He exposes that the explosive solutions have the lowest speed.
     设Ω是RN(N≥3)中的C2有界区域,对带负对流项的情形,对更广泛的非线性项,构造一种新型的非线性变换将爆炸解问题,转化成等价的带奇异项的Dirichlet问题,应用极大值原理得到了爆炸解问题解的最小爆炸速度.
短句来源
     THE ASYMPTOTIC OF THE UNIQUE CLASSICAL SOLUTION TO A SINGULAR DIRICHLET PROBLEM WITH A CONVECTION TERM
     带对流项的一类奇异Dirichlet问题唯一古典解的渐近行为
短句来源
     For a positive convection term, he constructs explosive supersolution u and explosive subsolution u satisfying u ≤ u in Ω and obtain the existence of explosive solutions for the problem.
     而对带正对流项的情形,对更广泛的非线性项,构造爆炸上下解u和u在Ω上满足u≤u,得到了爆炸解u的存在性且在Ω上满足u≤u≤u.
短句来源
     Three order differential scheme is used in the computation of convection term and two layers turbulence model are employed in the calculation.
     对流项的计算采用三阶迎风差分格式,使用了两层湍流模型并直接计算了主附体壁上的压力分布.
短句来源
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  convection terms
     EXISTENCE AND ASYMPTOTIC BAHAVIOR OF EXPLOSIVE SOLUTIONS FOR NONLINEAR ELLIPTIC PROBLEMS WITH CONVECTION TERMS
     带对流项的非线性椭圆型问题爆炸解的存在性与渐近行为
短句来源
     3. Three spatially discrete schemes about the convection terms of the N-S equations: the centered difference with artificial viscosity by Jameson, the van Leer scheme of flux vector splitting, and the Roe scheme of flux difference splitting are studied respectively.
     3.研究了N-S方程组中对流项的三种空间离散格式:改进的Jameson中心+人工粘性格式、通量矢量分裂类van Leer格式和通量微分分裂类Roe格式。
短句来源
     2. The spatially discrete schemes about the convection terms of the N-S equations: the centered difference with artificial viscos by Jameson, is studied.
     2.研究了N-S方程组中对流项的改进的Jameson中心+人工粘性格式。
短句来源
     Secondly, the usual methods dealing with the convection terms were introduced and the complete pressure correction algorithm (CPC) was mainly presented to solve the coupling between pressure and velocity. The advantages and disadvantages of CPC, momentum interpolation(MI) and SIMPLE method based on staggered grid system were depicted.
     概述了有限体积法处理对流项的常用方案,重点描述了近年来为解决速度与压力耦合问题而提出的基于非交错网格(或同位网格)的完全压力校正算法(CPC),并与同样基于非交错网格动量插值算法(MI)以及传统的基于交错网格的SIMPLE(Semi-implicitMethodforPressure-linkedEquations)算法进行了比较。
短句来源
     The three-dimensional strongly swirling turbulent flow in a cyclone separator with a volute inlet was simulated to optimize the design by improving the pressure-strain generation and convection terms isotropization of production and convection +wall reflection model of the Reynolds stress equation in FLUENT 6.0. Good agreement was obtained between the predictions and experiments in the separation space and the dust hopper.
     为优化旋风分离器设计,将改进了Reynolds应力方程压力应变项的产生项和对流项的各向同性化模型与壁面效应模型结合,加入到FLUENT6.0软件平台上,对蜗壳式旋风分离器内三维强旋湍流流动进行了数值模拟。
短句来源
  “对流项的”译为未确定词的双语例句
     In this paper,We study the source-type solutions of the initial value problem for non-Newtonian filtration equation with absorption and convection:where p > 2, q > 0 and bi (s) ∈ C1 (R).
     本文研究的是如下含有吸收项和对流项的非Newton渗流方程初值问题解的存在性:其中p>2,q>0且b_i(s)∈C~1(R)。
短句来源
     A Cauchy Problem of Porous Medium Equations with Nonlinear Absorptions and Convections
     具有非线性吸收和对流项的多孔介质方程的一类Cauchy问题
短句来源
     For the singular diffusion equation, namely, m < 1, a = 0, we prove the global existence and blow-up of solutions respectively by considering the eigenvalue problem of the elliptic equation.
     对不含对流项的奇异方程(*),即m<1,的情形,我们利用椭圆特征值问题的一些结果,得到了解整体存在和blow-up问题的条件。
短句来源
     In this paper we discusses the existence and uniqueness of weak solutions to the cauchy problem with some Radon measure on R N as it initial trace for a class of general filtrations equations with strongly nonlinear sources and convections.
     讨论具强非线性源和对流项的一般渗流方程以RN中某一Radon测度为初始迹的Cauchy问题弱解的存在唯一性.
短句来源
     FINITE DIFFERENCE-STREAMLINE DIFFUSION METHOD FOR QUASI-LINEAR SOBOLEV EQUATIONS
     带有对流项的拟线性Sobolev方程的差分-流线扩散法
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  convection term
Stability-Controllable Second-order Difference scheme for convection term
      
Three order differential scheme is used in the computation of convection term and two layers turbulence model are employed in the calculation.
      
e., a non-standard inverse heat conduction problem with convection term which appears in some applied subject are given.
      
A third-order accurate finite element upwind scheme is used to discretize the convection term in the FENE dumbbell equations for the configuration tensor.
      
Using uniform estimates for the linearized system with a convection term, we get global well-posedness in a functional setting invariant with respect to the scaling of the associated equations (in space dimension N≧3).
      
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  convection terms
Film condensation on a sphere is numerically analyzed, taking into account inertia and convection terms.
      
In the numerical treatment, third-order upwind difference scheme was applied to the convection terms of the RANS equations in order to reduce the effect of numerical viscosity.
      
Only part of the convection terms are calculated; these are found to be much smaller than the correction due to the pure Coulomb interaction.
      
The linear part involves diffusion-convection terms and periodic coefficients.
      
The full boundary layer equations for the liquid film and the vapor-gas mixtures (including liquid inertia and energy convection terms) are solved implicitly with appropriate liquid-mixture interface conditions.
      
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This paper deals with the cause-of heat increase in the lower atmosphere in Hai-Cheng region prior to the earthpuake.By means of the temperature tendency equation, each item of heating factors has been Considered. The vertical velocity item's (convection item) value was-8.6℃/day, -3.8℃/day, on 3rd and Eeb, respectiely in the 1000rob to 970mb level, The radiation item's value was3.9℃/day, 3.3℃/day on and 4th Fev. respectively, The horizotal transport item's value was 0.43/day, -0.8℃/day on 3rd and 4th. Feb. respectively....

This paper deals with the cause-of heat increase in the lower atmosphere in Hai-Cheng region prior to the earthpuake.By means of the temperature tendency equation, each item of heating factors has been Considered. The vertical velocity item's (convection item) value was-8.6℃/day, -3.8℃/day, on 3rd and Eeb, respectiely in the 1000rob to 970mb level, The radiation item's value was3.9℃/day, 3.3℃/day on and 4th Fev. respectively, The horizotal transport item's value was 0.43/day, -0.8℃/day on 3rd and 4th. Feb. respectively. The latent heat item's value was Very small. The Sensible heat value (flux of sensible heat at atmosphere bottom ), was calculated from the temperature tendency equation inversely; it seemed to be 7.4℃/day, 3.8℃/day on 3rd and 4th respectively. But the odeservations of the mean air temperture at 1.5m height in Hai-Cheng region showed that it appeared above the average ground temperature during the half period of lst—4th. Feb. It hinted that during the half period the sensible heat was transported from atmosphere to t-he ground. Thenet sensible heat transport was near zeros.The result shows that the heating mode of the lower atmosphere prior to the earthquake is Veery different from traditional heating (conduct, eddy transport) It may be concerned with the pollution of gases which overflowed out of ground prior to theearthquake.

本文提出了震前低层大气的增温原因,利用温度倾向方程,考虑了每一项加热因子。铅直速度项(对流项)的值为-8.6°/天(3日)、-3.8℃/天(4日),位于地面至970毫巴的薄层内,辐射项分别为+3.9℃/天、+3.3℃/天,水平输送项,+0.43℃/天,-0.8°/天,潜热项很小。感热项(下垫面感热通量)是从倾向方程中倒算出来的,似乎分别是7.4℃/天,3.8℃/天。然而平均气温的观测表明,在1—4日的一半时间内高于平均地温。它意味着一半时间内感热输送是从大气输向地面,感热的净输送为零。这个结果表明震前低层大气加热非常不同于传统方式(热传导、涡流扩散),它似乎与地气污染有关,是震前地下所逸放出来。

This paper presents a numerical technique for calculating the steady turbulent flow of a incompressible fluid around the stern of body of revolution and its wake by using a streamline iteration method. The turbulence model used is a two-equation (K-ε) model devoloped by Harlow and Nakayama. In this numerical calculation, however, there are some features:1) The convection terms of governing equations for total pressure, turbulent kinetic energy and its dissipation rate in turbulent flow are written in the form...

This paper presents a numerical technique for calculating the steady turbulent flow of a incompressible fluid around the stern of body of revolution and its wake by using a streamline iteration method. The turbulence model used is a two-equation (K-ε) model devoloped by Harlow and Nakayama. In this numerical calculation, however, there are some features:1) The convection terms of governing equations for total pressure, turbulent kinetic energy and its dissipation rate in turbulent flow are written in the form of the variations of tlvese variables along streamlines, and for static pressure the radial pressure gradient equation is used. In this form, these equations can be more eonvienicntly be dealt with in numerical calculation. 2) By means of a system of coordinate transformations, the external flow field extending to infinity in both radial and axial directions is transformed into an internal flow field within a finite region. Therefore, free-stream condition and parabolic flow condition may be used on the outer boundary and downstream boundary repectively. The boundary layer flow and potential flow outside can be resolved by an uniform system. 3) Assumptions for a thin boundary layer and partially parabolic flow, etc. are not needed.A numerical example is gaven to show the fair agreement between the theoretical predition by the present method and experimental results.

本文提出一种利用流线迭代法计算回转体尾部和尾流的定常、不可压缩湍流流动的数值方法。采用Harlow-Nakayama提出的两方程(K-ε)湍流模型。在数值计算上.1)把湍流流动中的总压,湍动能和它的耗散率方程中的对流项写成这些量沿流线变化的形式,静压采用径向压力梯度方程。2)用坐标变换,把径向和轴向都延伸至无穷远的流动区域变换到有限区域内,在外边界可使用自由来流条件,边界层流动和层外的势流流动可用统一的方程组求解。3)没有部分抛物型和薄边界层等种种近似假定。计算实例表明,理论预测和试验结果吻合。

A two-dimensional laterally integrated numerical model has been developed to represent the velocity and salinity distribution along an estuary.The governing equations which express the conservation of mass,momentum and salt or heat content,are solved by a finite diffrence method in combination with spline functions.The influence of the con-vec tive terms on the resulting distributions of velocity and salinity has been evaluated.The model has been applied to the estuary of the Great Whale River and the Little...

A two-dimensional laterally integrated numerical model has been developed to represent the velocity and salinity distribution along an estuary.The governing equations which express the conservation of mass,momentum and salt or heat content,are solved by a finite diffrence method in combination with spline functions.The influence of the con-vec tive terms on the resulting distributions of velocity and salinity has been evaluated.The model has been applied to the estuary of the Great Whale River and the Little Whale River in the James Bay region.Results of the simulation have been presented together with comparison of some observational data.The sensitivity of the model to various values of the stratification parameters that influence vertical diffusion has been studied and some preliminary results presented.The use of the cubic spline formulation in computation hydraulics has been found to be promising and warrants further development.

本文为描述速度和盐度沿河口的分布规律,而发展了二元横向积分的数值模型。表示质量守恒、动量守恒和含盐量或热容量的主管方程,采用样条函数和有限差分方法相结合进行求解。估计了对流项对速度和盐度分布的影响。 本模型已应用于詹姆斯湾(Jams Bay)区域的大鲸河(the Great Whale River)河口和小鲸河(the Little Whale River)河口的环流计算。本中介绍了模拟结果,并与现有实测数据作了比较。研究了计算模型对影响垂直扩散的不同层化参数值的敏感性,提供了一些初步结果。 在计算水力学中采用三次样条公式,证实是有前途的,值得进一步发展。

 
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