CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

compressibleTwoPhaseEulerFoam: order of the alpha-setup makes a difference

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

LinkBack Thread Tools Display Modes
Old   August 30, 2013, 08:38
Default compressibleTwoPhaseEulerFoam: order of the alpha-setup makes a difference
New Member
Join Date: Apr 2012
Posts: 7
Rep Power: 5
Benedikt is on a distinguished road
Hello everybody.
I try to simulate an air stream with waterdroplets into an air-filled volume. Therefore I edited the bubbleColumn and the fluidizedBed tutorials to my needs, but the result was not satisfying. So I made a few testcases and found a strange behaviour.
I set up a case with 2 identical phases. They have the same thermophysicalProperties and the same transportProperties. The velocity is the same as well. The despersedPhase is set to both. So I varied the alpha. At first alphaair was 1 in the internalField and 0 in the inlet. In the second case it was just the other way round, alphaair was 0 in the internalField and 1 in the inlet.
I expected to see the same result, because the two phases have exactly the same properties. But to my surprise alpha and u behaved differently. Not completely different, but significant.
I digged around in the sourcecode but couldn't find any explanation.
Could anyone give me a hint why the two cases react differently?
If you want to have a look at the cases, here the zipped cases (in zip or tar format):
Of course you have to compare alphaair of one case with alphawater with the other case.
I would appreciate any hint
Benedikt is offline   Reply With Quote


alpha, twophaseeulerfoam

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
pathline difference in fan for 1 order and 2 order scheme tongnan FLUENT 1 August 27, 2013 15:31
Is the order of spatial difference can be improved liqiang Main CFD Forum 1 April 10, 2005 10:24
Higher order discretization on staggered grid Chandra Shekhar Main CFD Forum 9 January 27, 2005 17:31
High order compact finite difference Mikhail Main CFD Forum 3 February 16, 2004 00:31
High order compact finite difference schemes Mikhail Main CFD Forum 6 August 5, 2003 10:36

All times are GMT -4. The time now is 01:29.