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

problem on energy and flow equation solving separately

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 30, 2013, 07:26
Default problem on energy and flow equation solving separately
  #1
New Member
 
preetam
Join Date: Feb 2012
Posts: 23
Rep Power: 5
preetam69 is on a distinguished road
hi,

in my problem there is a hollow cylinder with fluid passing through the hollow space and convective boundary condition at the outer wall of the cylinder.

earlier i was using density based solver,but i realized i want to neglect to the effect of buoyancy.so through some searching on net i found out for that i need to solve the flow and energy equations separately.

so i initially i was turning off the energy equation and solving the flow and turbulence equations and when they converged turned on the energy equation and turned off flow and turbulence equation in solution controls window in fluent.

in doing so energy equation takes 2-3 more iterations to converge but when i check the total heat balance,it gives a large residual.

can anyone help me to find out what i am doing wrong?

thnx in advance.
preetam69 is offline   Reply With Quote

Old   July 30, 2013, 15:26
Default
  #2
Senior Member
 
Join Date: Mar 2009
Location: Indiana, US
Posts: 185
Rep Power: 8
delaneyluke is on a distinguished road
Why density based? Are you solving forced or free convection?
If forced, solving flow and energy independantly does not help. Bouyancy is neglected by not activating gravity.

Regards
Luke
delaneyluke is offline   Reply With Quote

Old   July 30, 2013, 21:08
Default
  #3
New Member
 
preetam
Join Date: Feb 2012
Posts: 23
Rep Power: 5
preetam69 is on a distinguished road
Quote:
Originally Posted by delaneyluke View Post
Why density based? Are you solving forced or free convection?
If forced, solving flow and energy independantly does not help. Bouyancy is neglected by not activating gravity.

Regards
Luke
hi Luke, thnx for your reply.

this is a forced convection problem. i haven't activated gravity,so buoyancy is not activated.

but can you tell me how can i solve the energy equation separately without flow equations?

thnx in advance.
preetam69 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
Having Problem solving 2D supersonic flow around a plug nozzle chrislloyd FLUENT 7 July 22, 2015 13:09
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
flow solver - energy equation problem ufocfd Main CFD Forum 0 May 19, 2013 15:00
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
Viscosity and the Energy Equation Rich Main CFD Forum 0 December 16, 2009 15:01


All times are GMT -4. The time now is 00:48.