Fluid Solid Interaction

ashtonJ · November 30, 2011, 18:49

Hi all

I got the following error while doing FSI simulation inside a straight tube.

A negative ELEMENT volume has been detected. This is a fatal error and execution will be terminated

Does inappropriate boundary condition result in this error? If not, what the problem is. I used a time dependent velocity distribution at inlet.

Thank you
Regards,
AshtonJ

Zigainer · December 2, 2011, 07:52

Negative element volume is probably a mesh problem, so first check your mesh.

omidiut · December 2, 2011, 11:37

When your deformation in solid domain is large, this error always be occur. One of the limitation of FSI simulation is it. you most use smaller time step.

qingyue1987 · December 12, 2011, 06:37

YEAH，i also encounter the same problem. I learn to use the rigid body .but if the force was applied the mesh motion will destroy the elements....how to solve the problem? are there someone know how to use the rigid body and how to write the formula or CEL for it?

omidiut · December 13, 2011, 03:14

rigid body solution is different from FSI solution.cloud you explain more?

qingyue1987 · December 13, 2011, 03:18

you know ,rigid body is another type of simulation of FSI,

k_k · December 15, 2011, 06:31

Increase the mesh stiffness near smaller elements or where you have folder mesh. Use a smaller time step.

qingyue1987 · December 15, 2011, 06:35

how to use ''transiant analysis''and 'steady state analysis' in FSI ?

November 30, 2011, 18:49	Fluid Solid Interaction	#1
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 16	Hi all I got the following error while doing FSI simulation inside a straight tube. *A negative ELEMENT volume has been detected. This is a fatal error and execution will be terminated* Does inappropriate boundary condition result in this error? If not, what the problem is. I used a time dependent velocity distribution at inlet. Thank you Regards, AshtonJ

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help needed in meshing for Solid to Fluid Heat Transfer	niazaliahmed	FLUENT	2	February 22, 2020 15:47
Can CFX do CHT simulations with a solid domain rotating in a stationary fluid domain?	acro	CFX	15	September 23, 2016 11:16
Water subcooled boiling	Attesz	CFX	7	January 5, 2013 03:32
Chemical interaction between solid and fluid	rock	FLUENT	3	March 31, 2010 17:49
coupling solid and fluid cells??	kcg	Siemens	4	March 13, 2007 09:39

December 2, 2011, 07:52		#2
Zigainer Senior Member Join Date: May 2011 Location: Germany Posts: 130 Rep Power: 14	Negative element volume is probably a mesh problem, so first check your mesh.

December 2, 2011, 11:37		#3
omidiut Senior Member omid Join Date: Apr 2011 Posts: 105 Rep Power: 14	When your deformation in solid domain is large, this error always be occur. One of the limitation of FSI simulation is it. you most use smaller time step.

December 12, 2011, 06:37		#4
qingyue1987 New Member JIM Join Date: Nov 2011 Posts: 5 Rep Power: 14	YEAH，i also encounter the same problem. I learn to use the rigid body .but if the force was applied the mesh motion will destroy the elements....how to solve the problem? are there someone know how to use the rigid body and how to write the formula or CEL for it?

December 13, 2011, 03:14		#5
omidiut Senior Member omid Join Date: Apr 2011 Posts: 105 Rep Power: 14	rigid body solution is different from FSI solution.cloud you explain more?

December 13, 2011, 03:18		#6
qingyue1987 New Member JIM Join Date: Nov 2011 Posts: 5 Rep Power: 14	you know ,rigid body is another type of simulation of FSI,

December 15, 2011, 06:31		#7
k_k Member Kailash Join Date: May 2011 Location: London, UK Posts: 45 Rep Power: 14	Increase the mesh stiffness near smaller elements or where you have folder mesh. Use a smaller time step.

December 15, 2011, 06:35		#8
qingyue1987 New Member JIM Join Date: Nov 2011 Posts: 5 Rep Power: 14	how to use ''transiant analysis''and 'steady state analysis' in FSI ?