Venturimeter Flow Simulation in Solidworks for beginners

meaning of reference axis in flow simulation in Solidworks: https://youtu.be/_h9gc7adJtk
Playlist for flow simulation in Solidworks for beginners: https://youtube.com/playlist?list=PLjExndY7KnkBnQ6LS2u9ZfjOMOVGFIfxI
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Step 1: