how to change the inlet flow aoa

rushit_31 · November 12, 2013, 19:48

I want to change the angle of attack. So can anybody help me with it. The velocity which i need to use is 200m/s and angle of attack as 5 degree and -5 degree.

keeper · November 14, 2013, 11:36

when specifying inlet boundary condition, there is a setting for direction. By default there is "normal speed" option. So switch to "cart. vel. components" or "cyl. vel. components" depending on flow regime you want to define and by using goniometrcial functions you calculate desired components by your angles

ghorrocks · November 14, 2013, 16:40

There are many ways you can do this.
* Change the inlet boundary flow direction (as keeper suggests)
* Generate a new geometry with the airfoil at the new angle (pretty tedious and inefficient for most cases)
* Put the airfoil in a circular cutout region connected to the rest of the domain by a GGI. Then you can rotate the central region in CFX-Pre with transformation (sometimes useful as you only have to mesh once but you do not need to change the boundary conditions which is useful sometimes).

November 12, 2013, 19:48	how to change the inlet flow aoa	#1
rushit_31 New Member rushit Join Date: Nov 2013 Posts: 1 Rep Power: 0	I want to change the angle of attack. So can anybody help me with it. The velocity which i need to use is 200m/s and angle of attack as 5 degree and -5 degree.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Want Impeller Driven Fluid Flow: What Inlet and Outlet BC to use for Centrifugal Pump	Zev Xavier	FLUENT	3	May 9, 2016 06:42
Net mass flow inlet vs outlet	Nigui28	FLUENT	1	August 12, 2011 10:09
how to change inlet condition in unsteady flow?	bob	FLUENT	3	July 12, 2002 18:52
Terrible Mistake In Fluid Dynamics History	Abhi	Main CFD Forum	12	July 8, 2002 09:11
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

November 14, 2013, 11:36		#2
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	when specifying inlet boundary condition, there is a setting for direction. By default there is "normal speed" option. So switch to "cart. vel. components" or "cyl. vel. components" depending on flow regime you want to define and by using goniometrcial functions you calculate desired components by your angles

November 14, 2013, 16:40		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	There are many ways you can do this. * Change the inlet boundary flow direction (as keeper suggests) * Generate a new geometry with the airfoil at the new angle (pretty tedious and inefficient for most cases) * Put the airfoil in a circular cutout region connected to the rest of the domain by a GGI. Then you can rotate the central region in CFX-Pre with transformation (sometimes useful as you only have to mesh once but you do not need to change the boundary conditions which is useful sometimes).