Learning Forum

[wuxuetianzi]

Hi, 

Here is my case, a 3D porous particle with irregular shape is surrounded by air (a sphere domain).  The chemical reaction happens on the particle. After the simulation is convergent, I want to get the oxygen fraction on the particle surface by using the area-weighted average. 

Is this possible? If so, how should I do it?

The second question is also about this case. Since I am using define_source to present reaction for oxygen and it is only happed in the particle area. I also used C_UDMI to track the source value in the UDF and get the plot below.

The particle is divided by the three planes on X, Y, Z. Since this is the plot for C_UDMI which is only in the particle area, the value for C_UDMI should be zero in the surrounding fluid like the red area. But Why there is a green region around the particle (such as the part circled by the black line)?

Thanks!

 

[Rob]

Use surface reports for the former.

For the latter, replot the contour with node values off to see the "true" values on the facets. You're looking at the smoothed contour which tends to smooth the contour bands but looks much better in reports. 

[wuxuetianzi]

Hi,

Thanks for the reply. But I am not sure about the first answer. the particle is like a hollow sphere. if I do surface reports for the particle zone, will the report account both outside surface and inside surface? but I only want the value on the outside...

The value with or without "node values" is different. And you are using " "true" values ". So, which value should be correct?

Thanks!