Simulate accumulation of dust in a fixed bed filter

_srs_ · November 2, 2015, 07:37

Hello everybody,

I want to simulate the accumulation of dust in a fixed bed filter. The filter itself is set up as porous medium. I have air as continuous fluid and for dust I use particle tracking. Now I want the particles (or some of them) to accumulate on the porous medium. But I didn´t find a way to set up conditions to make the particles “stick” within the porous medium.

I read in another post that a fortran sub routine is needed to solve this problem. But as I´m new in CFX I am searching for an easier way without using fortran.

I very appreciate your help

thanks

ghorrocks · November 2, 2015, 16:01

First of all - are you using an appropriate multiphase model? Is this model more easily done as a Eularian multiphase model? The removing dust in the filter is easy (just use a source term).

Assuming you want to use a Lagrangian particle model - have you looked at particle mass source terms?

_srs_ · November 3, 2015, 08:38

Thanks for your answer ghorroks,

as I wan´t so simulate particles with different sizes I use the particle transport model.

Sorry but what is a source term? Do you mean the defaults that I can select in CFX-Pre or is it a kind of fortran subroutine? I was searching in the help-funktion of CFX but I am still not sure about it.

ghorrocks · November 3, 2015, 17:23

Eularian models can also handle different sized particles. A simple way of doing it is to have multiple Eularian phase with different sizes in each, but more sophisticated ways of doing it are available including things like MUSIG.

I will refer you to a CFD text book for an explanation of source terms.

November 2, 2015, 07:37	Simulate accumulation of dust in a fixed bed filter	#1
_srs_ New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	Hello everybody, I want to simulate the accumulation of dust in a fixed bed filter. The filter itself is set up as porous medium. I have air as continuous fluid and for dust I use particle tracking. Now I want the particles (or some of them) to accumulate on the porous medium. But I didn´t find a way to set up conditions to make the particles “stick” within the porous medium. I read in another post that a fortran sub routine is needed to solve this problem. But as I´m new in CFX I am searching for an easier way without using fortran. I very appreciate your help thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Accumulating Dust on a Filter Cartridge	WalterW	CFX	21	May 26, 2020 06:23
how can use the LES filter? (laplace filter and anistropic filter)	ethan oh	OpenFOAM Running, Solving & CFD	11	December 26, 2018 02:37
simulate reverse flow for filter cleaning	Rashmi	FLUENT	2	January 13, 2007 06:38
powder accumulation of gassolid flow in packed bed	ben	CFX	0	July 3, 2006 21:37
Dust accumulation in duct	Ramana	CFX	0	October 27, 2005 04:15

November 2, 2015, 16:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	First of all - are you using an appropriate multiphase model? Is this model more easily done as a Eularian multiphase model? The removing dust in the filter is easy (just use a source term). Assuming you want to use a Lagrangian particle model - have you looked at particle mass source terms?

November 3, 2015, 08:38		#3
_srs_ New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	Thanks for your answer ghorroks, as I wan´t so simulate particles with different sizes I use the particle transport model. Sorry but what is a source term? Do you mean the defaults that I can select in CFX-Pre or is it a kind of fortran subroutine? I was searching in the help-funktion of CFX but I am still not sure about it.

November 3, 2015, 17:23		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Eularian models can also handle different sized particles. A simple way of doing it is to have multiple Eularian phase with different sizes in each, but more sophisticated ways of doing it are available including things like MUSIG. I will refer you to a CFD text book for an explanation of source terms.