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  • Gas-liquid test cases simulated by the Eulerian-Eulerian method

    Abstract

    The Eulerian-Eulerian (E-E) approach is widely used to simulate gas-liquid system since it is applicable to a wider range of phase fraction. However, to obtain satisfactory predictions, suitable sub-models and parameters need to be adjusted. In this work, ten classic gas-liquid systems, as the baseline test cases, were selected to validate the E-E approach numerically with fruitful experimental data in the literature. These test cases feature with different disciplines and were selected from different industries covering from chemical, nuclear, bioprocessing, metallurgical and ocean engineering. Simulations were launched by the OpenFOAM solver reactingTwoPhaseEulerFoam, in which an E-E method was implemented with sophisticated numerical techniques. The governing equations and numerical methods were firstly revisted in details. The effects of the mesh resolution, discretization scheme, turbulence model, drag force and non-drag forces on the predicted phase fraction distribution, gas holdup, liquid velocity and the turbulence variables were investigated. Our results show that the including of the drag force, as the most important momentum interfacial exchange term, is very important for all the test cases. It determines the global gas holdup and the vertical liquid velocity. Other non-drag forces play a crucial role for the test cases of which the aspect ratio of the geometry is large (e.g., pipe flows). Meanwhile, relatively coarse mesh can be used for all the test cases since the E-E approach is based on the macroscopic assumptions. The turbulence model and the bubble induced model can improve the predictions in certain cases. However, a universal model setting can be hardly obtained.

    posted in Algorithm
  • RE: 关于MPPICinterFoam

    @溯光 你可以用自带的算例尝试一下把C设为0,看看怎么样,我觉得这个比较挺有意思得

    posted in OpenFOAM
  • RE: 非结构化网格的边界层可以确定y+吗?

    @LuoS非结构化网格的边界层可以确定y+吗? 中说:

    非结构化网格的边界层可以确定y+吗?

    没看过相关理论得书。不过从代码上看可以,OpenFOAM中yPlus得计算没有限制结构网格

    posted in Meshy
  • RE: yPlus在openfoam代码里面的实现
    there are no arguments to ‘patch’ that depend on a template parameter, so a declaration of ‘patch’ 或‘internalField’或‘db’ must be available
    

    错误提示patch没有生命,你需要声明一下。你需要系统学一下。一时半会估计整不出来

    我想在openfoam里面植入y+的公式。

    你直接计算yPlus不就可以了?

    postProcess -func yPlus
    
    posted in OpenFOAM
  • RE: 多相流VOF

    文献中,,网格在5k的时候,也是有泰勒气泡的,2d

    如果可以的话,把你的网格处理到5千,然后把边界条件告诉我,我可以用openfoam给你做一下,

    posted in ANSYS Fluent
  • RE: 如何获得网格坐标?

    @danao如何获得网格坐标? 中说:

    而不是一个scalar

    网格坐标不就是个vector么?

    posted in OpenFOAM
  • RE: 多相流VOF

    我找了一下,是cnki的格式,我这面看不了,你要模拟对标的是一个硕士论文?相关结果有没有发表的英文SCI?我可以参考英文的pdf版本

    posted in ANSYS Fluent
  • RE: 多相流VOF

    文献发上来看看?
    那你也可以用5K网格试试。网格数量太大测试太慢

    posted in ANSYS Fluent
  • RE: 多相流VOF

    网格数量多少?2D?

    posted in ANSYS Fluent
  • RE: interFoam动网格计算问题计算的问题

    @史浩 没太看懂你要模拟的,但是感觉很厉害!感谢分享,楼主好人 :ok2:

    posted in OpenFOAM