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January 16, 2024, 04:48	Deforming mesh problem - Zones definition	#1
kiurigan New Member Hakim Mkacher Join Date: Apr 2013 Posts: 8 Rep Power: 13	Hi everyone, referring to this youtube video https://www.youtube.com/watch?v=fbaV_knzzks which is a part 1 tutorial for a dynamic mesh problem for a piston and reed valve, could you please explain the utility for the fluid_valve_prisms zone and the fluid_stationary_prisms zone ? One more question, why defining the gravity force on the piston in UDF. Why not defining a global gravity force in operating conditions ? Thank you in advance.

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