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Forum: FLUENT June 21, 2011, 03:14
Replies: 25
Views: 4,420
Posted By flanker1
particle_tracking

In case of Brownian force it is important to compare the time step with the relaxation time, because the distribution from which we select the random force is different in the two cases (dt<<tau and...
Forum: FLUENT February 4, 2011, 10:55
Replies: 25
Views: 4,420
Posted By flanker1
Maybe try to use an earlier version and see...

Maybe try to use an earlier version and see wether the problem persists or not.
Forum: FLUENT February 4, 2011, 10:53
Replies: 25
Views: 4,420
Posted By flanker1
Then you should contact FLUENT (ANSYS) helpdesk...

Then you should contact FLUENT (ANSYS) helpdesk and report the bug.
In an earlier version (6.1.18 I think) there was a bug like if the particle diameter was less than 0.01 micron than it evaporated....
Forum: FLUENT February 4, 2011, 10:05
Replies: 25
Views: 4,420
Posted By flanker1
OK. Have you tried to switch to another tracking...

OK. Have you tried to switch to another tracking scheme. I don't know which version are you using, but in the newer versions there is a possibility to select from different schemes (e.g. trapezoidal,...
Forum: FLUENT February 4, 2011, 09:08
Replies: 25
Views: 4,420
Posted By flanker1
Do you use the original formula for the brownian...

Do you use the original formula for the brownian force? (eq. 21.2-18 in FLUENT documentation)
Forum: FLUENT February 4, 2011, 08:02
Replies: 25
Views: 4,420
Posted By flanker1
And what was the problem with FLUENT particle...

And what was the problem with FLUENT particle tracking during the first time step?
Forum: FLUENT February 4, 2011, 07:46
Replies: 25
Views: 4,420
Posted By flanker1
I perfectly agree with you! Actually, this was...

I perfectly agree with you! Actually, this was the reason (relaxation times) why I wanted to implement my own Brownian motion UDF. I had long discussions with developers, but they simply did not...
Forum: FLUENT February 4, 2011, 03:34
Replies: 25
Views: 4,420
Posted By flanker1
tracking

I am not sure wether I understand it well, but as far as I know the only way to influence particle trajectory is through the setable parameters and body forces, but not using another numerical...
Forum: FLUENT February 3, 2011, 14:08
Replies: 25
Views: 4,420
Posted By flanker1
Could you please provide a copy of your UDF to...

Could you please provide a copy of your UDF to see what the problem could be?
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