Particle Tracking for ion

Jun · August 30, 2010, 11:01

Hi all:

I am trying to use particle tracking on ion in the electrolyte, to see the behavior of ion.

I used particle transport solid, one-way coupling, Schiller Naumann for drag force, one uniform particle diameter.

The problem is that when the particle size is very small (~10e-10 meter), there are not tracks display in the CFX-POST, when the particle size is set to ~10e-4 meter, the particle tracks are available to display.

My question is if it is possible to use CFX particle tracking to model the very small size particle.
If the answer is yes, anybody please points out the right way for me to do it?
If the answer is no, what is the other option to model such small particle in the fluid?

Thanks.

Jun

ghorrocks · August 30, 2010, 19:58

No, this does not sound sensible. The forces on an atomic/ionic scale are very different to the micron and larger scale. For instance there is no viscous drag on an atom, it is just the inter-atomic forces. You cannot use particle tracks to do what you say without removing all the drag law stuff and replacing it with atomic interaction stuff.

Jun · August 31, 2010, 09:19

Thank you for your reply, Glenn.

You are right. After more study, I realized that one possible way to do it is my own defined force on the atom through Fortran function.

Hope this will help others.

August 30, 2010, 11:01	Particle Tracking for ion	#1
Jun New Member Jun Join Date: Aug 2010 Posts: 12 Rep Power: 16	Hi all: I am trying to use particle tracking on ion in the electrolyte, to see the behavior of ion. I used particle transport solid, one-way coupling, Schiller Naumann for drag force, one uniform particle diameter. The problem is that when the particle size is very small (~10e-10 meter), there are not tracks display in the CFX-POST, when the particle size is set to ~10e-4 meter, the particle tracks are available to display. My question is if it is possible to use CFX particle tracking to model the very small size particle. If the answer is yes, anybody please points out the right way for me to do it? If the answer is no, what is the other option to model such small particle in the fluid? Thanks. Jun

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August 30, 2010, 19:58		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,862 Rep Power: 144	No, this does not sound sensible. The forces on an atomic/ionic scale are very different to the micron and larger scale. For instance there is no viscous drag on an atom, it is just the inter-atomic forces. You cannot use particle tracks to do what you say without removing all the drag law stuff and replacing it with atomic interaction stuff.

August 31, 2010, 09:19		#3
Jun New Member Jun Join Date: Aug 2010 Posts: 12 Rep Power: 16	Thank you for your reply, Glenn. You are right. After more study, I realized that one possible way to do it is my own defined force on the atom through Fortran function. Hope this will help others.