How to create iso-surface that passes through a selected zone?

This is a question that we always get.
1. Surface->Iso-Surface
Create the surface that passed through the entire domain.

2. Surface->Iso-Clip
Under 'Clip To Values Of' select 'Cell Info'. Then under that select 'Cell Zone Index'

3. Under 'Clip Surface' select the surface created in step 1.

4. Go to boundary conditon panel and determine the cell zone ID, which is the same as the Cell Zone Index.

5. Lets say the cell zone ID is 54. Then put 53.9999 and 54.0001 for 'Min' and 'Max', respectivetly.

6. Specify the name and click on 'Clip'

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