|
[Sponsors] |
January 7, 2016, 09:24 |
Odd residuals plot using NITA
|
#1 |
New Member
Mark Schulte
Join Date: Dec 2015
Posts: 19
Rep Power: 10 |
Hello everyone, I am modeling a simple system of water flowing down a vertical surface. (I think it is funny what some people in some forums call a simple system...) I am tracking the wavy gas/liquid interface using VOF. Recently I start using Non-iterative Time Advancement (NITA) which solves faster than without, even with time steps that are small by an order of magnitude. However, it give odd residuals plots sometimes and I don't know if there is something wrong. The interface looks sharp, shaped as I expected, the solution progresses and most of the time it looks like:
NITA normal.png However, every once in a while I look at the residuals and they look like: NITA odd.png the solution doesn't crash and progresses as normal. Do I need to be worried? Is it just that Fluent is only storing a certain amount of residuals and clears it every once in a while? Any help is much appreciated. |
|
January 8, 2016, 01:02 |
|
#2 |
Senior Member
Join Date: Mar 2014
Posts: 375
Rep Power: 13 |
IF it is transient, that is what the residuals will look like.
|
|
Tags |
free surface, multiphase unsteady, nita, residuals, vof |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[Tutorials] Tutorial of how to plot residuals ! | wolle1982 | OpenFOAM Community Contributions | 171 | February 20, 2024 03:55 |
[swak4Foam] Foam warnings - related to swak4Foam | Salam-H | OpenFOAM Community Contributions | 20 | August 2, 2015 16:40 |
plot residuals | pigna | OpenFOAM Running, Solving & CFD | 2 | December 19, 2014 03:32 |
How to plot residuals of all iterations in Fluent | FJSJ | FLUENT | 4 | September 20, 2013 10:47 |
Residuals Plot | kamalipour | FLUENT | 2 | December 15, 2011 04:44 |