CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   FLUENT (https://www.cfd-online.com/Forums/fluent/)
-   -   question about fluent post-processing to calculate the cross-sectional area (https://www.cfd-online.com/Forums/fluent/228704-question-about-fluent-post-processing-calculate-cross-sectional-area.html)

lbj007 July 10, 2020 21:16
question about fluent post-processing to calculate the cross-sectional area
 
I wonder why the area isn't the same when I create some iso-surfaces,it should be the same,since I need to calculate the mass flow of these iso-surfaces which is very small,the area of it must try to be consistent,I don't know why:confused:

https://s1.ax1x.com/2020/07/11/UQm7yq.png

MKuhn July 13, 2020 07:14
Be honest, 2.399998e-5 and 2.4000056e-5 is quite the same. These narrow differences occur during the meshing process. If is this a problem for you, refine your mesh.

lbj007 July 14, 2020 22:43
Quote:
Originally Posted by MKuhn (Post 777625)
Be honest, 2.399998e-5 and 2.4000056e-5 is quite the same. These narrow differences occur during the meshing process. If is this a problem for you, refine your mesh.
now I also know the area is almost the same,it doesn't affect the result.I think my mesh is good enough using block

https://s1.ax1x.com/2020/07/15/UdKm6I.md.png

but I have another question,Why the grid lines of the two interfaces shown in the following figure are different。

https://s1.ax1x.com/2020/07/15/UdM93j.md.png

MKuhn July 15, 2020 03:39
Quote:
Originally Posted by lbj007 (Post 777744)
Why the grid lines of the two interfaces shown in the following figure are different
.
As the meshing process is a bit random.

lbj007 July 16, 2020 09:13
Quote:
Originally Posted by MKuhn (Post 777760)
.
As the meshing process is a bit random.
OK，thanks, so it doesn't affect the calculation results, right?

MKuhn July 16, 2020 09:16
Yes it should not.


All times are GMT -4. The time now is 15:16.