Morpher moves two sides of boundary differently

mwe · June 9, 2014, 04:57

Hello,

I'm trying to simulate a simple FSI Problem (basically a density change in a fluid that causes the surrounding solid to be morphed). I'm having a little issue however.

The morpher:

a) creates a motion without apparent reason. (there is neither change in density or pressure at the start of my transient case)

b) it doesn't move both sides of the interface accordingly (it creates a gap between the two regions)

Any ideas what might cause this? Unfortunately I'm quite new to CFD in general and had to learn Star CCM+ all by myself.

Morpher Settings are: Explicit FSI, 0.3 URF for FSI, regionswise morphing, recompute interfaces on, morph from zero on, automatic thinning

me3840 · June 9, 2014, 10:20

The motion isn't without reason. Activating the motion through the morpher is what allows the regions to morph. Make sure that is selected for both regions.

ggulgulia · June 9, 2014, 13:31

Hello Mwe
can you post a simple image of your problem with bc's and the entire physics model. Mr me3840 is correct. The flow fields are causing your geometry to be morphed unexpectedly.

mwe · June 19, 2014, 05:04

Sorry, since I'm working only part time on this issue, it took me a while to reply. I attached the physics models and (to me relevant) boundary conditions. If there's anything else you need to see, let me know and I will take another screenshot.

Thanks again for your help!

June 9, 2014, 04:57	Morpher moves two sides of boundary differently	#1
mwe New Member Join Date: Apr 2014 Posts: 9 Rep Power: 12	Hello, I'm trying to simulate a simple FSI Problem (basically a density change in a fluid that causes the surrounding solid to be morphed). I'm having a little issue however. The morpher: a) creates a motion without apparent reason. (there is neither change in density or pressure at the start of my transient case) b) it doesn't move both sides of the interface accordingly (it creates a gap between the two regions) Any ideas what might cause this? Unfortunately I'm quite new to CFD in general and had to learn Star CCM+ all by myself. Morpher Settings are: Explicit FSI, 0.3 URF for FSI, regionswise morphing, recompute interfaces on, morph from zero on, automatic thinning

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Foam::error::PrintStack	almir	OpenFOAM Running, Solving & CFD	91	December 21, 2022 04:50
sliding mesh problem in CFX	Saima	CFX	46	September 11, 2021 07:38
Floating point exception: Zero divide	liladhar	CFX	11	December 16, 2013 04:07
Boundary layer thickness on the sides of a civil aircraft	m1361	Main CFD Forum	5	September 26, 2012 08:16
CFX doesn't continue calculation...	mactech001	CFX	6	November 15, 2009 21:25

June 9, 2014, 10:20		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	The motion isn't without reason. Activating the motion through the morpher is what allows the regions to morph. Make sure that is selected for both regions.

June 9, 2014, 13:31		#3
ggulgulia Senior Member Gajendra Gulgulia Join Date: Apr 2013 Location: Munich Posts: 144 Rep Power: 13	Hello Mwe can you post a simple image of your problem with bc's and the entire physics model. Mr me3840 is correct. The flow fields are causing your geometry to be morphed unexpectedly.