convergence problem help!!

vijeshjoshi23 · February 3, 2010, 06:16

Hello friends,
we r trying to wall temp for the case of "natural flow through a vertical heated pipe (buoyant flow)".. wall boundary condition is constant heat flux.. Inlet and outlet are set as "opening type"... We r observing Courant number... Courant number < 1 so is being taken care of... residual target is set to be 1e-5.. But aprox around 1e-3 residual curves are going straight... What could be the problem?? lowest dx used in the mesh is "10 mm" and dt=0.003 sec...

ghorrocks · February 3, 2010, 23:34

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

February 3, 2010, 06:16	convergence problem help!!	#1
vijeshjoshi23 New Member Vijesh Joshi Join Date: Mar 2009 Posts: 10 Rep Power: 17	Hello friends, we r trying to wall temp for the case of "natural flow through a vertical heated pipe (buoyant flow)".. wall boundary condition is constant heat flux.. Inlet and outlet are set as "opening type"... We r observing Courant number... Courant number < 1 so is being taken care of... residual target is set to be 1e-5.. But aprox around 1e-3 residual curves are going straight... What could be the problem?? lowest dx used in the mesh is "10 mm" and dt=0.003 sec...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
convergence problem when use pisoFoam, LES for wind tunnel case	Forrest_Lei	OpenFOAM	3	July 19, 2011 07:00
convergence problem	commonyue	Main CFD Forum	1	December 1, 2009 04:54
Convergence of CFX field in FSI analysis	nasdak	CFX	2	June 29, 2009 02:17
3D Fluid Flow Convergence problem	Emily	FLUENT	2	March 21, 2007 23:18
Non Convergence of 3D Heat transfer cfd problem	Balraj	Main CFD Forum	3	December 9, 2004 01:24

February 3, 2010, 23:34		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	http://www.cfd-online.com/Wiki/Ansys...gence_criteria