【摘要】 采用基于重整化群(RNG)方法的k~ε模型结合混合有限分析法(HFAM)对静止环境中有限水深水平圆形热浮力射流进行了数值模拟,计算所得对称面上的温度等值线图与前人所做实验符合较好.进一步地分析表明,在相同的淹没深度下,对称面上温度(速度)衰减速度随密度弗劳德数的增加而减慢;在相同的密度弗劳德数条件下,对称面上的温度(速度)衰减随淹没深度的增加而加快;对射流近区的流动区域划分的初步分析,有助于对流动结构的认识;证明了该数学模型能够有效地对此种流动进行数值研究.更多还原

【Abstract】 3-D round heated buoyant jets discharged from a horizontally submerged port in quiescent shallow water were analyzed by using the buoyancy extended RNG based model,and it was solved by using the hybrid finite analytic method(HFAM).The temperature contours in the symmetrical plane was in good agreement with the experiments.It was seen from further analysis that the decay rate of temperature(velocity)in the symmetry plane would decrease with the increase of dens metric Froude number at the same relative depth of submergence.For a given dens metric Froude number,the decay rate of temperature(velocity) would increase with the increase of relative depth of submergence.The criteria for the subdivision of the flow field were analyzed and the flowing configuration was implemented.Thus the reliability of the mathematical model was testified,and this model could be used to simulate this type of thermal buoyant jets.更多还原