Plot drag coeff,lift coeff VS angle of attack

August 18, 2003, 05:38

Hi.

I'm a new user of Fluent 6.

Currently,I'm doing a project. I need to plot drag coefficient, pressure coefficient and lift coefficient against angle of attack. I couldn't find the variables in the XY-Plot. May I know how to set up boundary conditions for changing angle of attack.

Thanks

August 24, 2003, 11:43

Hi!

What you will have to do is make a separate simulation for each angle of attack. The lift and drag coeficients can be obatined from "solve-monitors-force". To change the angle of attack you should create a new mesh each time - but it would probabilly take to long. if you are dealing with airfoil in wind tunnel you can define tunnel walls as periodic boundaries (place them far away from airfoil). This way you consider wing in allmols infinite space (no effect of walls and other objest in its vicinity). Now you can define the inlet velocity in components - vx and vy - for the desired angle of attack.

hope this helps

MATEUS

August 29, 2003, 14:06

another suggestion is..for wind tunnel..u set the wall as symmetry

August 18, 2003, 05:38	Plot drag coeff,lift coeff VS angle of attack	#1
John Guest Posts: n/a	Hi. I'm a new user of Fluent 6. Currently,I'm doing a project. I need to plot drag coefficient, pressure coefficient and lift coefficient against angle of attack. I couldn't find the variables in the XY-Plot. May I know how to set up boundary conditions for changing angle of attack. Thanks

August 24, 2003, 11:43	Re: Plot drag coeff,lift coeff VS angle of attack	#2
mateus Guest Posts: n/a	Hi! What you will have to do is make a separate simulation for each angle of attack. The lift and drag coeficients can be obatined from "solve-monitors-force". To change the angle of attack you should create a new mesh each time - but it would probabilly take to long. if you are dealing with airfoil in wind tunnel you can define tunnel walls as periodic boundaries (place them far away from airfoil). This way you consider wing in allmols infinite space (no effect of walls and other objest in its vicinity). Now you can define the inlet velocity in components - vx and vy - for the desired angle of attack. hope this helps MATEUS

August 29, 2003, 14:06	Re: Plot drag coeff,lift coeff VS angle of attack	#3
nikita Guest Posts: n/a	another suggestion is..for wind tunnel..u set the wall as symmetry

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFX convergence problem simulating ogive-cylinders at varied angle of attack	jdacosta	CFX	6	February 25, 2015 22:42
[Netgen] Import netgen mesh to OpenFOAM	hsieh	OpenFOAM Meshing & Mesh Conversion	32	September 13, 2011 06:50
how to plot attack angle along with impeller span direction at leading edge	wildli	FLUENT	0	August 31, 2010 15:47
introducing angle of attack on ICEMCFD HEXA	icem beginner	Main CFD Forum	3	December 17, 2008 06:05
angle of attack	kiran	FLUENT	0	September 10, 2004 09:18