|
[Sponsors] |
LRR Rstm pipe flow takes too long to get fully developed |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
February 13, 2010, 12:26 |
LRR Rstm pipe flow takes too long to get fully developed
|
#1 |
Senior Member
Join Date: Mar 2009
Location: Norway
Posts: 138
Rep Power: 17 |
Dear foamers,
I'm setting up a pipe flow and comparing this to Eggels data for pipe flow at Re = 5500. k-omega-SST yields "almost" satisfying results, and now I'm trying with LRR Rstm turbulence model instead. So far the plots for 'k' seems ok, but a thing that worries me is that it takes so long for the flow to get fully developed. I include here a screenshot with a number of different plots, showing how axial velocity varies along the entire pipe length, and far beyond the "5 X diameter" rule. Also included is the residuals plot. I feel it's clearly something fishy going on here, as the pressure and U_y and U_z never drops below 0.001, even though they they are set in fvSolutions (both tolerance and relTol) to limits far below. Suggestions on to how to improve this? |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
BC for fully developed turbulent flow in a pipe | mmd014 | FLUENT | 2 | May 22, 2009 07:50 |
2D representation of pipe for fully developed flow | Nathan | FLUENT | 3 | November 22, 2008 11:01 |
Simulating fully developed flow in a pipe | Tim Donohue | CFX | 1 | November 20, 2007 21:24 |
developed pipe flow | Gerd | FLUENT | 0 | October 13, 2005 13:11 |
Hydrostatic pressure in 2-phase flow modeling (long) | DS & HB | Main CFD Forum | 0 | January 8, 2000 16:00 |