CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

An issue with temperature change in unsteady prob

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 29, 2008, 05:26
Default An issue with temperature change in unsteady prob
Ashok kumar
Posts: n/a
Hi All I've an oil pipe with a 90 degree branching in between the pipe. The sensor assembly locates in the branching zone. Surrounding the pipe branching, there is air flow to cool the branching region. The initial temperature of the solid components inside the sensor assembly will be 360 K whereas the air temperature is 296 K. The infusing temperature of the oil is 423 K and the aim of the simulation is to find the time when the components of the sensor assembly will reach the temperature of the oil.

There is a temperature rise on each component only for the I time step. When the solution converges for the I time step and from the II time step the temperature is getting stabilized. I don't see further increase in the temperature of the components in the later time steps. According to experimental data the components reach the maximum temperature at 160 secs and the time step what I taken is only 2 secs and 85 time steps.

Also to my problem following is how I've initialized the case.

Initialize all zones with 0 gauge pressure and 296 K Patch oil domain with 423 K Patch solid components with 360 K Monitoring volume average temperature for solids inside sensor assembly

Requesting help.

regards Ashok

  Reply With Quote

Old   January 13, 2009, 04:34
Default Re: An issue with temperature change in unsteady p
Posts: n/a
Do you have a developed flow in the pipe and outside before analysing the temperatures? how do you impose the flows in the pipe and outside?

how are the initial conditions of your experiments? is the pipe full of flowing oil?
  Reply With Quote


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
unsteady flow convergence issue Jason FLUENT 2 August 20, 2008 08:11
test prob for 2D unsteady navier stokes equation Shah Main CFD Forum 5 April 20, 2007 07:25
prob. with unsteady RANS using Finite Rate Chem James FLUENT 4 May 16, 2006 06:29
Writing UDF for Unsteady Temperature change ? Baggi FLUENT 0 April 12, 2006 17:27
Time scales and Fluent's unsteady solver issue Freeman FLUENT 6 December 13, 2005 14:30

All times are GMT -4. The time now is 04:27.