Simulating a vena contracta

Stabum · August 11, 2012, 16:37

Hello,
first of all I'm terribly sorry about my poor english. I just hope you'll be able to understand what my problem is. Thanks in advance to all those who will try to help me. I appreciate it so much.
I'm trying to simulate in CFX 13 a nozzle used to accellerate water. Obviously the water jet doesn't have a cilindrical shape right outside the nozzle. I would like to know how I can simulate the water's behaviour when it interacts with the air in order to calculate the coefficient of contraction (Cc).
ANY kind of help will be extremely appreciated.
Bye.

ghorrocks · August 12, 2012, 08:00

So is the flow a free surface simulation? If so, have you done the free surface example tutorrials? They show you how to set up free surface simulations.

Stabum · August 12, 2012, 13:16

The water flow exits the nozzle and moves through the air reducing its cross section. It means it's a free surface simulation? No, I'm sorry, I've not done any free surface example tutorial. Where can I find them?
Thanks a lot!

ghorrocks · August 12, 2012, 21:53

Yes, this is a free surface simulation.

For tutorials on this go to the tutorials provided in the CFX documentation. "Free surface flow over a bump" is one you should look into closely.

Stabum · August 14, 2012, 06:12

There's a lot of new stuff here

But, of course, if I want lo learn to use this amazing program, that's exactly what I need!
Thanks so much for your advices. I have to find the way to study ALL these tutorials.
Thanks again

August 11, 2012, 16:37	Simulating a vena contracta	#1
Stabum Member Join Date: Aug 2012 Location: Italy Posts: 66 Rep Power: 13	Hello, first of all I'm terribly sorry about my poor english. I just hope you'll be able to understand what my problem is. Thanks in advance to all those who will try to help me. I appreciate it so much. I'm trying to simulate in CFX 13 a nozzle used to accellerate water. Obviously the water jet doesn't have a cilindrical shape right outside the nozzle. I would like to know how I can simulate the water's behaviour when it interacts with the air in order to calculate the coefficient of contraction (Cc). ANY kind of help will be extremely appreciated. Bye.

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August 12, 2012, 08:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	So is the flow a free surface simulation? If so, have you done the free surface example tutorrials? They show you how to set up free surface simulations.

August 12, 2012, 13:16		#3
Stabum Member Join Date: Aug 2012 Location: Italy Posts: 66 Rep Power: 13	The water flow exits the nozzle and moves through the air reducing its cross section. It means it's a free surface simulation? No, I'm sorry, I've not done any free surface example tutorial. Where can I find them? Thanks a lot!

August 12, 2012, 21:53		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, this is a free surface simulation. For tutorials on this go to the tutorials provided in the CFX documentation. "Free surface flow over a bump" is one you should look into closely.

August 14, 2012, 06:12		#5
Stabum Member Join Date: Aug 2012 Location: Italy Posts: 66 Rep Power: 13	There's a lot of new stuff here But, of course, if I want lo learn to use this amazing program, that's exactly what I need! Thanks so much for your advices. I have to find the way to study ALL these tutorials. Thanks again