# Porous media in openfoam

 Register Blogs Members List Search Today's Posts Mark Forums Read

December 21, 2010, 08:56
Mutiphase_Eulerian_Eulerain_porous media
#21
Member

Subhasish Mitra
Join Date: Oct 2009
Location: Australia
Posts: 54
Rep Power: 8
Hi Arturo,

I'm stuck at a packed bed simulation in Fluent. The packed bed model is represented by air/water streams in porous media in Eulerian framework.

I aim at my model to predict pressure drop and liquid volume fraction in the bed.

Kindly let me know,

1) Is viscous resistance needs to be entered for both phase? I've calculated this resistance (1/m2) by Ergun Equation for single phase. But how do we account for two phase here?

I've used "Schiller Naumann" drag law to calculate "interphase coupling" considering 5 mm water bubble dia.

Do you feel it necessary to introduce two momentum source terms instead of entering viscous/inertial resistance?

A technical reply will be highly appreciated.

Regards,

SM

Quote:
 Originally Posted by arturo BTW I work also with multiphase flows on porous media. Thnx Arturo

 December 21, 2010, 20:19 #22 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,895 Rep Power: 26 FLUENT Eulerian packed bed model can be seen as a three-phase Euler-Euler model, where one phase has zero velocity, and represents the porous zone. This makes things a bit easier, since you automatically have sum(vol. Fraction) = 1. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as live DVD/USB, hard drive image and virtual image. OpenQBMM - An open-source implementation of quadrature-based moment methods

December 22, 2010, 01:49
fluent_porous media_packed_bed
#23
Member

Subhasish Mitra
Join Date: Oct 2009
Location: Australia
Posts: 54
Rep Power: 8
Hi Alberto,

Thanks for your reply. I've implemented 3 phase E-E model in Fluent, patching solid phase with constant packing factor 0.63 in the computational domain. But this 3 phase strategy is really computationally expensive and time consuming.

All I'm looking at is replacing the solid phase with "porous media" incorporating the suitable momentum sink terms in 2 phase E-E simulation. This saves time yet gives reasonable accuracy.

Any technical suggestion is more than welcome.

Regards,

SM

Quote:
 Originally Posted by alberto FLUENT Eulerian packed bed model can be seen as a three-phase Euler-Euler model, where one phase has zero velocity, and represents the porous zone. This makes things a bit easier, since you automatically have sum(vol. Fraction) = 1.

 December 22, 2010, 16:08 #24 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,895 Rep Power: 26 I don't see why it is so much more computationally expensive of the two-phase simulation you have to run anyway, since you are not solving for the particle phase (it has constant zero velocity and constant volume fraction). The proper momentum sink is given by the drag coefficient, which should be based on the Ergun law for the phase pairs involving the porous zone. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as live DVD/USB, hard drive image and virtual image. OpenQBMM - An open-source implementation of quadrature-based moment methods

 February 1, 2011, 21:58 #25 New Member   Oky Andytya Join Date: Nov 2010 Posts: 26 Rep Power: 7 Hi everyone, I'm trying simulation porous media in rectangular channel, but the result isn't suitable with any research. So, would you help me. I wish someone can check my simulation and give some reports if there is something wrong. Thank you for your help. Please send your e-mail, than i will send you my works to to your email. my e-mail: oky.andytya.net@gmail.com Regrads, OKY Andytya P note: I use ANSYS Fluent 6.3 [CFD]

 February 2, 2011, 02:43 #26 Senior Member   Dr. Alexander Vakhrushev Join Date: Mar 2009 Posts: 214 Rep Power: 10 Oky, 1E+06 \$ please __________________ Best regards, Dr. Alexander VAKHRUSHEV Christian Doppler Laboratory for "Advanced Process Simulation of Solidification and Melting" Simulation and Modelling of Metallurgical Processes Department of Metallurgy University of Leoben Franz-Josef-Str. 18 A - 8700 Leoben Österreich / Austria Tel.: +43 3842 - 402 - 3125 http://smmp.unileoben.ac.at

 February 17, 2011, 22:57 #27 New Member   Oky Andytya Join Date: Nov 2010 Posts: 26 Rep Power: 7 To: Dr. Alexander VAKHRUSHEV I have been visited the website and make some contact. Theres is a problem with the address. Would you like give your personal e-mail / website, because it's very helpfull. Tjanh you. Regrads Oky Andytya oky.andytya.net@gmail.com

May 24, 2011, 10:54
help in modeling compressible flow through porous media with heat transfer
#28
New Member

Manoj L Das
Join Date: Mar 2011
Location: Calcutta, India
Posts: 25
Rep Power: 6
Quote:
 Originally Posted by hjasak Hi, I have done a number of porous media flow model implementations, including scalar or tensorial resistance, using Darcy's law. They were typically a part of more complex model, like for example the biscuit baking model (mass transfer for air, liquid water and water vapour + heat transfer + stress analysis with large deformations) or similar complex heat/mass transfer models. In these cases, the flow equations lose the momentum term and you can solve them just by solving for pressure. Currently, there's no top-level example code for porous media, because it's "too simple" and interesting only with some other phenomena. Hrv

Hi Hrv,

I was looking for some help in modeling compressible flow in porous media, and to me you seem to be a senior member in this field. i would appreciate any help in this regard, if it does distract you from your schedule, I would understand,

In my problem I hava a vertical cylindrical domain and the complete domain is filled with porous media of porosity 0.6. Air inters to the domain at a velocity of 0.3 Mach no. and temp of 1000 degree centigrade, through 18 thin pipes mounted circumferentially at the side. and Air comes out from the top of the cylinder after passing through the porous media.

Actually I was facing problem in definig a porous zone on a tetrahedral mesh which I imported to discretize-setup as a *.stl import from star-CD mesh file. Also the imported mesh shows an extra patch "patch0", which has 0 face, and the rhoPorousSimpleFoam solver complains about this patch 0, and gives fatal error.

Please help me in getting some way to overcome this error. Also I would be grateful if you could suggest a solver for such kind of problems.

Regards,

MLD

 May 24, 2011, 23:06 #29 New Member   Oky Andytya Join Date: Nov 2010 Posts: 26 Rep Power: 7 Hi, everyone How to get the value of convection coefficient [h] from Fluent directly ?? Regrads, Oky

March 15, 2013, 19:25
chemical reaction into porous media openfoam
#30
New Member

SETTAR
Join Date: Sep 2012
Posts: 11
Rep Power: 5
Quote:
 Originally Posted by arturo My main interest are chemical reactions and other physics on porous media, the so called packed bed reactors, so many other phenomena must be accounted for such as heat transfer, chemical reaction and mass transfer, its good to know that OpenFoam can tackle those cases. Thanks for the answer and I hope I can post my questions if stucked. Thanks to all Arturo
hello, i'm new with openfoam and i'm using only the tutorials but for my preoblem i need a chemical reaction into a porous media so how can i do that like you did ?

 March 16, 2013, 16:23 #31 New Member   Santiago Lopez Castano Join Date: Nov 2012 Posts: 13 Rep Power: 5 Have you checked porousSimpleFoam?

 March 16, 2013, 17:07 #32 New Member   SETTAR Join Date: Sep 2012 Posts: 11 Rep Power: 5 yeah but there is not chemical reaction in porousSimpleFoam how can i modify

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post gac OpenFOAM Running, Solving & CFD 21 August 5, 2013 17:49 Sean Cody FLUENT 8 March 6, 2013 11:33 Isi Main CFD Forum 1 July 14, 2008 07:18 Kurt Malinski FLUENT 3 September 13, 2004 12:31 Jan CD-adapco 0 June 8, 2002 09:23

All times are GMT -4. The time now is 03:37.