CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Marking sections of fluid with temperature.

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

LinkBack Thread Tools Display Modes
Old   May 16, 2016, 12:27
Default Marking sections of fluid with temperature.
New Member
dab bence
Join Date: Mar 2013
Posts: 13
Rep Power: 6
danbence is on a distinguished road
Sponsored Links
In order to visualise a volume of interest through the domain of a transient simulation, I have tried to use temperature as a marker. I set the thermal conductivity of air to be practically zero and wrote a UDF to initialise the volume of interest with one temperature and the rest of the domain with a second temperature. I also used a very fine mesh, in order to minimise the smear of temperature caused by the discretization.

To my great surprise, after one small timestep, the hard transition between the two temperatures has been spread/smeared out by orders of magnitude greater distance than the thermal conductivity would allow.

Is my methodology flawed ? My guess is that even though it is a transient simulation with a small time step, the solver is trying to solve the temperature from the boundary conditions instead of being faithful to the initialisation temperatures.

I will probably swap to using particle tracking, but it has shaken my faith that fluent will properly represent the physics of the mixing of different temperature liquids.
danbence is offline   Reply With Quote
Sponsored Links


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
libOpenSMOKE Tobi OpenFOAM Programming & Development 520 June 13, 2017 08:41
is internalField(U) equivalent to zeroGradient? immortality OpenFOAM Running, Solving & CFD 7 March 29, 2013 02:27
define temperature fluid at the inlet papteo OpenFOAM Pre-Processing 0 March 28, 2013 07:37
Temperature Profile through a fluid solid interface Studentdrak CFX 4 January 31, 2012 23:23
plot bulk temperature of fluid mohammadkm FLUENT 4 December 13, 2011 16:37

Sponsored Links

All times are GMT -4. The time now is 20:37.