CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Bugs

Particles are not hitting the wall

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 7, 2014, 12:52
Default Particles deflected by surface defined as stick
  #21
New Member
 
Michael
Join Date: Dec 2011
Location: Geneva
Posts: 28
Rep Power: 8
lithos is on a distinguished road
Dear all,

I'd like to add an incident to this thread as it seems to be a similar problem. The cases concerned introduce parcels into a thermal plume. This flow "hits" a bend surface. Different aerodynamic diameters have been used, i.e. 1e-4, 1e-5 and 1e-6.
I used paraview to animate the flow of the parcels and it seems that they are deflected from the wall, see (10 and 50 MB file size; red particles are active = flowing, blue are stick)

https://box.cern.ch/public.php?servi...1933015dd82303

and

https://box.cern.ch/public.php?servi...519d51c73f7e33

This surface is definitely set to stick,
Code:
            {
                type        stick;
            }
and for some particle diameters it works, for some it does not (see attached screenhots). CheckMesh seems fine with the tets, log file attached as well

Does anybody of you have an idea what is (not) going on there? Is a certain mesh resolution necessary depending on a parcel size? Could this be a scheme or solution problem (both attached)?

OpenFOAM version is 2.2.x-5cc33a231685. Solver used is fireFoam version 70b3e6a20900683fba46801c31725a9197954ecb.

Thanks in advance for any kind of help.

Cheers,

Michael
Attached Images
File Type: jpg 1e-4.jpg (27.5 KB, 17 views)
File Type: jpg 1e-5.jpg (30.0 KB, 13 views)
File Type: jpg 1e-6.jpg (32.0 KB, 15 views)
Attached Files
File Type: txt log.checkMesh-allGeometry.txt (7.1 KB, 1 views)
File Type: zip fvSchemeSolution.zip (1.8 KB, 2 views)
lithos is offline   Reply With Quote

Old   June 2, 2015, 04:33
Default
  #22
Member
 
luchen
Join Date: Jul 2011
Posts: 44
Rep Power: 8
luchen2408 is on a distinguished road
hello, my test simulation also shows that the partiles will stick to the all and will flow along the wall for a long distance. beside, the gravity doesn't act on the particles. is there any suggestion to solve the problems?
luchen2408 is offline   Reply With Quote

Old   May 19, 2016, 06:04
Default
  #23
Senior Member
 
Albrecht vBoetticher
Join Date: Aug 2010
Location: Zürich, Swizerland
Posts: 218
Rep Power: 10
vonboett is on a distinguished road
Yust an idea: did you make shure that your maxInteractionDistance is larger than your max. particle diameter?
vonboett is offline   Reply With Quote

Old   May 19, 2016, 20:29
Default
  #24
Member
 
luchen
Join Date: Jul 2011
Posts: 44
Rep Power: 8
luchen2408 is on a distinguished road
Yes, I think so, now the gravity act on the particles.
luchen2408 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fluent3DMeshToFoam simvun OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 48 May 14, 2012 05:20
Particles do not hit the wall CedricVH OpenFOAM 0 April 15, 2010 08:21
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug unoder OpenFOAM Installation 11 January 30, 2008 21:30
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12
Near wall particles Staffan FLUENT 2 October 2, 2000 08:47


All times are GMT -4. The time now is 09:49.