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

Discretization schemes of Comsol stationary solver

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 13, 2014, 10:10
Question Discretization schemes of Comsol stationary solver
  #1
Member
 
Sami
Join Date: Nov 2012
Location: Cap Town, South Africa
Posts: 87
Rep Power: 14
Mehrez is on a distinguished road
Hi,
I would like to ask you how can I see what are the discretization schemes that a Comsol solver uses.
This information is of great importance for any numerical study but Comsol doesn't show this !
Thank you in advance.
PS: references are welcome
Mehrez
Mehrez is offline   Reply With Quote

Old   January 17, 2016, 09:57
Default
  #2
New Member
 
Join Date: Jan 2016
Posts: 2
Rep Power: 0
M.Taghizadeh is on a distinguished road
To display this section, click the Show button and select Discretization. It controls the
discretization (the element types used in the finite element formulation). From the Discretization of fluids list select the element order for the velocity components and the
pressure: P1+P1 (the default), P2+P1, or P3+P2.

! P2+P1 means that second order discretization for velocity field and first order discretization for pressure
M.Taghizadeh is offline   Reply With Quote

Old   January 17, 2016, 10:18
Default A new problem with discretization with comsol
  #3
New Member
 
Join Date: Jan 2016
Posts: 2
Rep Power: 0
M.Taghizadeh is on a distinguished road
i have another problem with discretization with comsol:
i use a SST scheme for a 3d geometry(sth like a tube with diameter of 30 mm and length of about 150 mm) every thing goes well for first order discretization type(P1+P1)and it converges up to 1e-5 with a relaxation factor about 0.5
BUT the problem begins when i want to solve the same problem with a second order discretization for the velocity field(P2+P1)!
the software default discretization type is (P1+P1) and it has also mentioned that second order discretization for physics other than creeping flow will encounter with convergance problem and second order discretization will be suitable just for creeping flows.
NOW
i wanted to know whether a first order discretization will have enough accuracy or i have to deal the problem with second order discretization ???
Thanks in Advance!
M.Taghizadeh is offline   Reply With Quote

Reply

Tags
comsol, discretization, scheme, solver, study

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
discretization schemes for Gradient rayan24 Fluent UDF and Scheme Programming 1 September 26, 2013 11:07
Grid Independence with discretization schemes saisanthoshm88 CFX 19 May 22, 2013 11:10
OpenCL linear solver for OpenFoam 1.7 (alpha) will come out very soon qinmaple OpenFOAM Announcements from Other Sources 4 August 10, 2012 12:00
Best solver for hydrulic valve cfd with Comsol? Mr Matti Karvonen COMSOL 0 July 3, 2008 06:56
Solver Selection with COMSOL S. Gatzka COMSOL 1 January 27, 2008 17:35


All times are GMT -4. The time now is 09:59.