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Creating a rotating plane for a fan without modelling the blades

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Old   October 23, 2018, 00:17
Default Creating a rotating plane for a fan without modelling the blades
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Kevin Williams
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Hi all,

I am trying to run a flow simulation in a duct with a fan placed in the middle without modelling the fan blades.
I have the rotational speed of the fan and the inlet velocity and was thinking if its possible to create some sort of rotating plane where the fan is positioned to simulate swirl from that region.

Can someone guide me on how I should proceed?

Thanks.
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Old   November 6, 2018, 06:33
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Hi all,

Any responses would be appreciated?

Thanks
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Old   November 7, 2018, 12:40
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Quote:
Originally Posted by firestone9x View Post
Hi all,

I am trying to run a flow simulation in a duct with a fan placed in the middle without modelling the fan blades.
I have the rotational speed of the fan and the inlet velocity and was thinking if its possible to create some sort of rotating plane where the fan is positioned to simulate swirl from that region.

Can someone guide me on how I should proceed?

Thanks.
You could create a baffle in your geometry, and use a cyclic pressure jump condition (see tjunctionfan tutorial if you are not familiar with baffles and cyclic boundary conditions). If you need the swirl you could look into something like the "swirlfanvelocity" as included in v1806:

https://www.openfoam.com/releases/op...conditions.php
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Old   November 7, 2018, 15:43
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Could also look at this tutorial.


I made the initial case to test the workings of the rotorDisk.


https://github.com/OpenFOAM/OpenFOAM...Foam/rotorDisk


https://www.openfoam.com/documentati...otor-disk.html


Another way to add swirl is to use porous media. So combine the fan bc with porous media.


http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf page 10



https://www.openfoam.com/documentati...-jump-fan.html
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Old   November 8, 2018, 04:27
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Try reading up on the actuator disk model if you want realistic simulation of the fan. It makes use of lift and drag data for the fan profile to determine the flow field that would result of the fan. It has been successfully used in applications such as modeling entire air cooled condenser systems for power plants
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Old   November 12, 2018, 01:02
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Thanks for all your responses.

I am going to try out your suggestions and keep you'll posted.
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