residual of Continuity equation

mohamad.afsari · February 25, 2014, 03:06

Hi everybody
I simulate the multiphase flow (resin and air) in blade
(my problem) In run of Fluent,residual of Continuity equation is (approximately) constant.
I dont know this reason(in my run no reverse flow,no error and resin is infusion correctly)

please help

JKoeleman · February 28, 2014, 05:21

Hi,

Do you mean the residual continuity equation won't converge?
if so, try to reduce the explicit relaxation factors under solution control. Default is 0.75 and in my case (simple rtm simulation in flat plate) reducing it to 0.55 made the simulation converge.

With kind regards,
Jeroen

mohamad.afsari · March 1, 2014, 00:22

Hi Jeroen
no,residual continuity equation is converge
I put a link a picture from running,please check

http://uplod.ir/nwkcds52qcfo/3-1-2014_8-38-54_AM.jpg.htm

Thank you

JKoeleman · March 1, 2014, 14:10

I'm not that experienced with cfd simulations, but it does look ok to me.. What should it do according to you?

mohamad.afsari · March 1, 2014, 22:59

infusion in the my case is slowly,I think slowly infusion is the
reason of continuity

In your case (simple rtm simulation in flat plate), what is viscous resistance in fluent?

JKoeleman · March 2, 2014, 04:41

i'm using 5e8 for the viscous resistance. In the comming weeks I'm going to do some experiments to define the permeability of the fabric I'm going to use.

mohamad.afsari · March 2, 2014, 05:38

Hi
My lay up and glass fiber are different(
Combination of 0-90 , 45-45 glass fiber and core material)
what is your method in your experiment(to obtain viscous resistance)?
Have you any paper in about viscous resistance of glass fiber?

Thank you for your attention

JKoeleman · March 2, 2014, 06:00

Hi,

I think I wil go for the radial permeability test, but I'm not completely sure about that yet...

Below there ar a few papers about rtm and permeability of fibers:

http://elib.uni-stuttgart.de/opus/vo...ORGE_PRINT.pdf
http://web.mit.edu/andrew3/Public/Pa...nt_Ferland.pdf
http://www.cheric.org/PDF/KARJ/KR18/KR18-4-0217.pdf

With kind regards,
Jeroen

February 25, 2014, 03:06	residual of Continuity equation	#1
mohamad.afsari New Member mohamad Join Date: Oct 2013 Posts: 15 Rep Power: 12	Hi everybody I simulate the multiphase flow (resin and air) in blade (my problem) In run of Fluent,residual of Continuity equation is (approximately) constant. I dont know this reason(in my run no reverse flow,no error and resin is infusion correctly) please help

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February 28, 2014, 05:21		#2
JKoeleman New Member Jeroen Koeleman Join Date: Feb 2014 Posts: 5 Rep Power: 12	Hi, Do you mean the residual continuity equation won't converge? if so, try to reduce the explicit relaxation factors under solution control. Default is 0.75 and in my case (simple rtm simulation in flat plate) reducing it to 0.55 made the simulation converge. With kind regards, Jeroen

March 1, 2014, 00:22		#3
mohamad.afsari New Member mohamad Join Date: Oct 2013 Posts: 15 Rep Power: 12	Hi Jeroen no,residual continuity equation is converge I put a link a picture from running,please check http://uplod.ir/nwkcds52qcfo/3-1-2014_8-38-54_AM.jpg.htm Thank you

March 1, 2014, 14:10		#4
JKoeleman New Member Jeroen Koeleman Join Date: Feb 2014 Posts: 5 Rep Power: 12	I'm not that experienced with cfd simulations, but it does look ok to me.. What should it do according to you?

March 1, 2014, 22:59		#5
mohamad.afsari New Member mohamad Join Date: Oct 2013 Posts: 15 Rep Power: 12	infusion in the my case is slowly,I think slowly infusion is the reason of continuity In your case (simple rtm simulation in flat plate), what is viscous resistance in fluent?

March 2, 2014, 04:41		#6
JKoeleman New Member Jeroen Koeleman Join Date: Feb 2014 Posts: 5 Rep Power: 12	i'm using 5e8 for the viscous resistance. In the comming weeks I'm going to do some experiments to define the permeability of the fabric I'm going to use.

March 2, 2014, 05:38		#7
mohamad.afsari New Member mohamad Join Date: Oct 2013 Posts: 15 Rep Power: 12	Hi My lay up and glass fiber are different( Combination of 0-90 , 45-45 glass fiber and core material) what is your method in your experiment(to obtain viscous resistance)? Have you any paper in about viscous resistance of glass fiber? Thank you for your attention

March 2, 2014, 06:00		#8
JKoeleman New Member Jeroen Koeleman Join Date: Feb 2014 Posts: 5 Rep Power: 12	Hi, I think I wil go for the radial permeability test, but I'm not completely sure about that yet... Below there ar a few papers about rtm and permeability of fibers: http://elib.uni-stuttgart.de/opus/vo...ORGE_PRINT.pdf http://web.mit.edu/andrew3/Public/Pa...nt_Ferland.pdf http://www.cheric.org/PDF/KARJ/KR18/KR18-4-0217.pdf With kind regards, Jeroen