CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Integration time step for coupled ODEs

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 4, 2011, 03:17
Default Integration time step for coupled ODEs
New Member
Alberto Cuoci
Join Date: Aug 2009
Posts: 3
Rep Power: 16
alberto_cuoci is on a distinguished road
Hello everybody,

I am using the implicit Euler method to solve a coupled system of ODEs (temperature + chemical species) with convection, diffusion and (stiff) reactions. The number of species is about 30 and the number of points is about 100,000, which means that the total number of equations is quite large (3,000,000). I am using MUMPS to solve the corresponding linear systems.

I am looking to a smart methodology to choose and modify the integration time step size during the calculations, in order to minimize the total number of steps to reach the final solution (which corresponds to the steady state conditions). In the current version of my code I increase the time step with a fixed ratio, but I think this approach is not so efficient. I was wondering if a better technique is available.

Thanks a lot.

alberto_cuoci is offline   Reply With Quote


ode, reaction, steady state, time step size

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
TimeVaryingMappedFixedValue irishdave OpenFOAM Running, Solving & CFD 32 June 16, 2021 06:55
SLTS+rhoPisoFoam: what is rDeltaT??? nileshjrane OpenFOAM Running, Solving & CFD 4 February 25, 2013 04:13
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 14:09
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58
unsteady calcs in FLUENT Sanjay Padhiar Main CFD Forum 1 March 31, 1999 12:32

All times are GMT -4. The time now is 21:26.