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boundary conditions in FLUENT VOF for open channel flow

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Old   December 3, 2014, 05:10
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  #21
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Javi
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Hi all,

I found this video and I think it could help to get a better understanding of how to make VOF setup

Guida Setting VOF Fluent
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Old   December 8, 2014, 17:00
Exclamation please help me: open channel modeling problem
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Hi
Dear friends.
I'm trying model a simple rectangular channel steady-state flow on Fluent by VOF: open channel condition.
Something cause a problem and affect the results.
the geometry of my channel is 30x30cm by 0.002 slope which the channel length is 10 m ; and the flow depth is 10cm.
According to the
http://0up.ir/up10/guest/3.png
and
http://0up.ir/up10/guest/out.png
boundary conditions considered as pressure- inlet &outlet and the top of my channel considered as pressure inlet according to the Fluent Help!
I've tried many B.C. to all the boundaries. but the velocity of air at the inlet considered about 90m/s!!!!! which it increases along the channel to end and reaches to 690m/s!!!!!!!!!!!
how can it possible???? and i cant fix it
also, density reports shows the water (Secondary phase) is under the air (First phase), which it is true.
but the main problem is the air velocity in Domain. Pics.>>>>>
http://0up.ir/up10/guest/1.png
http://0up.ir/up10/guest/2.png
http://0up.ir/up10/guest/t1.png
Please help me to solve this problem.
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Old   December 11, 2014, 05:08
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Javi
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Hi Javidcfd,

I would use pressure-inlet at inlet, pressure-outlet at outlet, wall for the floor and symmetry for the rest of surfaces.

Taking a look at your mesh, I would try to refine it at the free surface region as well. Have you activated gravity option? Where is your reference pressure location? Have you marked and patched your region?
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Old   March 1, 2015, 09:35
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lana
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hi javidcfd
i have a model close to your one, but mine is flat (without bed inclination)
but i have some problems with it, how can i contact with you .. i really need your help
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Old   April 10, 2015, 02:07
Default Fluent- multiphase help
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Sazeda Begam
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I'm searching for "Heave and Pitch Simulation of Ship hull moving through head sea waves" tutorial. Please anyone send me the zip file, my mail id is sbsazeda@gmail.com
Thanks....
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Old   May 6, 2015, 06:56
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Diego Garcia Pardo
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Can anyone share the tutorial with me please?

g_muizer@yahoo.es
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Old   January 11, 2016, 21:02
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Jakub
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Me too please very much.

killerudy@gmail.com
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Old   January 22, 2016, 01:26
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Hi, can anyone share the "Heave and Pitch Simulation of Ship hull moving through head sea waves" tutorial to me please. Thank you!

sharmainepook@gmail.com
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Old   October 11, 2016, 12:35
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Sebastián Barragán
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https://www.researchgate.net/file.PostFileLoader.html?id=573faca596b7e4916d1d40 25&assetKey=AS%3A363978971729920%401463790757632
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Old   December 21, 2016, 13:49
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cesar
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can I use periodic flow for simulate open channel flow with Fluent by using VOF model?
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Old   February 25, 2017, 04:39
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Masoud Ravan
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Hi
I had the same problem (high velocity flow from outlet to domain!!!!), It is because of reference of pressure which you have to determine in "operation condition" menu. Don't forget to check specified density
Good Lock everyone.
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Old   March 5, 2017, 14:15
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Luke Whelan
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Hey if anyone is still having continuity convergence issues, I think I may have a solution. I posted a similar question a few weeks ago and updated it with the answer:

Acceptable residuals of continuity in open channel flow?

Good luck!
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Old   May 4, 2020, 08:28
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Quote:
Originally Posted by Sam Engineer View Post
Hi
please read "Heave and Pitch Simulation of Ship hull moving through head sea waves" tutorial
Please send me this tutorial. I am unable to find it.
tamarmeesam@gmail.com
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