U-bend pipe validation case

engineer.iman · October 20, 2014, 23:24

Hi
i'm trying to validate the case of U-bend pipe case from Ercoftac data base using Fluent.
the geometry is as shown, the straight part is 18D long, the diameter is D=1m and the diameter of the curve is 6D.
i have only included 1D length of the outlet side to reduce the computational time and mesh size.
could you please advice me regarding the quality of my mesh.
does the figure showing the contours of axial velocity make sense?
why am i getting negative values for the tangential and radial velocities and it doesn't match -not even a bit-the real data while the axial velocity does to some extent !!
could you please advice me how can i improve the model and the results
thanks in advance

engineer.iman · October 22, 2014, 22:43

can any one tell me whether my mesh is a structured or unstructured mesh? how can you know that from the pictures?
some one advice me to try a structured mesh to see how it can improve my results but how can i do that in Fluent

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFX-Pre problem, pls help!!!	cth_yao	CFX	0	February 17, 2012 00:52
Validation of circular pipe flow with/without square edged orifice plate	Gamb1t	Main CFD Forum	0	December 27, 2011 10:56
Need Validation Case: Coupled Advection-Diffusion-	chw	Main CFD Forum	0	June 23, 2008 13:05
how to get recirulations after the bend in a pipe	SREEDHAR	FLUENT	1	April 24, 2008 11:38
Pipe bend erosion problem	John Yang	FLUENT	2	December 12, 2007 04:06

October 22, 2014, 22:43		#2
engineer.iman Member Iman Join Date: Nov 2013 Posts: 37 Rep Power: 12	can any one tell me whether my mesh is a structured or unstructured mesh? how can you know that from the pictures? some one advice me to try a structured mesh to see how it can improve my results but how can i do that in Fluent