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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。
    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。
    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。
    In order to prevent odd-even decoupling of the solution and oscillations near the shock waves, a blend of adaptive second- and fourth-order artificial dissipation is added.
    引入二阶与四阶相融合的自适应人工耗散项用以克服中心格式固有的奇偶不关联性和抑制激波附近解的震荡。
    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;
    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;
 

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