|
[Sponsors] |
June 21, 2010, 20:56 |
Time step
|
#1 |
New Member
Aaron
Join Date: May 2010
Posts: 4
Rep Power: 15 |
Hi all--
I am modeling a stiff reaction network in laminar flow in a microchannel. The channel is not straight and has several mixing regions. I am using fluent and an implicit segregated solver. The nominal fluid residence time in the channel is 1-10 seconds, however some of the reaction rates are on the scale of 1e-6 sec. I am monitoring the concentration of certain species, and as soon as they asymptote out I think I am done, but if I change the timestep to be lower or higher the species composition changes. Should I keep going lower and lower until it does not change? If I try and solve it on the time scale of the chemistry I will be here forever. Thanks, Aaron |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
HELP! time step too small? | meangreen | Main CFD Forum | 6 | May 31, 2018 10:41 |
Superlinear speedup in OpenFOAM 13 | msrinath80 | OpenFOAM Running, Solving & CFD | 18 | March 3, 2015 05:36 |
Hydrostatic Pressure and Gravity | miliante | OpenFOAM Running, Solving & CFD | 132 | October 7, 2012 22:50 |
calculation diverge after continue to run | zhajingjing | OpenFOAM | 0 | April 28, 2010 04:35 |
Overflow problem in steady simulation | ReeKo | CFX | 11 | October 8, 2008 17:57 |