|
[Sponsors] |
Setting small tolerances for very low slope conditions |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
February 14, 2013, 04:41 |
Setting small tolerances for very low slope conditions
|
#1 |
New Member
max
Join Date: Oct 2011
Posts: 10
Rep Power: 14 |
I am trying to study overland flows on low-sloped planes using Shallow Water physics of FLOW-3D. I tested FLOW-3D for an overland flow with 2% slope on concrete surface with rainfall source and it showed a very good match with the observed data. However when I test the same surface changing the slope to 0.005% and keeping all other parameter same, the simulation shows very high volume conservation error. Hence I suspect I have to change the detention or dry-wet or similar tolerance which differentiates the flow depth as dry or wet. I mean there should be some minimum error tolerance below which the flow depth is simply ignored. Or is there a minimum limiting value of slope set in FLOW-3D below which the slope calculated is simply ignored? I also did play with setting minimum and maximum time step to low values which also didn’t help. What is the correct tolerance that has to be changed? Any suggestion is highly appreciated.
Thank you |
|
Tags |
low slopes, overland flow, rainfall, shallow water equations, tolerances |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Low Speed Flow Boundary Conditions | Paul Bateman | FLUENT | 2 | January 10, 2013 13:01 |
Reading field values and setting them as boundary conditions | sega | OpenFOAM Running, Solving & CFD | 1 | July 7, 2009 06:18 |
help setting up boundary conditions for combustor | Tomas | CFX | 2 | November 3, 2005 03:34 |
Multicomponent fluid | Andrea | CFX | 2 | October 11, 2004 05:12 |
A problem about setting boundary conditions | lyang | Main CFD Forum | 0 | September 19, 1999 18:29 |