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    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。
    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。
    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。
    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。
    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。
    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。
    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.
    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。
    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。
 

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