| 波流环境中射流的大涡数值模拟 |
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| 引用本文： | 徐振山,陈永平,张长宽,王娅娜.波流环境中射流的大涡数值模拟[J].水科学进展,2014,25(2):239-245. |
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| 作者姓名： | 徐振山 陈永平 张长宽 王娅娜 |
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| 作者单位： | 1.河海大学水文水资源与水利工程科学国家重点实验室,江苏南京 210098; |
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| 基金项目： | 国家自然科学基金资助项目（51379072）；高等学校博士学科点专项科研基金资助课题（20120094110016） |
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| 摘 要： | 采用大涡模拟方法（LES）对波流环境中的垂向圆管射流进行了数值模拟。出口边界采用人工海绵层加零梯度条件以减小数值反射，且保证自由出流；入口边界分别采用线性叠加和非线性叠加的波流边界条件，通过与物理实验数据对比发现，采用非线性叠加的边界条件时模拟精度更高。数模结果表明，在波浪和水流共同作用下，射流体上部出现了较为明显的“水团”现象，射流平均速度矢量较纯流环境中更靠近底床，这与前期实验观察的结果一致。
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| 关 键 词： | 射流 波流 大涡模拟 |
| 收稿时间： | 2013-07-26 |
Large eddy simulation of a jet in wave-current environment |
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| Affiliation: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Numerical simulation of a vertical round jet in wave-current environment was performed using the Large Eddy Simulation (LES) method. The zero-gradient condition combined with a sponger layer was imposed at the outflow boundary to reduce the numerical reflection. The linear and non-linear superposition of wave and current boundary conditions were adopted at the inflow boundary respectively. The latter was proved to be of higher precision by comparison of the velocity profiles with the experimental data. Numerical results show that under the combined effect of wave and current, an apparent "water masses" phenomenon appears on the upper part of jet body and the jet velocity vectors are deflected closer to the bottom than that in a pure current environment, which is consistent with the previous experimental observations. |
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