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

Memory requirement for lattice boltzmann methods (simple BGK)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 18, 2011, 12:14
Default Memory requirement for lattice boltzmann methods (simple BGK)
  #1
New Member
 
Join Date: Jan 2011
Posts: 1
Rep Power: 0
amaal is on a distinguished road
Hi every1,

I wondered if anyone can give an assumption on the memory requirement for a LBM - simulation with simple BGK dynamics.

So far I used only a 128x128x256 lattice, and my quad-core Desktop could run the simulations within 1-3 days.

Now we are increasing the lattice size, possible to even 1000x1000x1000 (or 750^3 is ok too).

The forumla Ive come up with looks like:

M = N^3 * 19 * 8 * x (in byte)

19 since im using D3Q19, 8 bytes for a double datatype (could scale down to 4 for float), and N^3 for the 3 dimensions.
The big question now is the x, which should basically be 3 if Im correct (2 velocity and 1 density matrix yes?). I do not use my own code, but use the package http://www.lbmethod.org/palabos/index.html
From the simulations Ive done so far, it seems <x> is around 1.5 for palabos, so maybe they store the data in a more efficient way. Also, for multiple cores the required memory increases, but with 4 cores on my desktop, this can be estimated too.

Im new to the subject, so if any1 has more experience a good estimate would help a lot, since it affects the new hardware we will buy.

thanks in advance
amaal 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
Lattice Boltzmann Methods for Shallow Water Flows phy4me Main CFD Forum 0 November 16, 2010 11:56
Velocity Under-relaxation in SIMPLE type methods Matt U. Main CFD Forum 6 July 4, 2005 05:29
boundary conditions for lattice Boltzmann methods Frederik Main CFD Forum 0 July 22, 2004 13:17
Memory requirement for unstructured solver Praveen Main CFD Forum 0 July 19, 2004 10:07
comments on FDM, FEM, FVM, SM, SEM, DSEM, BEM kenn Main CFD Forum 2 July 18, 2004 18:28


All times are GMT -4. The time now is 23:59.