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-   -   introduce air to water flow (https://www.cfd-online.com/Forums/flow-3d/86510-introduce-air-water-flow.html)

masoudarami March 24, 2011 10:12

introduce air to water flow
 
hi
I want to know how to introduce air with constant velocity into water flow in one fluid and free surface?

tekcev March 24, 2011 10:58

hi

i wanna make a nozzle analysis. water goes to air. i dont know how to do.
Can anyone help me to_?

mohammad.sarfaraz April 4, 2011 04:51

Quote:

Originally Posted by masoudarami (Post 300889)
hi
I want to know how to introduce air with constant velocity into water flow in one fluid and free surface?

If you are modeeling free srface, like a spillway, you should activate Air Enterainment submodel in the Physics Tab.

mohammad.sarfaraz April 4, 2011 04:52

Quote:

Originally Posted by tekcev (Post 300900)
hi

i wanna make a nozzle analysis. water goes to air. i dont know how to do.
Can anyone help me to_?


In this case, you must run the problem as 2 fluid.

cheerlapraveenkumar April 5, 2011 00:19

cfd analysis of heat transfer in a tube with inserts
 
in my case...in fluent after some iterations it is giving floating point error...
what is the floating point error?why it is coming?

Behnam Ghadimi October 2, 2011 15:09

Quote:

Originally Posted by cheerlapraveenkumar (Post 302227)
in my case...in fluent after some iterations it is giving floating point error...
what is the floating point error?why it is coming?

hi,
i see this error when i used some zero value for initializing the model parameter, change this value and if their real value is zero use small value in initializing menu.

new anne February 19, 2012 06:31

hi
do you know in flow 3d how we can use air entrainment in specified sections?in spillways I mean.and also about parameters.specially entrainment rate ceofiecient...I have no idea about it.
thanks

masoud.ravan September 8, 2016 03:02

Hi everyone
I want to inject air (with known rate) from bottom of the channel to water flow?
I dont know if Flow3D could simulate this...and also i think airentrainment submodel Pulls air into the water flow due to turbulence
Please help me..
Tanks

zhouyu3092070 September 13, 2016 04:19

Quote:

Originally Posted by masoud.ravan (Post 617049)
Hi everyone

I want to inject air (with known rate) from bottom of the channel to water flow?

I dont know if Flow3D could simulate this...and also i think airentrainment submodel Pulls air into the water flow due to turbulence

Please help me..

Tanks


you can try "mass momentum source" to inject air to water

masoud.ravan September 13, 2016 09:06

Quote:

Originally Posted by zhouyu3092070 (Post 617698)
you can try "mass momentum source" to inject air to water

Thank you very much
Would you please explain "mass momentum source" more?:confused:

masoud.ravan September 13, 2016 09:15

Quote:

Originally Posted by new anne (Post 345172)
hi
do you know in flow 3d how we can use air entrainment in specified sections?in spillways I mean.and also about parameters.specially entrainment rate ceofiecient...I have no idea about it.
thanks

Hi
This article is like your problem except that they used Ansys FLUENT 15 for their modeling. I wish it could help you.
All the best,
Masoud Ravan
http://www.tandfonline.com/doi/abs/1...nalCode=tjaw20


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