展向旋转平面库埃特湍流瞬时场的五分解方法
发布时间：2018-12-11 18:47
【摘要】：展向旋转平面库埃特湍流是旋转系统下壁湍流研究的经典问题,并且此湍流问题中的大尺度涡卷(roll cells)结构也受到广泛关注.本文采用五分解方法将存在二次流的瞬时场分解为五部分,包括平均流场、二次流场的流向和横向部分以及剩余场的流向和横向部分.通过五分解法,可以掌握湍动能各分量在能量平衡和能量传递方面的重要机制.研究结果表明:二次流和剩余场的流向运动(横向运动)是通过二次流涡量与剩余场剪应力相关项进行能量传递,二次流(剩余场)的流向运动和横向运动之间是通过旋转项进行能量传递;此外,剩余场的流向和横向运动之间还通过压力与应变率相关的再分配项进行能量传递;对于剩余场流向部分,在一定的旋转强度范围内,通过二次流涡量与剩余场剪应力相关项从二次流流向部分获取的能量大于从平均流获取的能量,说明二次流流向运动对剩余场流向运动有很大影响.
[Abstract]:The spanned plane Kuett turbulence is a classical problem in the study of the wall turbulence in a rotating system, and the large scale vortex (roll cells) structure in this turbulence problem has been paid more and more attention. In this paper, the instantaneous field with secondary flow is decomposed into five parts, including the average flow field, the flow direction and transverse part of the secondary flow field, and the flow direction and transverse part of the residual field. By means of the five-decomposition method, the important mechanism of energy balance and energy transfer of the components of turbulent kinetic energy can be grasped. The results show that the flow direction motion (transverse motion) of the secondary flow and the residual field is transmitted through the terms of the vorticity of the secondary flow and the shear stress of the residual field. The energy transfer between the flow direction and the transverse motion of the secondary flow (residual field) is carried out by the rotation term. In addition, the energy transfer between the flow direction and the transverse motion of the residual field is carried out by the redistribution term which is related to the strain rate. For the flow direction part of the residual field, the energy obtained from the secondary flow direction is larger than the energy obtained from the average flow through the second flow vorticity and the shear stress of the residual field in a certain range of rotation intensity. It shows that the secondary flow direction motion has a great influence on the residual flow direction motion.
【作者单位】： 北京大学工学院湍流与复杂系统国家重点实验室;北京大学工学院航空航天工程系;北京大学工学院应用物理与技术研究中心;浙江大学航空航天学院工程力学系;
【基金】：国家自然科学基金(批准号:11521091,11272013,11302006)资助的课题~~
【分类号】：O357.5
本文编号：2373047
[Abstract]:The spanned plane Kuett turbulence is a classical problem in the study of the wall turbulence in a rotating system, and the large scale vortex (roll cells) structure in this turbulence problem has been paid more and more attention. In this paper, the instantaneous field with secondary flow is decomposed into five parts, including the average flow field, the flow direction and transverse part of the secondary flow field, and the flow direction and transverse part of the residual field. By means of the five-decomposition method, the important mechanism of energy balance and energy transfer of the components of turbulent kinetic energy can be grasped. The results show that the flow direction motion (transverse motion) of the secondary flow and the residual field is transmitted through the terms of the vorticity of the secondary flow and the shear stress of the residual field. The energy transfer between the flow direction and the transverse motion of the secondary flow (residual field) is carried out by the rotation term. In addition, the energy transfer between the flow direction and the transverse motion of the residual field is carried out by the redistribution term which is related to the strain rate. For the flow direction part of the residual field, the energy obtained from the secondary flow direction is larger than the energy obtained from the average flow through the second flow vorticity and the shear stress of the residual field in a certain range of rotation intensity. It shows that the secondary flow direction motion has a great influence on the residual flow direction motion.
【作者单位】： 北京大学工学院湍流与复杂系统国家重点实验室;北京大学工学院航空航天工程系;北京大学工学院应用物理与技术研究中心;浙江大学航空航天学院工程力学系;
【基金】：国家自然科学基金(批准号:11521091,11272013,11302006)资助的课题~~
【分类号】：O357.5
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