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

1st, 2nd order or other

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 28, 2008, 08:16
Default 1st, 2nd order or other
  #1
Ivan
Guest
 
Posts: n/a
Hi,

I am analysing fluid flow through a urinary catheter. Which fluent solving scheme would be most suited to this problem.

Kindest regards
  Reply With Quote

Old   January 28, 2008, 09:36
Default Re: 1st, 2nd order or other
  #2
Phil
Guest
 
Posts: n/a
Need more information:

Reynolds number? Bore diameter? Steady state/ transient?

etc ...
  Reply With Quote

Old   January 28, 2008, 10:09
Default Re: 1st, 2nd order or other
  #3
Ivan
Guest
 
Posts: n/a
steady state, laminar flow, bore diameter = 3.1 mm.

Have tried first and second order, First proves closer to expected results.

I am targeting flow rates through a pressure outlet at the bottom of the catheter, both first and second order verify and conform to expected reults obtained in benchmarking. But when trying varying parameters for new designs, first and second provide different results.
  Reply With Quote

Old   January 28, 2008, 10:45
Default Re: 1st, 2nd order or other
  #4
Phil
Guest
 
Posts: n/a
Do a mesh independence study. Make sure you adaquately resolve the boundary layer.

Generally 2nd order spatial discretisation should give more accurate results.
  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
2nd order upwind vs 2nd order upwind!!! Far Main CFD Forum 7 March 14, 2013 13:29
1st order vs 2nd order ken FLUENT 8 March 14, 2013 04:43
Order of accuracy: 1st or 2nd order? fisch OpenFOAM Running, Solving & CFD 2 July 6, 2011 04:37
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12
1st order temporal & 2nd order spatial Prateep Chatterjee FLUENT 0 January 19, 2003 01:31


All times are GMT -4. The time now is 10:53.