CAJ | 학술논문

采用RNG k－ε双方程湍流模型，VOF法追踪自由水面，对含柔性沉水植物河道的水力特性进行三维数值模拟研究。将柔性沉水植物区域简化为多孔介质区域，以多孔介质模型来模拟柔性植物对河道水流的影响，设定多孔介质模型对湍流的生成和耗散没有影响，以植物带前后压强差确定多孔介质模型的渗透率，以柔性植物所占空间体积比确定多孔介质模型的孔隙率。模拟结果给出了河道沿程水位曲线、流速和紊动强度等参数的垂线分布。最后，将数值模拟计算结果和试验实测结果进行了对比，两者吻合较好，这表明以多孔介质区域代替柔性沉水植物进行数值模拟是可行的。
채용RNG k－ε쌍방정단류모형，VOF법추종자유수면，대함유성침수식물하도적수력특성진행삼유수치모의연구。장유성침수식물구역간화위다공개질구역，이다공개질모형래모의유성식물대하도수류적영향，설정다공개질모형대단류적생성화모산몰유영향，이식물대전후압강차학정다공개질모형적삼투솔，이유성식물소점공간체적비학정다공개질모형적공극솔。모의결과급출료하도연정수위곡선、류속화문동강도등삼수적수선분포。최후，장수치모의계산결과화시험실측결과진행료대비，량자문합교호，저표명이다공개질구역대체유성침수식물진행수치모의시가행적。
By use of RNG k -εturbulence model and VOF method tracking the free surface ,the paper carried out 3 D numerical simulation to hydraulic characteristic of open channel with flexible submerged plants.The submerged flexible plants area is simplified as porous medium region , the porous medium model was selected to simulate the influence of porous medium on water flow .It is set up that porous me-dium model has no effect on generation and dissipation of turbulence ,and the permeability rate of porous media model is determined by the pressure difference .The porosity rate is determined by flexible plant space volume ratio .The simulation results gave the curve of water level along open channel and the verti-cal distribution of velocity of flow and turbulence intensity .At the last ,it compared the numerical simula-tion results with test results .Both the result are in good agreement ,which means that the numerical simu-lation by use of porous media region instead of flexible submerged plants is feasible .