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Old   January 19, 2012, 10:20
Default AMI turbine application
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RDG
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Hi all,
I was wondering if it is possible to define a case with AMI patches, like the one on the propeller tutorial, where the rotational velocity is calculated.
Much like a turbine, where the angular velocity depends on the velocity of the flow.

Thanks in advance.
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Old   March 21, 2012, 05:56
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Elia Daniele
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Hallo Onyir,
I have tried simply to use instead of the "rotatingMotion" contained in the tutorial (tutorials/incompressible/pimpleDyMFoam/propeller) under constant/dynamicMeshDict, the keyword "oscillatingRotatingMotion".

As indicated in the source files "oscillatingRotatingMotion.C" and "oscillatingRotatingMotion.H" one should use within dynamicMeshDict the following:

Quote:
oscillatingRotatingMotionCoeffs
{
CofG (0 0 0);
amplitude (0 10 0); // deg
omega 628; // rad/s
}
instead of the one provided within the tutorial:

Quote:
rotatingMotionCoeffs
{
CofG (0 0 0);
radialVelocity (0 9000 0); // deg/s
}
At least in this way the simulation for me starts without any problem up to a point when diverges on turbulent quantities. I will try with some different settings (e.g. maxCo) to see if I can overcome this problem.

Hope it helps,

Elia
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Old   March 21, 2012, 06:40
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Elia Daniele
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Hallo again,

I've tried with a simpler model also contained in the tutorials (tutorials/incompressible/pimpleDyMFoam/mixerVesselAMI2D), and with the little modifications to dynamicMeshDict it works fine.

I can not attach the folder from one can run the case, since it is a bit bigger than the forum upload file limit. If you need it send me an email.

Hope it helps,

Elia
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Old   March 21, 2012, 06:59
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Thank you for your interest fakekarma, but what I want to achieve is that the motion of the turbine is driven by the flux, more like the tutorial of moving wing, not by specified rotational speed.

Regards,

Ricardo.
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Old   March 21, 2012, 07:22
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Elia Daniele
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Hallo Onyir,
I can not understand if you need your body to react to the flow (like in a 6DOF simulation) or just have a variable speed based on some probes for velocity.

In the last case you could modify the source to accept an input for the omega instead of a fixed value.

Cheers,

Elia
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Old   March 21, 2012, 08:46
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Hello,
I need my body to react to the flow, like a 6DOF simulation.
Sorry if my description was not clear.
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Old   March 21, 2012, 08:59
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Elia Daniele
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Hallo Onyir,
as far as I now, the 6DOF capability is implemented in OF 1.6-ext, where user can set inertia, spring and damping parameters, that would be used in connection with the force and moments to etabilish the motion of the body. I've taken just a very rapid look to OF 2.1.0 and it seems to be no more present.

Good luck,

Elia
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