CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Grid dependency study in building heat transfer

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 10, 2013, 14:20
Smile Grid dependency study in building heat transfer
  #1
Senior Member
 
sunilpatil's Avatar
 
sunil
Join Date: Jul 2012
Location: Bangalore
Posts: 179
Rep Power: 13
sunilpatil is on a distinguished road
Hello sir,
I am doing my M Tech Project on building heat transfer.i have considered single room of dimensions 4*4*4 m.i am applying heat flux to the walls heat flux is varying with time.i have to run my simulation for 24 hours(Total time = 86400 s) my question is for grid dependency study either i have to very both time step size and grid size(space and time) or any one of them is enough because it takes too much of computational time even for time step of 10 s to solve for given total time
Results which i am interested are
1.Average room temperature
2.avg wall temperature

Thank you sir
sunilpatil is offline   Reply With Quote

Old   April 10, 2013, 17:17
Default
  #2
Member
 
Dmitry
Join Date: Nov 2011
Posts: 45
Rep Power: 14
imnull is on a distinguished road
Quote:
Originally Posted by sunilpatil View Post
Hello sir,
I am doing my M Tech Project on building heat transfer.i have considered single room of dimensions 4*4*4 m.i am applying heat flux to the walls heat flux is varying with time.i have to run my simulation for 24 hours(Total time = 86400 s) my question is for grid dependency study either i have to very both time step size and grid size(space and time) or any one of them is enough because it takes too much of computational time even for time step of 10 s to solve for given total time
Results which i am interested are
1.Average room temperature
2.avg wall temperature

Thank you sir
see attached
user54862_pic391_1340124620.jpg
imnull is offline   Reply With Quote

Old   April 10, 2013, 22:00
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
This is why I strongly recommend using adaptive timestepping. Set adaptive time stepping to home in on 3-5 coeff loops per iteration, then yoru timestep is automatically calculated and you have one less variable to do a sensitivity analysis on.
ghorrocks is offline   Reply With Quote

Old   April 11, 2013, 03:10
Smile Grid dependency
  #4
Senior Member
 
sunilpatil's Avatar
 
sunil
Join Date: Jul 2012
Location: Bangalore
Posts: 179
Rep Power: 13
sunilpatil is on a distinguished road
Hello sir,
Thank you for reply. i will try to run solver with adaptive time stepping as you suggested
Thank you sir
Sunil Patil
sunilpatil is offline   Reply With Quote

Old   April 11, 2013, 10:26
Default
  #5
Senior Member
 
JuPa's Avatar
 
Mr CFD
Join Date: Jun 2012
Location: Britain
Posts: 361
Rep Power: 14
JuPa is on a distinguished road
Quote:
Originally Posted by imnull View Post
see attached
Attachment 20646
Hi,

Where did you get the presentation from? What's the title of the presentation?

Thanks
JuPa is offline   Reply With Quote

Reply

Tags
building heat transfer, grid dependency, transient analysis

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Heat transfer (conduction) between two pipes shields FLUENT 14 February 3, 2016 08:45
Radiation interface hinca CFX 15 January 26, 2014 18:11
Heat transfer from a heated plate using fins pathakamit FLUENT 1 April 30, 2013 05:07
Grid Independent Solution Chuck Leakeas Main CFD Forum 2 May 26, 2000 12:18
heat transfer prediction. ranjeet Main CFD Forum 6 September 1, 1999 07:41


All times are GMT -4. The time now is 07:57.