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IDProjectCategoryView StatusLast Update
0001421OpenFOAM[All Projects] Bugpublic2015-03-24 15:19
ReporterdhoraAssigned Tohenry 
PrioritynormalSeveritymajorReproducibilityalways
Status resolvedResolutionfixed 
Product Version 
Fixed in Version 
Summary0001421: Problem with Uf in pimpleDyMFoam
DescriptionThe usage of Uf in pimpleDyMFoam can lead to increased mass imbalances at cyclicAMI interfaces and pressure oscillations.
Steps To ReproduceSimulate the attached case and execute createPost. Check the evolution of the pressure at the INLET and the mass flow rates at the cyclicAMI interfaces. Do a second run with the attached pimpleDyMFoam solver.
TagsNo tags attached.

Activities

dhora

2014-10-24 00:01

reporter  

pump_dt1_pimple.tar.gz (1,613,566 bytes)

dhora

2014-10-24 00:03

reporter  

pimpleDyMFoam22.tar.gz (3,064 bytes)

dhora

2014-10-24 00:05

reporter  

mFlow.png (6,014 bytes)
mFlow.png (6,014 bytes)

dhora

2014-10-24 00:05

reporter  

mFlow_modSolver.png (9,983 bytes)
mFlow_modSolver.png (9,983 bytes)

dhora

2014-10-24 00:05

reporter  

pressure.png (7,500 bytes)
pressure.png (7,500 bytes)

dhora

2014-10-24 00:06

reporter  

pressure_modSolver.png (6,287 bytes)
pressure_modSolver.png (6,287 bytes)

henry

2015-03-23 08:09

manager   ~0004188

Could you clarify how much the mass-imbalance is increased by using Uf? From the graphs it appears that the mass-imbalance is more or less the same but with Uf there are also small oscillations or am I missing something?

dhora

2015-03-24 07:47

reporter   ~0004454

mFlow.png shows the solution of the 2.3.x solver with the new ddtCorr term. Inlet flow rate is 0.00376, outflow 0.00315. (15% difference).

mFlow_mod.png shows the solution of the modified solver without ddtCorr term (corresponding to solver from 2.2.x without ddtPhiCorr). The flow rates at inlet and outlet are almost identical.

henry

2015-03-24 07:49

manager   ~0004455

Thanks for the clarification, I will investigate.

henry

2015-03-24 11:36

manager   ~0004461

I have fixed the problem in OpenFOAM-dev and running some tests. I will push the fix to OpenFOAM-dev and OpenFOAM-2.3.x later today.

henry

2015-03-24 15:18

manager   ~0004465

Resolved by commit 719bf1b4e7dc29f6e5a8c7b1d2be39fff4de1c5a in OpenFOAM-2.3.x

Issue History

Date Modified Username Field Change
2014-10-24 00:01 dhora New Issue
2014-10-24 00:01 dhora File Added: pump_dt1_pimple.tar.gz
2014-10-24 00:03 dhora File Added: pimpleDyMFoam22.tar.gz
2014-10-24 00:05 dhora File Added: mFlow.png
2014-10-24 00:05 dhora File Added: mFlow_modSolver.png
2014-10-24 00:05 dhora File Added: pressure.png
2014-10-24 00:06 dhora File Added: pressure_modSolver.png
2015-03-23 08:09 henry Note Added: 0004188
2015-03-24 00:17 liuhuafei Issue cloned: 0001586
2015-03-24 07:47 dhora Note Added: 0004454
2015-03-24 07:49 henry Note Added: 0004455
2015-03-24 11:36 henry Note Added: 0004461
2015-03-24 15:18 henry Note Added: 0004465
2015-03-24 15:18 henry Status new => resolved
2015-03-24 15:18 henry Resolution open => fixed
2015-03-24 15:18 henry Assigned To => henry