摘要
基于三维不可压缩流动的N-S方程建立水流水温模型,模型在动量方程中考虑浮力作用并取消了静水压力假定,采用大涡模拟紊流模型计算紊动扩散,并考虑水面散热及其太阳辐射的影响因素,适合于对复杂流态及其有密度分层流动的数值模拟。应用所建立的数学模型对三峡近坝区从庙河至坝前水域的三维流场及温度场进行了数值模拟,计算出的水温分布与坝前观测的水温分布二者符合良好。模拟结果表明,三峡水库在蓄水至139 m水位时,垂向没有明显的水温分层,与实测结果相符。
A water flow and water temperature model was developed based on Navier-Stokes equations for 3D incompressible flows. In the momentum equation, the action of buoyancy was taken into account, and the assumption on static pressure was cancelled. With Smagorinsky- Deardorff large eddy simulation model used for calculation of turbulence diffusion and the factors of heat dissipation over water surface and solar radiation taken into account, the model is suitable for numerical simulation of complex flow patterns and flows with layered density. The developed model was applied to numerical simulation of 3D flow field and temperature field of the water area near the Three-Gorges Reservoir, and the water temperature distribution calculated by the model accorded well with that of the observed result. The calculated result also shows that water temperature stratification does not occur in vertical direction at the storage level 139m of the Three-Gorges Reservoir, and the result is in good agreement with the reality.
出处
《水利水电科技进展》
CSCD
北大核心
2007年第3期17-20,共4页
Advances in Science and Technology of Water Resources
基金
国家重点基础研究发展计划(2006CB403304)
高等学校博士学科点专项科研基金(20060003038)
关键词
三峡水库
流场
温度场
大涡模拟
三维数值模拟
Three-Gorges Reservoir
flow field
temperature field
large eddy simulation
3D numerical simulation
