经过痛苦的一段经历，终于将局部问题真相大白，为了使保位同仁不再经过我之痛苦，现在将本人多孔介质经验公布如下，希望各位能加精：
1。Gambit中划分网格之后，定义需要做为多孔介质的区域为fluid,与缺省的fluid分别开来，再定义其名称，我习惯将名称定义为porous;
2。在fluent中定义边界条件define-boundary condition-porous(刚定义的名称)，将其设置边界条件为fluid,点击t按钮即弹出与fluid边界条件一样的对话框，选中porous zone与laminar复选框,再点击porous zone标签即出现一个带有滚动条的界面；长沙环球雅思
3。porous zone设置方法：
1）定义矢量：二维定义一个矢量，第二个矢量方向不用定义，是与第一个矢量方向正交的；
三维定义二个矢量，第三个矢量方向不用定义，是与第一、二个矢量方向正交的；
（如何知道矢量的方向：打开grid图，看看X,Y,Z的方向，如果是X向，矢量为1,0,0,同理Y向为0,1,0，Z向为0,0,1,如果所需要的方向与坐标轴正向相反，则定义矢量为负）
圆锥坐标与球坐标请参考fluent帮助。
2）定义粘性阻力1/a与内部阻力C2：请参看本人上一篇博文“勇敢英文终于搞清fluent中多孔粘性阻力与内部阻力的计算方法”，此处不赘述；
3）如果了定义粘性阻力1/a与内部阻力C2,就不用定义C1与C0，因为这是两种不同的定义方法，C1与C0只在幂率模型中出现，该处保持默认就行了；
4）定义孔隙率porousity，默认值1表示全开放，此值按实验测值填写即可。
完了，其他设置与普通k-e或RSM相同。总结一下，与君共享!
Tutorial 7. Modeling Flow Through Porous Media
Introduction
remember to do和doing区别Many industrial applications involve the modeling of fl如何搭配冬装ow through porous media, such as filters, catalyst beds, and packing. This tutorial illustrates how to t up and solve a problem involving gas flow through porous media.
The industrial problem solved here involves gas lukeflow through a catalytic converter. Catalytic converters are commonly ud to purify emissions from gasoline and diel engines by converting environmentally hazardous exhaust emissions to acceptable substances.
morningpost
Examples of such emissions include carbon monoxide (CO), nitrogen oxides (NOx), and unburned hydrocarbon fuels. The exhaust gas emissions are forced through a substrate, which is a ceramic structure coated with a metal catalyst such as platinum or palladium.
停车场智能管理系统The nature of the exhaust gas flow is a very important factor in determining the performance of the catalytic converter. Of particular importance is the pressure gradient 成人初学者and velocity distribution through the substrate. Hence CFD analysis is ud to design efficient catalytic converters: by modeling the exhaust gas flow, the pressure drop and the uniformity of flow through the substrate can be determined. In this tutorial, FLUENT is ud to model the flow of nitrogen gas through a catalytic converter geometry, so that the flaccident是什么意思ow fipocket pceld structure may be analyzed.
This tutorial demonstrates how to do the following:
_ Set up a porous zone for the substrate with appropriate resistances.
_ Calculate a solution for gas flow through the catalytic converter using the pressure bad solver.
_ Plot pressure and velocity distribution on specified planes of the geometry.
