| 二维三温流体力学计算中时间步长的自动控制 |
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| 引用本文： | 符尚武,戴自换,邬吉明.二维三温流体力学计算中时间步长的自动控制[J].计算物理,2005,22(6):515-519. |
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| 作者姓名： | 符尚武 戴自换 邬吉明 |
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| 作者单位： | 北京应用物理与计算数学研究所,计算物理实验室,北京,100088 |
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| 基金项目： | 国家自然科学基金(10271019)，CAEP科学技术基金，国防科技重点实验室基金资助项目 |
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| 摘 要： | 研究了二维三温流体力学计算中时间步长的控制问题,提出了控制时间步长的多种约束条件:既考虑了显式流体力学离散方程的CFL(Courant-Friedrichs-Lewy)条件,又考虑了隐式三温能量方程温度的相对变化,还考虑了Lagrange网格密度(或体积)的相对变化以及三温能量方程的迭代次数等.在计算过程中这些约束条件可以随时自动地改变时间步长,以最经济和合理的时间步长完成计算.最后给出了数值实验结果.
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| 关 键 词： | 二维三温 流体力学计算 时间步长控制 |
| 文章编号： | 1001-246X（2005）06-0515-05 |
| 收稿时间： | 2004-07-01 |
| 修稿时间： | 2004-10-25 |
Automatic Control of Time Step in Two-dimensional Three-temperature Hydrodynamic Calculations |
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| FU Shang-wu,DAI Zi-huan,WU Ji-ming.Automatic Control of Time Step in Two-dimensional Three-temperature Hydrodynamic Calculations[J].Chinese Journal of Computational Physics,2005,22(6):515-519. |
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| Authors: | FU Shang-wu DAI Zi-huan WU Ji-ming |
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| Institution: | Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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| Abstract: | The time step control in two-dimensional three-temperature hydrodynamic calculations is studied.Based on numerical stability and accuracy we propose several conditions that restrict the time step.These conditions change the time step automatically in computation so that the calculation proceeds with the most economical and reasonable time step.Numerical results are shown to demonstrate the efficiency of the method. |
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| Keywords: | two-dimensional three-temperature hydrodynamic calculations time step control |
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