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residual of Continuity equation

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Old   February 25, 2014, 04:06
Question residual of Continuity equation
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mohamad
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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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Old   February 28, 2014, 06:21
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Jeroen Koeleman
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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
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Old   March 1, 2014, 01:22
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mohamad
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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
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Old   March 1, 2014, 15:10
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Jeroen Koeleman
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I'm not that experienced with cfd simulations, but it does look ok to me.. What should it do according to you?
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Old   March 1, 2014, 23:59
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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?
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Old   March 2, 2014, 05:41
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Jeroen Koeleman
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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.
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Old   March 2, 2014, 06:38
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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
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Old   March 2, 2014, 07:00
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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
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