CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Micro-channel flow not converging

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   March 19, 2010, 03:29
Default Micro-channel flow not converging
  #1
New Member
 
Join Date: Feb 2010
Posts: 11
Rep Power: 7
esgee is on a distinguished road
Hi,

I am currently simulating 3D water flow in 0.1mm x 1mm channel and a larger cylindrical container. I have tried several different meshes but none of results are converging, the velocity residuals are levelling off at ~1e-2 and the continuity residual is at ~1e-1 or ~1e-8.

The volume of smallest cells is very low, ~1e-12 m^3, can that cause some round-off error or loss some significant numbers or something else that the result won't converge? The number of cells is ~1e6

The only data I know is the mass flow rate at the inflow. My boundary conditions are "mass flow inlet" and "outflow" (I can with high certainty say that the flow is fully developed at the outflow). I'm having difficulties to determine operating pressure and its location. Also, should gravity be involved?
esgee is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
micro channel heat exchanger design serpil kaya Main CFD Forum 4 August 15, 2013 01:38
Yacht in Open Channel Flow andreimour FLUENT 1 October 14, 2010 23:54
pressure outlet (open channel flow) Willem Brantegem Main CFD Forum 0 April 3, 2007 09:39
VOF scheme for open channel flow yan FLUENT 1 May 21, 2005 00:21
compressible channel flow.. R.D.Prabhu Main CFD Forum 0 July 17, 1998 17:23


All times are GMT -4. The time now is 16:54.