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学习 汇报

学习 汇报. 汇报人:吴华帅 日 期: 20120913. 主要内容. 1 、 RS 中 PBM 模拟 2 、 vavle 中 single phase 模拟 3 、 RS 中 single phase 模拟 4 、下一步学习计划. Fluent 中 L uo 模型:基于各向同性湍流的 假设. 破碎,无聚并. 破碎,有聚并.

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学习 汇报

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  1. 学习汇报 汇报人:吴华帅 日 期:20120913

  2. 主要内容 • 1、RS中PBM模拟 • 2、vavle中single phase 模拟 • 3、RS中single phase模拟 • 4、下一步学习计划

  3. Fluent中Luo模型:基于各向同性湍流的假设 破碎,无聚并 破碎,有聚并 Bubble size distribution at outlet,6000rpm, bubbles at inlet are specified as 200um Bubble size distribution at outlet,6000rpm, bubbles at inlet are specified as 200um

  4. 小结 • 1、Luo模型由于是基于各向同性湍流假设之上构建的。 • 2、经过文献调研,认为RS构体中气泡破碎为剪切流中的粘性破碎,因此,需要构建新的破碎核函数。

  5. UDF:breakup kernel Bubble size distribution at outlet,400rpm, bubbles at inlet are specified as 200um

  6. Breakup probability (viscous force dominated) Breakup criterion: Breakup time: Breakup probability: α is an adjustable parameter.

  7. High Pressure Vavle5 Single Phase

  8. 压力入口:300bar ,压力出口:30bar, 得到速度入口:85m/s

  9. Contour of static pressure

  10. 速度入口:2.77m/s , 压力出口:30bar, 得到压力入口:30.3bar

  11. Contour of static pressure

  12. RS Single phase 模拟 Ks=23.4

  13. 剪切分布的比较 牛顿流体 粘度为μ=10pa.s 1.09rpm,层流 • 非牛顿流体:k=110,n=0.26 • 定义表观粘度为10pa.s • 1.09rpm,层流

  14. x=0,contours of strain rate 非牛顿流体 牛顿流体

  15. y=0,contours of strain rate 非牛顿流体 牛顿流体

  16. z=0.072(rotor)contours of strain rate 非牛顿流体 牛顿流体

  17. z=0.074(neither stator nor rotor),contours of strain rate 非牛顿流体 牛顿流体

  18. z=0.078(stator),contours of strain rate 非牛顿流体 牛顿流体

  19. 结论 1、在定义的非牛顿流体表观粘度与牛顿流体粘度相同,功耗相同的情况下,在RS构体中非牛顿流体的strain rate要比牛顿流体的大。 2、通过三种不同牛顿流体与五种非牛顿流体模拟计算验证了Metznerand Otto 假设:γ=KsN,算出Ks=23.4。

  20. 下一步学习计划 1、学习关于UDF的内容,同时修改breakup kernel; 2、进一步解决Valve5中单相模拟遇到的问题,之后进入气液两相流模拟;

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