Mesh stiffness in 1 way FSI

vmlxb6 · February 10, 2011, 03:47

In default domain we define the mesh stiffness. Does the mesh stiffness interfere with the displacements ?????

Thank you.

ghorrocks · February 10, 2011, 05:14

It is a weighting factor on the mesh smoothing algorithm. So I guess, yes, it does "interfere with the displacements".

vmlxb6 · February 10, 2011, 05:15

How should I determine the value of my Stiffness factor ???

stumpy · February 15, 2011, 10:24

The mesh stiffness doesn't change the motion of the boundaries (unless the boundaries are unspecified, then it can have an indirect effect), so different stiffnesses give the same flow solution. If your mesh quality remains OK then there's no need to change the stiffness. If the mesh folds or the quality becomes poor then a different stiffness may help. For example increasing the mesh stiffness near boundaries produces a stiff boundary layer mesh (i.e. it moves with the boundary rather than getting compressed).

vmlxb6 · February 15, 2011, 17:17

Thank you.

February 10, 2011, 03:47	Mesh stiffness in 1 way FSI	#1
vmlxb6 Senior Member Ugly Kid Joe Join Date: Aug 2010 Posts: 193 Rep Power: 8	In default domain we define the mesh stiffness. Does the mesh stiffness interfere with the displacements ????? Thank you.

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February 10, 2011, 05:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,544 Rep Power: 104	It is a weighting factor on the mesh smoothing algorithm. So I guess, yes, it does "interfere with the displacements".

February 10, 2011, 05:15		#3
vmlxb6 Senior Member Ugly Kid Joe Join Date: Aug 2010 Posts: 193 Rep Power: 8	How should I determine the value of my Stiffness factor ???

February 15, 2011, 10:24		#4
stumpy Senior Member Join Date: Apr 2009 Posts: 532 Rep Power: 14	The mesh stiffness doesn't change the motion of the boundaries (unless the boundaries are unspecified, then it can have an indirect effect), so different stiffnesses give the same flow solution. If your mesh quality remains OK then there's no need to change the stiffness. If the mesh folds or the quality becomes poor then a different stiffness may help. For example increasing the mesh stiffness near boundaries produces a stiff boundary layer mesh (i.e. it moves with the boundary rather than getting compressed).

February 15, 2011, 17:17		#5
vmlxb6 Senior Member Ugly Kid Joe Join Date: Aug 2010 Posts: 193 Rep Power: 8	Thank you.