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

What is UDS diffusivity of a self-defined material?

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 5, 2011, 22:08
Default What is UDS diffusivity of a self-defined material?
Join Date: Mar 2011
Posts: 38
Rep Power: 15
aleisia is on a distinguished road
Since the properties of my contaminant material are not in the fluent database, I created it.

The properties I found from different online sources and literature are: molecular weight, isobaric specific heat Cp, viscosity, diffusivity and density.

When I tried to choose these five properties, for diffusivity, there are only two: diffusivity in solid or UDS diffusivity, I had no choice but to choose the latter, even though I don't know what it is. then I defined this material, add it to air (air is in the bottom of the mixture I defined, as it is the bulk fluid) and I defined this gaseous mixture. then I looked at the properties of this mixture, I found that somehow fluent set a thermal conductivity (0.045W/mK) for me and a diffusivity 2.088*10^(-5), while my real contaminant diffusivity in air is 5.52*10^(-6), which I already input as UDS diffusivity.

Anyway, I changed this mixture diffusivity back to 5.52*10^(-6) m^2/s and saved this material. Am I doing this right? or I have to define this UDS transport equation? I've no idea about it right now.

And the thermal conductivity, I didn't input it, it was "determined" by fluent somehow, do you know why?

aleisia is offline   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
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 05:21
PEM modeling UDS diffusivity in mixture gemini FLUENT 6 August 7, 2012 07:37
OpenFOAM static build on Cray XT5 asaijo OpenFOAM Installation 9 April 6, 2011 12:21
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02

All times are GMT -4. The time now is 05:37.