2Way_FSI_Initial additional Pressure

Ludwig Prandtl · September 1, 2017, 23:09

Hi

In Ansys CFX Two-way FSI tutorial:
"Oscillating Plate with Two-Way Fluid-Structure Interaction"
use four steps and an additional Pressure Load as initial(In transient structural module).

my questions are:
1- why is the reason of this additional pressure?
2- Is it OK, If we don't use this additional pressure and just use one step?

Best Regards,

ghorrocks · September 2, 2017, 07:33

The tutorial overview states "An initial pressure of 100 Pa is applied to one side of the thin plate for 0.5 seconds in order to distort it. Once this pressure is released, the plate oscillates backwards and forwards as it attempts to regain its equilibrium (vertical) position."

If you don't apply this force then the only deformations will be from the fluid motion. These motions might be a bit small in comparison.

September 1, 2017, 23:09	2Way_FSI_Initial additional Pressure	#1
Ludwig Prandtl New Member Join Date: Nov 2014 Posts: 18 Rep Power: 12	Hi In Ansys CFX Two-way FSI tutorial: "Oscillating Plate with Two-Way Fluid-Structure Interaction" use four steps and an additional Pressure Load as initial(In transient structural module). my questions are: 1- why is the reason of this additional pressure? 2- Is it OK, If we don't use this additional pressure and just use one step? Best Regards,

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September 2, 2017, 07:33		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The tutorial overview states "An initial pressure of 100 Pa is applied to one side of the thin plate for 0.5 seconds in order to distort it. Once this pressure is released, the plate oscillates backwards and forwards as it attempts to regain its equilibrium (vertical) position." If you don't apply this force then the only deformations will be from the fluid motion. These motions might be a bit small in comparison.