what is the best book I can buy about flow simulation covering all of its aspects?
An Introduction to SOLIDWORKS Flow Simulation 2019
https://www.solidworks.com/partner-product/introduction-solidworksr-flow-simulation-2018-published-sdc-publications
If you have Flow simulation installed you can start with X:\Program Files\SOLIDWORKS Corp\SOLIDWORKS Flow Simulation\lang\english\Docs
(X) is the same drive where solidworks is installed.
There are 3 files
This should be enough to begin with SW Flow simulation.