cfx turbulent model

yaseen wsu · January 9, 2016, 10:06

Dear all I have two questions:
1- I use CFX I want to use (RNG) model but I do not find it, fluent has this model but in cfx I can not find it.
2- from the upstream of my model (flow over spillway) I know height of water but I dont know velocity of inlet, what I should do?.
thanks

supersweet · January 9, 2016, 13:51

Try enabling the beta models

eng_norouzi · January 13, 2016, 23:47

if you know the inlet and outlet pressure of your case you can solve it, you don't necessarily need to have the inlet velocity.

ghorrocks · January 14, 2016, 01:52

RNG - you might need the advanced turbulence license to access this. Do you have an advanced turbulence license option (or a full capability solver license)?

If you know the water height but not the flow then use a pressure boundary condition. Have a look at the CFX tutorials for how to implement pressure boundaries in free surface models.

January 9, 2016, 10:06	cfx turbulent model	#1
yaseen wsu Senior Member yaseen Join Date: Oct 2015 Location: Hawler Posts: 174 Rep Power: 10	Dear all I have two questions: 1- I use CFX I want to use (RNG) model but I do not find it, fluent has this model but in cfx I can not find it. 2- from the upstream of my model (flow over spillway) I know height of water but I dont know velocity of inlet, what I should do?. thanks

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January 9, 2016, 13:51		#2
supersweet New Member jack sparrow Join Date: Jan 2015 Posts: 16 Rep Power: 11	Try enabling the beta models

January 13, 2016, 23:47		#3
eng_norouzi Member ali Join Date: Feb 2011 Posts: 37 Rep Power: 15	if you know the inlet and outlet pressure of your case you can solve it, you don't necessarily need to have the inlet velocity.

January 14, 2016, 01:52		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,729 Rep Power: 143	RNG - you might need the advanced turbulence license to access this. Do you have an advanced turbulence license option (or a full capability solver license)? If you know the water height but not the flow then use a pressure boundary condition. Have a look at the CFX tutorials for how to implement pressure boundaries in free surface models.