Area calculation of each color for a contour

Mohsen_mtl · July 18, 2023, 14:29

Dear All,
I have a contour in Ansys CFX and I want to calculate the are related to each color. For example, I added a link to an image.
https://postimg.cc/QVCQMDTC

How can I calculate the area for each color?
Can I export the contour to other software and do it?
or I must develop a code to calculate it? But I don't know how to find the boundary of each color!

karachun · July 18, 2023, 15:13

I do not remember exact commands but you can create custom surface based on existing surface and result values. You can specify upper and lower values and CFD-post create surface within those bounds. Than you can measure area using expression.
Check "Locations" tab in CFD-Post.

Mohsen_mtl · July 18, 2023, 19:44

Dear karachun,
Thank you for your reply.
I look at all the variables in the CFX, but I can not find which one can calculate the area of each boundary in a contour. Could you please explain more? Is there any specific variable for this calculation?

Also, for the location tab, I didn't find anything related to this calculation.

Thank you for your time.

Best regards,

ghorrocks · July 18, 2023, 21:15

1) Generate a contour object which has the contours at your desired levels
2) Generate a User Surface, which uses the contour object. Select the contour level you want the user surface to use
3) Use the area()@User Surface 1 CEL function to give you the area.

Done.

Mohsen_mtl · July 19, 2023, 11:17

Dear ghorrocks and karachun,
Thank you for your help. Now I know how to calculate it.

Thanks again,

July 18, 2023, 14:29	Area calculation of each color for a contour	#1
Mohsen_mtl New Member QC Join Date: Mar 2019 Posts: 8 Rep Power: 7	Dear All, I have a contour in Ansys CFX and I want to calculate the are related to each color. For example, I added a link to an image. https://postimg.cc/QVCQMDTC How can I calculate the area for each color? Can I export the contour to other software and do it? or I must develop a code to calculate it? But I don't know how to find the boundary of each color!

July 18, 2023, 21:15		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,723 Rep Power: 143	1) Generate a contour object which has the contours at your desired levels 2) Generate a User Surface, which uses the contour object. Select the contour level you want the user surface to use 3) Use the area()@User Surface 1 CEL function to give you the area. Done. Opaque likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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July 18, 2023, 15:13		#2
karachun Senior Member Join Date: Nov 2015 Posts: 244 Rep Power: 11	I do not remember exact commands but you can create custom surface based on existing surface and result values. You can specify upper and lower values and CFD-post create surface within those bounds. Than you can measure area using expression. Check "Locations" tab in CFD-Post.

July 18, 2023, 19:44		#3
Mohsen_mtl New Member QC Join Date: Mar 2019 Posts: 8 Rep Power: 7	Dear karachun, Thank you for your reply. I look at all the variables in the CFX, but I can not find which one can calculate the area of each boundary in a contour. Could you please explain more? Is there any specific variable for this calculation? Also, for the location tab, I didn't find anything related to this calculation. Thank you for your time. Best regards,

July 19, 2023, 11:17		#5
Mohsen_mtl New Member QC Join Date: Mar 2019 Posts: 8 Rep Power: 7	Dear ghorrocks and karachun, Thank you for your help. Now I know how to calculate it. Thanks again,