# boundary conditions for cyclone separator

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

 June 11, 2010, 02:27 boundary conditions for cyclone separator #1 New Member   siddharth Join Date: Jun 2010 Posts: 7 Rep Power: 7 i am doing a gas-solid simulation of cyclone separator. In the solution i get the mass is not balanced. i have attached pics of the domain settings. can someone help me in showing where i went wrong or what is the correct settings? i have given a velocity inlet with both air and aluminium having 10m/s and air is 0.9 and aluminium is 0.1 volume fraction both overflow and underflow i have given pressure outlet with pressure of 0atm 1.jpg 2.JPG 3.JPG 4.JPG

 June 14, 2010, 18:20 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,941 Rep Power: 85 Please show your convergence results, and maybe post the CCL file.

 June 15, 2010, 03:07 #3 New Member   siddharth Join Date: Jun 2010 Posts: 7 Rep Power: 7 i have attached the ccl file Thanks in advance siddharth ----------------------------- cyclone_multiphase_v5_1.zip

 June 15, 2010, 06:53 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,941 Rep Power: 85 You are using a Reynolds Stress turbulence model. If you go to SST or some other more stable turbulence scheme it will be much more stable.

 June 15, 2010, 07:11 #5 New Member   siddharth Join Date: Jun 2010 Posts: 7 Rep Power: 7 but most of the journal i had studied suggested that Reynolds stress turbulence model is most suitable for cyclone separator Thanks siddharth

 June 15, 2010, 07:18 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,941 Rep Power: 85 It is, but it will make convergence extremely difficult. Get the basic model working with SST. Once everything is working with SST then switch back to RSM. Also keep in mind that multiphase modelling introduces large simplifications. These simplifications can swamp the extra accuracy gained by RSM models. So if you have a have heavy multiphase interaction then I probably would not bother with RSM at all.

 June 15, 2010, 07:53 #7 New Member   siddharth Join Date: Jun 2010 Posts: 7 Rep Power: 7 will look into it. I have one more doubt. In the basic settings of the Domain -- Air is the continuous fluid. what should i define aluminium? cause i am confused in giving it as continuous fluid or dispersed solid or particle transport solid. Thanks siddharth

 June 15, 2010, 08:01 #8 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,941 Rep Power: 85 For a full answer to that question do a multiphase modelling course. The quick answer is - light particle loadings - use particle tracking, heavy particle loadings use a Eularian approach.

 Tags cfx, cyclones separator

 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 Anindya Main CFD Forum 24 January 11, 2012 14:40 vaina74 Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 May 27, 2010 09:38 Lionel S. Main CFD Forum 1 August 24, 2007 18:03 michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15 lyang Main CFD Forum 0 September 19, 1999 18:29

All times are GMT -4. The time now is 05:09.