CAJ | 학술논문

根据Minier的模型,获得颗粒所见流体脉动速度的朗之万模型,并推导颗粒所见流体湍流脉动速度自关联函数,该函数具有各向异性的特征,进一步由流体脉动速度朗之万模型和颗粒运动方程获得相应的颗粒PDF输运方程.为描述在网格生成湍流中的颗粒扩散运动,将颗粒PDF输运方程作相应的简化,获得一个具有颗粒湍流各向异性的解析解,将方程的解与Wells and Stock的颗粒湍流扩散实验结果进行比较,获得了很好的结果.揭示了具有各向异性特征的颗粒PDF输运方程的优越性.
근거Minier적모형,획득과립소견류체맥동속도적랑지만모형,병추도과립소견류체단류맥동속도자관련함수,해함수구유각향이성적특정,진일보유류체맥동속도랑지만모형화과립운동방정획득상응적과립PDF수운방정.위묘술재망격생성단류중적과립확산운동,장과립PDF수운방정작상응적간화,획득일개구유과립단류각향이성적해석해,장방정적해여Wells and Stock적과립단류확산실험결과진행비교,획득료흔호적결과.게시료구유각향이성특정적과립PDF수운방정적우월성.
A Langevin equation of fluctuating velocity of fluid 'seen' by particle is simplified in Minier' s model.Autocorrelation of turbulence fluctuating velocity is obtained,which has non-isotropic property.Corresponding PDF model of particle is obtained and a simplified form is used to predict turbulent particle dispersion in grid-generating turbulence flow.PDF model is solved analytically and solutions are compared with experimental results of Wells and Stock.