Artificial/Laminar Viscosity Scheme

Hello to all

I am trying to understand the rationale behind Laminar and Artificial viscosity schemes.

Laminar scheme:

Artificial scheme (I broke down the Pi term and put it in the momentum equation):


Especially I am interested to know what does the difference between these schemes mean?

Please let me know your thoughts.

Thank you

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Notice
rich is deprecated. Use FormatService::renderHtml($content, Formats\RichFormat::FORMAT_KEY) instead.

#0 [internal function]: gdn_ErrorHandler(16384, 'rich is depreca...', '/var/www/forums...', 950, Array)
#1 /var/www/forums-dual-sphysics-org/library/core/functions.general.php(950): trigger_error('rich is depreca...', 16384)
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