question about fluent post-processing to calculate the cross-sectional area

lbj007 · July 10, 2020, 22:16

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

MKuhn · July 13, 2020, 08:14

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, 23:43

Quote:

Originally Posted by MKuhn

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

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

MKuhn · July 15, 2020, 04:39

Quote:

Originally Posted by lbj007

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, 10:13

Quote:

Originally Posted by MKuhn

.
As the meshing process is a bit random.

OK，thanks, so it doesn't affect the calculation results, right?

MKuhn · July 16, 2020, 10:16

Yes it should not.

July 10, 2020, 22:16	question about fluent post-processing to calculate the cross-sectional area	#1
lbj007 Senior Member Join Date: Feb 2020 Posts: 114 Rep Power: 6	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

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July 13, 2020, 08:14		#2
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 218 Rep Power: 17	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.

July 16, 2020, 10:16		#6
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 218 Rep Power: 17	Yes it should not.