permeability parameters

pato · March 5, 2012, 10:16

Hi
I´m simulating porous media. First of all i didn´t put any value for permeability or resistance loss coefficient, having the process a good convergence.
When changing the permeability parameter, it is much more difficult to get convergence, having floating point problem. MY question is, what value does the solver take when i don´t put any value in the box of permeability?and for resistance loss coefficient?
that would help me to see in what range of values the model has good convergence.

thanxx

ghorrocks · March 5, 2012, 17:24

I do not know. If you look in the <CFX_ROOT>/etc/VARIABLES you might get some information about limits and other restrictions.

Other than that, I would just recommend sweeping a range of permeabilities and finding out for your self what works and what does not.

March 5, 2012, 10:16	permeability parameters	#1
pato Member albert Join Date: Jan 2012 Posts: 31 Rep Power: 14	Hi I´m simulating porous media. First of all i didn´t put any value for permeability or resistance loss coefficient, having the process a good convergence. When changing the permeability parameter, it is much more difficult to get convergence, having floating point problem. MY question is, what value does the solver take when i don´t put any value in the box of permeability?and for resistance loss coefficient? that would help me to see in what range of values the model has good convergence. thanxx

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March 5, 2012, 17:24		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	I do not know. If you look in the <CFX_ROOT>/etc/VARIABLES you might get some information about limits and other restrictions. Other than that, I would just recommend sweeping a range of permeabilities and finding out for your self what works and what does not.