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Particle tracing for fluid flow module: calculation of forces.
Posted 22 feb 2012, 04:06 GMT-5 Version 4.2a 1 Reply
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I am writing about the particle tracing for fluid flow module.
I'm simulating the transport of colloids in porous media.
My total domain has size 1200 x 1900 μm and I have recreated the grains of the porous medium with circles (one of radius 250 μm).
In my study there are forces (Van der Waals force and electric double layer force) acting between particles and grains of the porous medium. These forces are significantly different from zero only in a domain of a few tens of nm (near the porous medium grains).
I have implemented these forces as analytic functions and then I have used them in the particle tracing for fluid flow module in the section Force.
These forces (in particular the electric double layer force) have a non-monotonic trend but they have minimum and maximum in the narrow domain in which they act.
I wonder if Comsol, when calculates these forces, does it in an analytical way or if it calculates them only in the nodes and then interpolates.
In this last case, given that I can’t do a mesh so thick (size less than 10 nm), I fear that the trend of forces is not correctly recreated near the grains of the porous medium.
Thanks for reply,
Francesca
Hello Francesca Messina
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I'm thinking into doing something similar, I want to model the EDL around junus particles, although I know, I must made my model at nanometer scale, I don't know if it is possible. I haven't found any article that have made that for a lot of particles which is what I need. If you have found something please contact me.