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Old   July 12, 2012, 08:19
Default cfx post- two phase flow- particle size distribution
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hari
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hello all,
i am doing two phase flow steady state simulation (spray drying process) in cfx. my questions are
1) How to see the data of each single particle like moisture content , residence time ,velocity, temperature..etc..in cfx post
2)and also i would like to plot the size distribution of particles after drying process in cfx post..how can i do that..?

please help me...if any one knows
thanks
hari
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Old   July 12, 2012, 18:47
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Glenn Horrocks
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Have a look at the CFX tutorials. There is some which do particle tracking so they will give some ideas on how to post process them.
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Old   July 13, 2012, 08:32
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Quote:
Originally Posted by ghorrocks View Post
Have a look at the CFX tutorials. There is some which do particle tracking so they will give some ideas on how to post process them.
thanks for your reply Glenn
actually i am doing simulation in cfx with a 9 degree section of my full geometry.
1)firstly i have full doubt about that how to check whether we got proper results after simulation ?
2) is it necessary to perform grid independence test..? because i have done some basic steady state simulation with 25000, 45000, 65000,90000 elements mesh..i have compared the velocity profile at particular location(line in radial direction) which shows agree with some % of error..but when i used fine mesh its not able to get converged and some times it displaying wall has been placed at outlet boundary
so my question is that should i go for fine mesh or any coarser mesh also fine to perform my simulation..how to choose mesh size?
3) what it means if domain imbalance comes as negative ?

and also can u please suggest me if possible the tutorial that which has covered that particle tracking in post process...?
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Old   July 14, 2012, 05:23
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1. This series of FAQs concentrates on inaccuracies, but the discussion will be of use: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
2. It is common to have problems with convergence in finer meshes. If you have already shown that your answer is good within an acceptable accuracy then you should be OK.
3. Negative/positive just means there is a +/- mass/momentum/heat imbalance across the domain.
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