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Ship with Impeller BC choosing

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Old   June 15, 2015, 17:41
Default Ship with Impeller BC choosing
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Hey guys,
i make my Bachelors degree with this Openfoam case.

There is a boat with in impeller on the bottom side.
Because it would be too complicated and time consuming to simulate the instationary case with the rotating propeller, i consider the alternative to make a circle plane in the impeller cylinder and set a bc on this plane to accelerate the water and twist like a propeller would do.

At the moment i simulate with LTSInterFoam the Boat at a speed prox. 5 m/s without the thrust.

Now i want to implement the thrust, but i dont know how i can make a plane, that
1. lets the water pass through
2. accelerates it like a simplified propeller.

Hope you can help me.

Best regards

Daveman945
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Old   June 17, 2015, 16:32
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I forgot to add the sketch.



David
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Old   June 21, 2015, 07:27
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Hello,
i now found the actuationdisksource in the fvOption path.

But the Headerfile doesn´t say too much about the usage.

Is there a tutorial anywhere?

How can i use it with LTSInterFoam?

David
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Old   June 23, 2015, 11:50
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Hi Dave,

I am not sure this will be exactly what you are looking for but my guess is that it is pretty close :

You may want to look at the tutorial "TJunctionFan" ($FOAM_TUTORIALS/incompressible/pimpleFoam/TjunctionFan).
It includes a section of a tube where the BC is of type fan, derived from the cyclic BC that basicall connects two identical patch together.

Using this BC you can represent your thrust by encoding it into a pressure drop between the two sides of the patch, thus accelerating the fluid.

I hope this tutorial can help you achieve what you want.

Best,

Al_th
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Old   June 26, 2015, 17:25
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Okay,
i solved the problem with following settings:

I made a cellzone with cylinderAnnulusToCell.
in this cellzone a made the pressureGradientExplicitSource
then i added a MRFSource to the same Zone.
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boat, boundary, impeller, plane, propeller

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