Can any of the openfoam CFD solver be used for nano-scale geometry modelling?

xbchen168 · April 27, 2012, 02:29

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, 04:09

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, 06:03

u said it. thanks!!!!!!!!

alberto · April 28, 2012, 03:14

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,

April 27, 2012, 02:29	Can any of the openfoam CFD solver be used for nano-scale geometry modelling?	#1
xbchen168 New Member Chen Xiaobing Join Date: Aug 2011 Posts: 11 Rep Power: 15	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.

April 27, 2012, 06:03	thanks`	#3
xbchen168 New Member Chen Xiaobing Join Date: Aug 2011 Posts: 11 Rep Power: 15	u said it. thanks!!!!!!!!

April 28, 2012, 03:14		#4
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	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, __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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April 27, 2012, 04:09		#2
mvoss Senior Member Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 449 Rep Power: 20	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