|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Manideep Reddy
Join Date: Aug 2017
Posts: 7
Rep Power: 9 ![]() |
Dear Foamers,
I am trying to simulate external flow over a geometry of an airship using simpleFoam solver and found that the residuals are not dropping at all after few iterations. So, I stopped the solver to see the pressure field. I found that the flow is not symmetric and pressure drag is more than five time that expected. Can anyone please explain why is this happening..? Is this because I am using steady state solver for flows with unsteady phenomenon involved or other reason. Thanks in advance. ![]() ![]() TThanks in advance. |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Uwe Pilz
Join Date: Feb 2017
Location: Leipzig, Germany
Posts: 744
Rep Power: 15 ![]() |
Depending on your Re number you may get an oscillatory solution. I recommend to use a transient solver like pimple- or pisoFoam. You see more directly where the problems of your models are.
__________________
Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950) |
|
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
SimpleFoam: High residuals after increase in Reynolds Number | JasonG | OpenFOAM Running, Solving & CFD | 21 | October 5, 2017 10:11 |
Buoyantboussinesq simpleFoam residuals problem | Naresh yathuru | OpenFOAM Running, Solving & CFD | 6 | March 20, 2015 14:33 |
simpleFoam parallel solver & Fluent polyhedral mesh | Zlatko | OpenFOAM Running, Solving & CFD | 3 | September 26, 2014 06:53 |
motorBike Residuals for SST k-omega... and mine | JR22 | OpenFOAM Running, Solving & CFD | 6 | August 1, 2013 09:08 |
SimpleFoam - Interpretation of Residuals | despaired student | OpenFOAM Running, Solving & CFD | 3 | February 8, 2013 07:39 |