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3d free surface open channel modeling (vof)

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Old   May 16, 2009, 06:10
Default 3d free surface open channel modeling (vof)
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sadrooz
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<H1 style="MARGIN: 12pt 0in 3pt; TEXT-ALIGN: justify">im tring to model a 3d open channel flow. i dont know if i have modeled correctly.

can anyone check this stages? thanks.

fluent 3ddp

file read case .

grid check.

define models solver ok.

define models multiphase volume of fluid open channel flow ok implicit body force ok.

define models energy not selected ok.

define models viscous k epsilon model standard enhanced wall treatment pressure gradient effects ok .

define materials water liquid copy create.

Define phases phase 1 air, phase 2 water liquid close.

Define operation conditions gravity y coordinate -9.81 specified operation density selected ok.

Define boundary conditions vel in velocity inlet phase mixture set velocity specification method components z velocity 0.25m/s specification method k and epsilon ok.

Define boundary conditions vel in velocity inlet phase 2 multiphase volume fraction 1 ok.

Define boundary conditions pressure outlet pressure outlet phase mixture set specification method k and epsilon ok.

Define boundary conditions pressure outlet pressure outlet phase water multiphase backflow volume fraction 1 ok.

Define boundary conditions pressure up pressure outlet phase mixture set specification method k and epsilon ok. Close.

Solve controls solutions piso algorithm pressure body force weighted ok.

Adapt region x between ( -1.5 ,1.5) , y( 0,2) , z ( -6 , 6) , adapt yes mark close.

Solve initialize initialize init close.

Solve initialize patch volume fraction value 1 patch.

Solve monitors residual plot select ok.

Solve iterate 1000000 iterate.

</H1>
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Old   May 16, 2009, 06:34
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Ralf Schmidt
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Hi!

I don't know about the specific VOF model settings... but the others look good...

except: you have no grid @ scale ....

And I would turn off the standard fluent convergence check in the residuals menu...

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Old   May 16, 2009, 09:47
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you can turn on the open channel flow option in boundary condition panel if you use pressure inlet or mass flow inlet in inlet boundary and pressure outlet or outflow in outlet boundary.
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Old   May 20, 2009, 05:55
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it does'nt work. the velocities are much more than real.
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Old   May 20, 2009, 10:28
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you can define the velocity magnitude in pressure inlet boundary after turning on open channel flow option.
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Old   May 21, 2009, 14:03
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thanks. i did it but it looks that the water is vaporing little by little.
the water goes up . it looks like that the gravity is opposite.
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Old   May 23, 2009, 09:52
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How did you set the outllet boundary?
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Old   May 23, 2009, 11:46
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outlet boundary:
multiphase : open channel : free surface level between (0,2).
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Old   March 28, 2010, 05:27
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hi you should put gravity in z direction not y
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Old   March 29, 2010, 02:37
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Look the mesh quality and I can not see what is the time step of the calculation. VOF method is used often as an unsteady ....
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Old   April 20, 2011, 18:40
Default are you sur??? to mark!!!!
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Adapt region x between ( -1.5 ,1.5) , y( 0,2) , z ( -6 , 6) , adapt yes mark close

i think that you have not to mark the region that you have adapt!!! iam not very sur but i hope for those ho read that topic to search and confirme :
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Old   May 28, 2011, 07:05
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Quote:
Originally Posted by gomane8 View Post
Adapt region x between ( -1.5 ,1.5) , y( 0,2) , z ( -6 , 6) , adapt yes mark close

i think that you have not to mark the region that you have adapt!!! iam not very sur but i hope for those ho read that topic to search and confirme :
you are wright .....not to adapt !!!! just MARK......iam sorry
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Old   December 23, 2011, 17:29
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Quote:
Originally Posted by hamed_roozegar View Post
<H1 style="MARGIN: 12pt 0in 3pt; TEXT-ALIGN: justify">im tring to model a 3d open channel flow. i dont know if i have modeled correctly.

can anyone check this stages? thanks.

fluent 3ddp

file read case .

grid check.

define models solver ok.

define models multiphase volume of fluid open channel flow ok implicit body force ok.

define models energy not selected ok.

define models viscous k epsilon model standard enhanced wall treatment pressure gradient effects ok .

define materials water liquid copy create.

Define phases phase 1 air, phase 2 water liquid close.

Define operation conditions gravity y coordinate -9.81 specified operation density selected ok.

Define boundary conditions vel in velocity inlet phase mixture set velocity specification method components z velocity 0.25m/s specification method k and epsilon ok.

Define boundary conditions vel in velocity inlet phase 2 multiphase volume fraction 1 ok.

Define boundary conditions pressure outlet pressure outlet phase mixture set specification method k and epsilon ok.

Define boundary conditions pressure outlet pressure outlet phase water multiphase backflow volume fraction 1 ok.

Define boundary conditions pressure up pressure outlet phase mixture set specification method k and epsilon ok. Close.

Solve controls solutions piso algorithm pressure body force weighted ok.

Adapt region x between ( -1.5 ,1.5) , y( 0,2) , z ( -6 , 6) , adapt yes mark close.

Solve initialize initialize init close.

Solve initialize patch volume fraction value 1 patch.

Solve monitors residual plot select ok.

Solve iterate 1000000 iterate.

</H1>
salam aqaie hamed
man rooie ie masaleie moshabehe in masaleie shoma kar mikonam
dar morede taeen sharaiete marzi be moshkel bar khordam mishe komakam konid?
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Old   May 20, 2013, 04:29
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Did you guys know the problem, if yes, could u please tell me what was it. Thankls
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Old   June 2, 2013, 08:15
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Quote:
Originally Posted by hamed_roozegar View Post
thanks. i did it but it looks that the water is vaporing little by little.
the water goes up . it looks like that the gravity is opposite.
I have this problem too.
I am using "Open channel flow" option in inlet and outlet boundaries. It is look like water goes up in pressure inlet boundary.
Where is the origin of the free surface and bottom. Is it in bottom of any boundary or origin of coordinates?
help me please.
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Old   August 26, 2013, 02:24
Default 3D water-gas ejector with vof
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How do we model the two phase (water-gas) ejector with vof in fluent??

I thank for the help..
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Old   January 26, 2014, 17:16
Default mixture model
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Please explain the mixed model for liquid-gas ejector simulation
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