what solver for 90° turbulent bender airflow

weigsi · January 13, 2011, 13:51

Hi there,
i want to validate a airflow throw a 90° bender with high Re around 100000-200000, diameter 0,2m
eventually i have to define a rough wall afterwards but first i want to handle the problem in smooth mode...
is there any suggestion on wich solver i have to choose and if there is a solver how high/low y+ should be in this case?
thx for help

abdul099 · January 15, 2011, 08:21

Which Y+ value you should maintain doesn't depend on the solver but on the turbulence model.
Low-re model = Y+ < 1
High-re model = 30 < Y+ < ~150
Two layer model = theoretically "arbitrary Y+ < 150", but avoid the range from lets say 2 to 20.

For other solver settings and a recommendation just have a look on the answer to your other post with the same topic from about 2 hours earlier.

By the way, there will be no faster answer when posting twice. Most people here will not earn money with posting hints and hence are not waiting the whole day for new posts. So it can take some time until a question is read by somebody who knows an answer.

January 13, 2011, 13:51	what solver for 90° turbulent bender airflow	#1
weigsi New Member hhuh huhu Join Date: Jan 2011 Posts: 9 Rep Power: 15	Hi there, i want to validate a airflow throw a 90° bender with high Re around 100000-200000, diameter 0,2m eventually i have to define a rough wall afterwards but first i want to handle the problem in smooth mode... is there any suggestion on wich solver i have to choose and if there is a solver how high/low y+ should be in this case? thx for help

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
2D differentially heated cavity, which is appropriate solver?	vetnav	OpenFOAM	12	July 6, 2017 05:49
Stability problem due to turbulent dispersion force in a subcooled boiling model	Edy	OpenFOAM	7	August 10, 2011 12:00
CFX 5.5	Roued	CFX	1	October 2, 2001 16:49
Setting a B.C using UserFortran in 4.3	tokai	CFX	10	July 17, 2001 16:25
Error during Solver	cfd guy	CFX	4	May 8, 2001 06:04

January 15, 2011, 08:21		#2
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 21	Which Y+ value you should maintain doesn't depend on the solver but on the turbulence model. Low-re model = Y+ < 1 High-re model = 30 < Y+ < ~150 Two layer model = theoretically "arbitrary Y+ < 150", but avoid the range from lets say 2 to 20. For other solver settings and a recommendation just have a look on the answer to your other post with the same topic from about 2 hours earlier. By the way, there will be no faster answer when posting twice. Most people here will not earn money with posting hints and hence are not waiting the whole day for new posts. So it can take some time until a question is read by somebody who knows an answer.