拟序结构 meaning in English
coherent structure
Examples
- Due to its complexity of the problem , the theories and experiment results obtained are discrepant , and some of them are even contrary one another . started from the influence by movement rules of small cavities and solid particles , the mechanisms of combined effect of cavitation and sand abrasion are study in this thesis from the aspect of the turbulent coherent structure near the wall . first , a dynamic equation is established for a single spherical bubble and single spherical sand under the non - turbulent coherent structure near the wall , and then a dynamic equation established under the turbulent coherent structure near the wall
首先从理论上推导出在典型湍流边界层模式的非拟序结构下空泡与固体颗粒的近壁区运动方程，然后推导出湍流近壁拟序结构作用下的空泡与固体颗粒的近壁区运动方程，再将两种不同条件下的的运动方程进行比较，指出湍流近壁区的拟序结构对空蚀与磨损的发生具有决定性的意义，即正是由于拟序猝发作用的存在，才使得空泡、沙粒对壁面的空蚀与磨损作用得以发生。 - And then simulations of gas - particle two phase plane wake and gas - particle two phase plane jet were carried out by using this model . after numerical simulations of the two flow fields were finished , series of analytical work was done . first , the distribution of time - averaged velocity , turbulence intensity was analyzed , and some of the simulation results were compared with those of the experiments ; the coherent structure of vortices in the near wall region of the plane wake flow were studied by describing the evolution of the eddy structures , including the forming , developing and shedding from the wall of the vortices in the near wall region ; the coherent structure of vortices in the whole field was also studied , such as the forming , developing , moving , pairing and merging of the eddies etc .
在对上述两种流动形态的二维大涡模拟研究中，首先全面地分析了气相时均流场的速度、湍流强度的分布规律以及气相速度的脉动规律等并就部分数值模拟结果与实验结果进行了对比研究；分析了平面尾迹流场中近壁处旋涡拟序结构，全面和逼真地反映了近壁处旋涡的生成、发展和脱落的规律；描述分析了平面尾迹流和平面射流的全场流动旋涡拟序结构，从整个流场的角度反映旋涡的生成、发展、运动以及旋涡之间相互配对、合并的作用规律等。 - At last , three - dimensional mathematical model of gas - particle two phase turbulence was established , and it was adopted to study the gas - particle two phase rectangular jet as well . the distribution of the time - averaged velocity and turbulence intensity was studied , and some of the simulation results were compared with the experimental results ; the coherent structure of flow field was described in the three direction , the evolution and motion of the eddies was discussed too ; the dispersion of fine particles in the three dimensional space was also investigated
全面地分析了矩形射流气相时均流场的速度、湍流强度的空间分布规律，并就部分数值模拟结果与实验结果进行了对比研究;描述分析了气相流场湍流拟序结构，对流向、横向和展向三个方向旋涡的空间结构特点进行分析研究，并分析了流向涡随时间变化的发展、运动规律。 - Gas - particle two phase turbulence is widely encountered in the nature and engineering applications . as a numerical method of turbulence , large eddy simulation ( les ) has many advantages of both direct numerical simulation and turbulent model simulation , especially when high reynolds gas - particle turbulence being simulated . thus this topic has become of great interest in fluid mechanics research
大涡模拟作为近年来备受关注的湍流数值模拟方法，同时具有直接模拟和模型模拟的很多优点，在研究高reynolds数气粒多相湍流流动中气相湍流拟序结构与颗粒的相互作用方面发挥了重要而独特的作用，已成为当今世界上流体力学工作者的热门研究主题。 - Through comparison , it can be seen that the turbulent coherent structure near the wall influences directly the striking effect of the bubble and sand . a new proposal is put forward at the end of the thesis that the destruction caused by the combination of cavitation and sand abrasion can be mitigated by means of controlling the turbulent coherent structure near the wall
最后用有关的结论对过去的空蚀与泥沙磨损联合作用的一些试验观测结果进行了定性的分析、评述，并提出通过控制拟序结构的发生以达到控制空泡、沙粒对壁面的冲击作用是减轻磨蚀破坏的一条新的途径。