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Floating Point Exception - Oscilating Forces

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Old   February 18, 2013, 04:20
Default Floating Point Exception - Oscilating Forces
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Andreas Wendy
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Hi everybody,

i have two problems. Currently i am working on the simulation of an gyrocopter including autorotation but i got some strange problems:
when I calculate the forces/moments on my profile they are oscillating.

in the link below you find the complete cases for a static rotation and one for the autorotation added. when i run the auto rotation case my forces are increasing extremely and i have no idea why....

i am using pimpleDyMFoam and the GGI of OF 1.6 extend.

maybe some of you have ab idea.

best wishes

andy

static RPM: http://ubuntuone.com/7Eivib5v0AIGBE1pKjxk05
autorotation: http://ubuntuone.com/4Ay27nAKiikV7Uh7Gqem5c
Attached Files
File Type: txt controlDict.txt (2.1 KB, 3 views)
File Type: txt dynamicMeshDict.txt (1.6 KB, 4 views)
File Type: txt dynamicMeshDict_staticRPM.txt (1.2 KB, 3 views)
File Type: txt fvSchemes.txt (1.4 KB, 3 views)
File Type: txt fvSolution.txt (2.2 KB, 3 views)
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Old   February 19, 2013, 05:02
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Andreas Wendy
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hi everybody,

fault one mistake in my boundaries of the velocity and now it seemst to work better. but somehow i often get a floating point exception. when i write my data in a smaller timestep intervall and restart my computation from the latestTime the analysis is running more or less....

but this is a "dirty way" i think....
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Old   September 24, 2014, 10:30
Default Work with Autogyros
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Andrès Alirio Pinillos Rodriguez
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Hi Wendy,

Currently I'm starting an investigation about CFD with Autogyros rotors with NACA 8H12 airfoil and I'm starting with OpenFoam too, if you could provide me some advice about that fact, I appreciate. Thank you


Best Regards
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