CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

buoyantPimpleFoam with thermalBaffle1D: strange temperature decrease

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 14, 2014, 20:30
Default buoyantPimpleFoam with thermalBaffle1D: strange temperature decrease
  #1
New Member
 
Al
Join Date: Jul 2013
Posts: 29
Blog Entries: 1
Rep Power: 4
donQi is on a distinguished road
I took the pimpleDyMFoam/propeller tutorial and added a 1D thermal baffle with Qs uniform 1000;
I launched the analysis with buoyantSimpleFoam: it converges after 1189 iterations and the maximum temperature as expected increases from 273K to 339.4K.
Then I took the 1189 time as starting point for buoyantPimpleFoam with the propeller stopped to see how much the temperature increases when there is only natural convection. But the temperature in less then 0.2s decrease from 339.4K to 328.4K. I wonder if this is linked to a bug?

I upload the files here:
https://www.dropbox.com/sh/gj602mpsi...E8bKzHkVcSS9aa
What I did is:
- took the pimpleDyMFoam/propeller
- added in front of the propeller a 1D thermal baffle like in the circuitBoardCooling tutorial
- switched from AMI to MRF approach to be able to launch it with buoyantSimpleFoam
- took the last time directory of the converged analysis and use it as starting point for the buoyantPimpleFoam analysis
- commented in fvOptions the MRF subdictionary (propeller not rotating)
- launched buoyantPimpleFoam for 0.2sec, temperature will decrease from 339.4K to 328.4K.

do you have any suggestions to solve this strange temperature behaviour?
donQi 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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Free stream temperature saharesobh FLUENT 1 October 11, 2012 20:52
sharp temperature decrease near the wall dace CFX 0 January 28, 2009 09:23
High temperature methane+air Peter FLUENT 5 January 26, 2009 19:04
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07


All times are GMT -4. The time now is 06:29.