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   artificial dissipation 在 力学 分类中 的翻译结果: 查询用时:0.162秒
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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
    The cell-centered symmetric finite volume arithmetic and Runge-Kutta time stepping scheme are performed to solve Euler equation. The two order and four order artificial dissipation is introduced for stability, local time stepping and implicit residual smoothing technique is applied to save computer time.
    在求解Euler方程方面,采用格心格式的有限体积法进行空间离散,四步Runge-Kutta法作时间推进,二阶、四阶人工耗散作为稳定措施,还采用当地时间步长和隐式残值光顺提高收敛速度。
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。
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
  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
  “artificial dissipation”译为未确定词的双语例句
    The Jameson's central scheme with second and fourth order artificial dissipation is used for space discretization and dual time methodology is implemented for time marching.
    空间离散采用Jameson的中心格式附加二阶和四阶耗散的方法,时间推进则采用了双时间步长的方法.
短句来源
    The preliminary results show that the algebraic dynamical algorithm can solve both the problem of losing dynamical fidelity in the numerical calculation of symplectic geometric algorithm and the problem of artificial dissipation in the numerical calculation of the Ronge-Kutta algorithm, and that it can preserve both the algebraic-geometric fidelity and the dynamical fidelity of the dynamical system under a certain expectable and controllable precision.
    初步结果表明,代数动力学算法可以克服辛几何算法的动力学失真和龙格-库塔算法的人为耗散,能在可预期和可控制的精度下兼顾运动学代数-几何保真和动力学守恒律保真.
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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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The new idea of making implicit scheme is developed on the basis of analyzing model equation inthis paper. By putting the above idea into Flux Vector Splitting, an Implicit Flux Vector Splitting(IFVS), which can avoid approximate factorization or block-bidiagonal, is provided to solve the timeaverage Navier-Stokes equations. A single-step three-node upwind difference scheme for vector fluxand central difference approximation for viscous terms are adapted.As a result,IFVS has no two-or-der numerical dissipation...

The new idea of making implicit scheme is developed on the basis of analyzing model equation inthis paper. By putting the above idea into Flux Vector Splitting, an Implicit Flux Vector Splitting(IFVS), which can avoid approximate factorization or block-bidiagonal, is provided to solve the timeaverage Navier-Stokes equations. A single-step three-node upwind difference scheme for vector fluxand central difference approximation for viscous terms are adapted.As a result,IFVS has no two-or-der numerical dissipation or artificial dissipation.It has obvious superiority in aspects of accuracy, robustness and little calculation.In the case of two-dimensional transonic cascade flows, shock wave exactly captured,and results are satisfied.

通过对模型方程的分析,给出了一种新的隐格式构造思想。将它运用到关通量分裂格式中,可得到无近似因子分解、无矩阵运算的高效二阶精度隐式矢通量分裂差分格式,并用来直接求解时间平均Navier-Stokes方程组。数值计算标明:该方法具有精度高、稳定性好、计算量少、收敛快等优点,在平面叶栅跨音流场的计算中,较好地捕获了激波,与实验比较,结果令人满意。

In this paper, the aerodynamic flowfield of a transonic propeller is computed by using the existing code at DLR, named FLOWer which is based on the Jamesons finite volume method and multigrid technique. Several parameters including artificial dissipation coefficients and scaling factor are tested. The computational results are in agreement with experimental data. The calculations obtained are able to capture several important flow features such as the shock waves and blade tip vortices.

Thepredictionofflowfeaturesoverhigh-speedpropelerisaveryinterestingandimpor-tantproblem,whichhasconstantlychalengedmanyaerody...

A hybrid grid is applied for the solution of 3D layer Navier-Stokes equation. The prismatic grid is generated near the wall, and the tetrahedron grid is generated in the other field. Compared with the single mesh, it′s easy to control the number of the viscous-layers′ points, and it can decrease the storage of the calculation which can improve the calculation′s efficiency. A cell-centered finite volume scheme is presented for arbitrary shapes of elements. The flow algorithm solves the time-depended integral...

A hybrid grid is applied for the solution of 3D layer Navier-Stokes equation. The prismatic grid is generated near the wall, and the tetrahedron grid is generated in the other field. Compared with the single mesh, it′s easy to control the number of the viscous-layers′ points, and it can decrease the storage of the calculation which can improve the calculation′s efficiency. A cell-centered finite volume scheme is presented for arbitrary shapes of elements. The flow algorithm solves the time-depended integral form of the equations by a cell-centred, symmetric finite volume spatial discretisation. In order to obtain the real solution, the artificial dissipation is modified. Extensive numerical studies have been performed in order to assess the accuracy of the present approach. Results demonstrate the capability of simulating complex flow fields efficiently and robustly.

用三棱柱 /四面体组成的混合网格求解三维 Navier-Stokes方程 ,在物面附近采用三棱柱网格 ,而其他地方则采用四面体网格。与单一类型网格相比 ,混合网格易于调节粘性层内网格点数目 ,并能减少存储量 ,提高解的效率。Navier-Stokes方程的求解采用有限体积法 ,对人工耗散项进行了改进 ,使得求解的结果更接近真实的物理解。本文对上述方法开展了数值实验研究。结果表明 ,用三棱柱 /四面体组成的混合网格求解 N-S方程是非常有效的。

 
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