Setting up a turbine nozzle case

cfdengineer · July 30, 2010, 16:52

I am using CFX v12.1 to solve flow through a high pressure turbine nozzle. Since I am new to CFX I would like to know what is the best practice with respect to setting up turbine nozzle/blade flows. Since this is a nozzle it is not rotating. I am planning to use the SST for turbulence since I was told this is the best option, but should I start with 1st order or start everything with high resolution. The reason of the run is to compare to profile data. With respect to the turbulence option the nozzle is loaded with cooling holes that mix with the hot gas. I have been told that running 1st order would be sufficient and that running high resolution would be a waste of time and that the CFX profile difference between 1st order and high resolution would be minimal. Can someone answer that. If there is a best practice or tutorial from CFX that would help out a lot. Thank you.

ghorrocks · August 1, 2010, 06:29

Have a look at the best practises guide in the documentation for some ideas on doing good simulations. The Journal of Fluids Engineering editorial policy (http://journaltool.asme.org/Template...umAccuracy.pdf) is pretty blunt - they won't accept models done using 1st order methods. If JFE does not accept it then should you?

CCTech_Pune · August 2, 2010, 05:49

Even CFX help manual says we should not use the 1st Order solution as the final one.

July 30, 2010, 16:52	Setting up a turbine nozzle case	#1
cfdengineer New Member Stephen Join Date: Mar 2010 Posts: 21 Rep Power: 16	I am using CFX v12.1 to solve flow through a high pressure turbine nozzle. Since I am new to CFX I would like to know what is the best practice with respect to setting up turbine nozzle/blade flows. Since this is a nozzle it is not rotating. I am planning to use the SST for turbulence since I was told this is the best option, but should I start with 1st order or start everything with high resolution. The reason of the run is to compare to profile data. With respect to the turbulence option the nozzle is loaded with cooling holes that mix with the hot gas. I have been told that running 1st order would be sufficient and that running high resolution would be a waste of time and that the CFX profile difference between 1st order and high resolution would be minimal. Can someone answer that. If there is a best practice or tutorial from CFX that would help out a lot. Thank you. Last edited by cfdengineer; July 30, 2010 at 17:51. Reason: Added Question

August 2, 2010, 05:49	Setting up a turbine nozzle case	#3
CCTech_Pune New Member CCTech Join Date: Jul 2010 Posts: 20 Rep Power: 15	Even CFX help manual says we should not use the 1st Order solution as the final one.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Performance of GGI case in parallel	hannes	OpenFOAM Running, Solving & CFD	26	August 3, 2011 03:07
Comparison of axisymmetric case, Starccm+ and OpenFOAM	linnemann	OpenFOAM Running, Solving & CFD	12	June 16, 2011 05:43
icoFsiFoam case needed	vivekcfd	OpenFOAM	1	May 6, 2009 13:41
Transient case running with a super computer	microfin	FLUENT	0	March 31, 2009 11:20
Nozzle flow simulation in inviscid and viscous	Cath	FLUENT	0	January 28, 2007 02:16

August 1, 2010, 06:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Have a look at the best practises guide in the documentation for some ideas on doing good simulations. The Journal of Fluids Engineering editorial policy (http://journaltool.asme.org/Template...umAccuracy.pdf) is pretty blunt - they won't accept models done using 1st order methods. If JFE does not accept it then should you?