One of the inlets can not flow out in the case used by LES

Jingwei36 · April 26, 2018, 11:11

I'm modeling a tube flow with two inlets and two outlets. I use the Large eddy simulation, and initialize with 'all zone'. Then, only inlet 1 can flow out while inlet 2 can not flow out. I was so puzzled. Thank you for your reply.

LuckyTran · April 26, 2018, 12:15

You should learn how to initialize properly and not using the "compute from" feature. The compute from feature is a convenience option. When you choose compute from, the values that will eventually be used set as the initial values will appear in the GUI immediately. What you see is what you get. If you're unhappy with it, then change it!

If you are doing LES, it's better to start with a steady or RANS simulation to provide the initial conditions.

Jingwei36 · April 27, 2018, 10:43

Quote:

Originally Posted by LuckyTran

You should learn how to initialize properly and not using the "compute from" feature. The compute from feature is a convenience option. When you choose compute from, the values that will eventually be used set as the initial values will appear in the GUI immediately. What you see is what you get. If you're unhappy with it, then change it!

If you are doing LES, it's better to start with a steady or RANS simulation to provide the initial conditions.

It is very nice of you to answer this question. With your advice, the simulation is worked correctly. Thank you very much. And I am still wondering that why two inlets can flow out with other viscous model when compute from 'all zone', while only inlet 1 can flow out with LES.

April 26, 2018, 11:11	One of the inlets can not flow out in the case used by LES	#1
Jingwei36 New Member Jingwei Join Date: Apr 2018 Posts: 2 Rep Power: 0	I'm modeling a tube flow with two inlets and two outlets. I use the Large eddy simulation, and initialize with 'all zone'. Then, only inlet 1 can flow out while inlet 2 can not flow out. I was so puzzled. Thank you for your reply.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Oscillating flow over a cavity validation case	Sparow89	FLUENT	0	June 2, 2016 16:18
Numerical error or case error? Flow in a 3D pipe	fsalvucci	OpenFOAM	40	January 30, 2013 08:10
Different Flow in One Case	Dong Fu	FLUENT	0	February 1, 2008 10:28
how to predict unsteady flow from case definition?	Felix	Main CFD Forum	6	August 28, 2007 17:40
fluid flow fundas	ram	Main CFD Forum	5	June 17, 2000 22:31

April 26, 2018, 12:15		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	You should learn how to initialize properly and not using the "compute from" feature. The compute from feature is a convenience option. When you choose compute from, the values that will eventually be used set as the initial values will appear in the GUI immediately. What you see is what you get. If you're unhappy with it, then change it! If you are doing LES, it's better to start with a steady or RANS simulation to provide the initial conditions.