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-   -   boundary conditions in FLUENT VOF for open channel flow (https://www.cfd-online.com/Forums/fluent-multiphase/86501-boundary-conditions-fluent-vof-open-channel-flow.html)

FJSJ December 3, 2014 05:10

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

javidcfd December 8, 2014 17:00

please help me: open channel modeling problem
 
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.

FJSJ December 11, 2014 05:08

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?

lyl March 1, 2015 09:35

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

sazeda April 10, 2015 02:07

Fluent- multiphase help
 
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....

diegojolin May 6, 2015 06:56

Tutorial
 
Can anyone share the tutorial with me please?

g_muizer@yahoo.es

undziabundzia January 11, 2016 21:02

Me too please very much.

killerudy@gmail.com

shrmnpook January 22, 2016 01:26

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

sebastianbn October 11, 2016 12:35

Tutorial
 
https://www.researchgate.net/file.PostFileLoader.html?id=573faca596b7e4916d1d40 25&assetKey=AS%3A363978971729920%401463790757632

julio December 21, 2016 13:49

can I use periodic flow for simulate open channel flow with Fluent by using VOF model?

masoud.ravan February 25, 2017 04:39

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.

l.whelan11 March 5, 2017 14:15

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:

https://www.cfd-online.com/Forums/fl...tml#post639515

Good luck!

Meesm1 May 4, 2020 08:28

Quote:

Originally Posted by Sam Engineer (Post 431566)
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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