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artificial dissipation
相关语句
  人工耗散
     In order to increase the computation efficiency, artificial dissipation, variable time step and enthalpy damping acceleration techniques are used in the five-step Runge-Kutta time stepping.
     在定常的计算中,采用5步Runge-Kutta时间推进,引进人工耗散,应用了当地时间步长、焓阻尼等加速收敛技术。
短句来源
     Finally, numerical experiments are carried out to weigh the influence of the artificial dissipation coefficient a and the pseudo-compressibility coefficient ε.
     另外,本文也对人工耗散系数和人工可压缩系数对数值计算的影响进行了实验。
短句来源
     The symplectic algorithm has no artificial dissipation,and keeps stability of the energy error.
     辛算法无人工耗散,能较好保持能量误差的稳定性;
短句来源
     Ooscillating near the shock wave is eliminated by introducing artificial dissipation;
     引进人工耗散项以克服中心差分固有的奇偶不关联性和抑制激波附近解的振荡;
短句来源
     To overcome thedisadvantages of pseudo-compressibility algorithm, four-order artificial dissipation term is added to the right of the differential equation, and the recommended formula is offered for the choice of the artificial dissipation coefficient ε.
     为了克服人工可压缩方法可能带来的数值振荡,本文在离散方程的右端显式添加四阶人工耗散项,并就人工耗散系数的选取给出了推荐公式。
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  人工粘性
     The main numerical method of this code is coming from scheme (Jameson, Schimit and Turkel): using cell-centered finite volume method as spatial discretization tools, and a system of ordinary differential equations for time variable is obtained, which is solved by utilizing five-step Runge-Kutta scheme as time marching method , introducing artificial dissipation to damp high frequency oscillations near the shock and stagnation point.
     本论文采用欧拉方程作为控制方程,利用中心有限体积法进行空间离散,得到对时间变量的常微分方程组,采用龙格库塔多步法进行时间积分,加入人工粘性以消除激波和驻点附近的压力振荡等方法来对NACA0012翼型的实际流动进行并行数值模拟。
短句来源
     To ensure the numerical dissipation much smaller than the physical viscous terms, directional scaling of the artificial dissipation is achieved and proper boundary conditions are also introduced in this term.
     为保证高雷诺数下N-S方程的数值粘性远小于物理粘性,对人工粘性项进行了方向性修正并引入适当的边界条件。
短句来源
     The LU-ADI algorithm is employed in this paper, in order to control the numerical stability, the second-order and fourth-order artificial dissipation are added to the basic algorithm.
     采用LU-ADI格式计算,为提高格式的稳定性在隐式和显式部分分别添加了2阶和4阶人工粘性项。
短句来源
     Finite Volume Method (FVM) is used to calculate the 3-D viscous flow in the vectoring exhaust nozzle. The artificial dissipation and its boundary condition are improved to quicken the convergence and upgrade the precision of the numerical simulation.
     采用有限体积法计算了轴对称矢量喷管三维粘性流场,通过改进人工粘性及其边界条件提高了计算的收敛性和数值模拟的精度。
短句来源
  “artificial dissipation”译为未确定词的双语例句
     The further extension of the method for solving Euler's equations is then presented with five-stage Runge-Kutta time-stepping scheme, studying the artificial dissipation model of unstructured mesh method.
     针对守恒型Euler方程组的无网格离散形式,借鉴非结构网格方法附加耗散模型,采用五步Runge-Kutta显式时间推进格式求解。
短句来源
     There are many ways for artificial dissipation of nature fog, but haven't been used widely because of field operation ineffectiveness and quite high cost.
     目前用于人工消除自然雾影响的方法虽然有很多种,但由于实地操作效果不佳以及成本过高等原因,并未能广泛投入使用。 一九八九年前后,H.
短句来源
     In about 1989, H.Uchiyama and M.Jyumonji tried to remove the influence of natural fog with electricity, and invented a new fog liquifier for artificial dissipation of natural fog.
     Uchiyama和M. Jyumonji尝试用静电方法消除自然雾的影响,相应地研制出一种新的雾滴液化装置用于人工消雾。
短句来源
     The solution of steady flow employs a finite-volume method with the Badwin-Lomax turbulent model, an algebra model, which can' t add the number of the equations and easy to solve. The 4-step Rung-Kutta scheme is adopted and the techniques of artificial dissipation, local time stepping and residual smoothing are used to increase the convergence rate.
     对于定常求解,本文采用格心格式的有限体积法对N-S方程作空间离散,湍流模型采用计算中广泛使用Badwin-Lomax紊流模型,它是一种代数模型,不增加求解方程的数目,计算量相对较小。
短句来源
     The boundary layer temperature and humidity stratification were statistically analyzed using the upper level data and the part of low level data of 58 cold fogs (T≤0℃ when fog forms) in 1981-1996.The results are necessary basis for artificial dissipation of supercooled fog and improvement of forecast level.
     以1981~1996 年58 次冷雾(成雾时T≤0℃)为样本,利用高空和部分低空探测资料,对其边界层的温湿度层结分布特征进行了统计分析。 所得结果不论对人工消除过冷雾的研究还是对提高预报水准都是有益的。
短句来源
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  artificial dissipation
In order to get smooth convergence for transonic, viscous flows, the artificial dissipation has been modified by using the time step for advective and diffusive equations.
      
A modified artificial dissipation based on the time-step limit for convective and diffusive equation has been used for numerical stability.
      
Only a fourth order artificial dissipation has been used here for global stability of the solution.
      
Artificial dissipation terms for finite difference approximations of linear hyperbolic problems with variable coefficients are determined such that an energy estimate and strict stability is obtained.
      
Conservative Finite Difference Formulations, Variable Coefficients, Energy Estimates and Artificial Dissipation
      
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In this paper, many quasi-linear equations are reduced to evolution equations inoperator form It is proved that if the operator A is non-negative, then"strongly implicit (i.e., 1/2 ≤θ≤ 1) schemes" would be absolutely stable, but if the operator A is skew-symmetric, then "weakly implicit and explicit (i.e., 0 ≤θ ≤ 1/2) schemes" are absolutely unstable.Furthermore, taking one dimensional non-linear advection equation as an example, three schemes with non-negative operator A and the corresponding stable schemes...

In this paper, many quasi-linear equations are reduced to evolution equations inoperator form It is proved that if the operator A is non-negative, then"strongly implicit (i.e., 1/2 ≤θ≤ 1) schemes" would be absolutely stable, but if the operator A is skew-symmetric, then "weakly implicit and explicit (i.e., 0 ≤θ ≤ 1/2) schemes" are absolutely unstable.Furthermore, taking one dimensional non-linear advection equation as an example, three schemes with non-negative operator A and the corresponding stable schemes with an artificial dissipation term are designed. A computational example is given. It is shown that the latter schemes are effective for damping false parasitic waves, and suitable for the calculation of problems with discontinuity.

本文把许多拟线性方程归结为算子形式的“发展方程”:F/t+AF=0.证明了带有非负算子A的“强隐式(即1/2≤θ≤1)格式”是绝对隐定的;而带有反对称算子A的“弱隐式和显式(即0≤θ≤1/2)格式”是绝对不稳定的。文中又以一维非线性平流方程为例,具体地构造了具有非负算子A的三种差分格式和相应的带人工耗散项的稳定格式,给出一个计算实例,说明后一类格式对消除虚假的寄生波也是很有效的,适于计算有间断的问题。

Compressible flow around an NACA 0012 airfoil at high angle of attack is numerically simulated by solving the two-dimensional Navier-Stokes equations in a body-fitted system, the grid system is C-type grid generated algebraically. The LU-ADI algorithm is employed in this paper, in order to control the numerical stability, the second-order and fourth-order artificial dissipation are added to the basic algorithm. By using the Baldwin-Lomax turbulent model, the formation of the leading edge separation bubble,...

Compressible flow around an NACA 0012 airfoil at high angle of attack is numerically simulated by solving the two-dimensional Navier-Stokes equations in a body-fitted system, the grid system is C-type grid generated algebraically. The LU-ADI algorithm is employed in this paper, in order to control the numerical stability, the second-order and fourth-order artificial dissipation are added to the basic algorithm. By using the Baldwin-Lomax turbulent model, the formation of the leading edge separation bubble, as well as the convection of vortex along the airfoil surface and unsteady phenomena of vortex are simulated at high angle of attack. For some Mach numbers and angles of attack, the NACA 0012 airfoil turbulent solutions are periodie. By the comparison, the results in this paper agree with experiments and results received by other method.

以求解二维N-S方程数值模拟NACA 0012翼型大攻角状态的可压绕流特性;N-S方程是在贴体坐标系中给出的,以代数方法生成C型网格系统。采用LU-ADI格式计算,为提高格式的稳定性在隐式和显式部分分别添加了2阶和4阶人工粘性项。应用BaldwinLomax湍流二层代数模型模拟了大攻角时前缘分离涡的形成,旋涡对流及其非定常现象。在某些Mach数和攻角下NACA 0012翼型的湍流解具有周期性。通过比较,本文数值计算结果同实验及国外相应的数值计算结果基本吻合。

A technique based on an axisymmetric three-dimensional flow model has been developed for solving a class of subsonic ejector designs,that the primary flow oxygen is supplied via the ejector nozzles is used to develop a secondary flow of exhaust gases which has given off their heat to the Stirling engine heater. The mixing with turbulent confined jets is examined, a computer program has been written to solve the problems of subsonic ejector designs and the axisymmetric Reynolds-averaged Navier-Stokes equations....

A technique based on an axisymmetric three-dimensional flow model has been developed for solving a class of subsonic ejector designs,that the primary flow oxygen is supplied via the ejector nozzles is used to develop a secondary flow of exhaust gases which has given off their heat to the Stirling engine heater. The mixing with turbulent confined jets is examined, a computer program has been written to solve the problems of subsonic ejector designs and the axisymmetric Reynolds-averaged Navier-Stokes equations. Turbulence is modeled using an algebraic turbulence model. An improved finite volume formulation involving a hybrid central/upwind QUICK differencing, fourth-order artificial dissipation,local time stepping and implicit residual smoothing are used. An efficient acceleration technique is developed based on the conservation damping including the enthalpy damping,mass flow damping and the sum of species density fraction damping, show that enhances substantially its computing efficiency.

本文以水下Stirling发动机引射管设计为研究对象,对亚声速受限共轴射流中的两种气体混合过程,用数值模拟方法求解了轴对称雷诺平均N-S方程组。提出的一种改进的显式有限体积法,包括基于网格角点的具有高分辨的中心/迎风QUICK算法,四阶人工耗散、局部时间步长和隐式余数光滑技术的应用。为加速收敛,采用一种类似于总焓阻尼的方法,引入质量流量阻尼和气流中化学组份质量分数阻尼,以快速获得足够近似的解,适合工程设计应用的需求。

 
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