CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Differents fluids separated by wall

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

LinkBack Thread Tools Display Modes
Old   January 18, 2007, 03:43
Default Differents fluids separated by wall
Posts: n/a
Hello everyone,

I have different fluids (lets says a dozen!), all of them separated by a wall. So I have 12 fluids separated by 11 wall. There is heat exchange in these 11 walls.

The fluids are totally differents : water, oil, anything you want... and I want to use gravity. At this step, I have a first issue : (1) I can't define different operating density for each fluid, can I ?

Now one of these 12 fluids requires "solidification/melting" because there is a phase change at 330K. For this fluid there is no velocity inlet and outflow, this fluid can't go away, there is only walls around it.

I need "gravity" to compute natural convection in the liquid phase. If I want to use the Boussinesq hypothesis, I redefine the material, and I give a value for the Boussinesq density, and the thermal expansion coefficient "beta" (so the operating density will not apply for this fluid, am I right ?)

But now, I have an issue when I use Boussinesq with solidification/melting, I can give only one value for the density. But the density of the solid phase is not the same than the liquid phase (there is 10% volume expansion between liquid/solid) !!!

(2) Is there no way to use Boussinesq for the liquid phase, and a different density for the solid phase ?

Can anyone insure me that it is not possible to do that with fluent ? or tell me if I missed something...

Thanx a lot.
  Reply With Quote


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
UDF to Access Wall Normal Concentration Gradient Daniel Tanner Fluent UDF and Scheme Programming 4 February 18, 2015 15:35
tmerge utility creates unwanted interface/walls comes in the final mesh OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 11 January 20, 2012 07:23
natural convection mehrdadeng CFX 10 February 25, 2011 06:25
Tomiyama wall lubrication force Edy OpenFOAM 10 December 13, 2010 12:41
Influece of wall velocity in the main flow marvin CFX 0 March 22, 2008 03:05

All times are GMT -4. The time now is 00:44.