docs: add geometry preparation for Fluent simulation

[RobPasMue]

Description

Follow up of current NACA airfoil example

Issue linked

None

Checklist

• [X] I have tested my changes locally.
• [X] I have added necessary documentation or updated existing documentation.
• [X] I have followed the coding style guidelines of this project.
• [X] I have added appropriate unit tests.
• [X] I have reviewed my changes before submitting this pull request.
• [X] I have linked the issue or issues that are solved to the PR if any.
• [X] I have assigned this PR to myself.
• [X] I have added the minimum version decorator to any new backend method implemented.
• [X] I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.59%. Comparing base (c807809) to head (2ca253c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1183 +/- ## ======================================= Coverage 90.59% 90.59% ======================================= Files 93 93 Lines 7015 7015 ======================================= Hits 6355 6355 Misses 660 660 ```

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