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-   -   Can any of the openfoam CFD solver be used for nano-scale geometry modelling? (http://www.cfd-online.com/Forums/openfoam-solving/100560-can-any-openfoam-cfd-solver-used-nano-scale-geometry-modelling.html)

xbchen168 April 27, 2012 01:29

Can any of the openfoam CFD solver be used for nano-scale geometry modelling?
 
For the nano-scale flow, e.g., water, can CFD still be valid? The geometry scale is 100 nm.

I just tried, the CFD solvers in openfoam just gave random/unreasonable flow pattern results and it seems un-converged.

Thanks.

mvoss April 27, 2012 03:09

Check for the Knudsen number Kn. I suppose you are out of range for continuum mechanics. But strange results often appear because of bad bc.

Good luck!

neewbie

xbchen168 April 27, 2012 05:03

thanks`
 
u said it. thanks!!!!!!!!

alberto April 28, 2012 02:14

For high-Knudsen number flows in nanochannels you can use DSMC or MD solvers, which OpenFOAM provides. If you need a continuum treatment, you might want to consider alternative approaches like moment methods or Lattice-Boltzmann.

Best,


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