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Showing results 1 to 6 of 6 Search took 0.00 seconds. Search: Posts Made By: pbryant

Forum: OpenFOAM Running, Solving & CFD March 18, 2011, 11:56

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant Alberto, The block of water has a tendency... Alberto, The block of water has a tendency in these very high viscosity cases (nu>4) to rotate while moving, sometimes going sideways or even upwards and not necessarily in a straight line. ...

Forum: OpenFOAM Running, Solving & CFD March 16, 2011, 19:40

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant momentumPredictor eliminates gravity problem The "momentum predictor" step is normally turned off in interFoam. I'm not sure of the reasoning behind this, but I have found that turning it on leads to a very dramatic improvement in the dynamics...

Forum: OpenFOAM Running, Solving & CFD March 13, 2011, 12:22

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant Reducing all tolerances in fvSolution by 10x has... Reducing all tolerances in fvSolution by 10x has almost no effect. Here is a typical section of output from the log file: _____________________________________________________ Courant Number mean:...

Forum: OpenFOAM Running, Solving & CFD March 11, 2011, 20:54

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant Effective "g" value is scaled down For moderately high viscosity (up to nu=1.0 at least) the block of "water" does not behave erratically, but rather it moves in the downwards direction as expected from gravity. The only problem is...

Forum: OpenFOAM Running, Solving & CFD March 8, 2011, 04:03

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant A couple of comments: The severity of the... A couple of comments: The severity of the problem seems to be tied to the value of the "water" viscosity, rather than the viscosity ratio. I ran a variety of cases which indicate this. For...

Forum: OpenFOAM Running, Solving & CFD March 3, 2011, 18:15

Replies: 24 InterFoam viscosity problem / possible bug Views: 11,088 Posted By pbryant InterFoam viscosity problem / possible bug The InterFoam solver seems to be giving the wrong answer when the viscosity is large. To demonstrate this I generated a test case called waterDrop which I uploaded as a zip file. It is essentially...

Showing results 1 to 6 of 6

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