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May 4, 2012, 09:59 |
Propeller disc theory in Star CCM+
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#1 |
New Member
Christian Rodriguez
Join Date: Jan 2012
Posts: 9
Rep Power: 14 |
Hey guys,
I am currently doing my master thesis in rotor aerodynamics for a small scaled helicopter. The first step before I include the main rotors in my mesh is to make a simplified verison of the model. My idea is to create a infinite thin disc over my helicopter body to simulate the flow of the rotor blade. The model will be simulated in a box which acts as a windtunnel (with a certain freestream velocity). Is there a easy way to model a disc in Star CCM+? I was wondering about this due to the fact that adding the disc will create a discontinuity in velocity and pressure around the rotor. Great forum btw //Christian |
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May 6, 2012, 09:02 |
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#2 |
Senior Member
Join Date: Oct 2009
Location: Germany
Posts: 636
Rep Power: 21 |
I'm not too sure about an infinite thin disk. Maybe it works with a fan interface, but I haven't tried that.
Another option would be to create a disk with a finite thickness. Create a region from that and put a momentum source. That should work for sure (we did something similar for wind park simulations to simplify the turbines).
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May 7, 2012, 08:24 |
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#3 |
Member
Ryan Coe
Join Date: Jun 2010
Location: Albuquerque, NM
Posts: 98
Rep Power: 15 |
I've used the finite thickness method described by abdul099 to model marine propellers. You can use a field function to set the strength of the momentum source based on some known propeller curve (ie advance ratio vs thrust and torque output).
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Ryan |
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December 13, 2014, 21:07 |
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#4 | |||
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
I am new to CCM+ and have some problems implementing an actuator disc to simulate a propellor/wind turbine. Need some help here please as i have spent very long hours but not getting anywhere.
I have seen many of the given tutorials and I thought the following tutorials are relevant to what I wanna achieve. Quote:
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My situation ahead Quote:
your guidance and help in part or whole is really really appreciated and would really make this whole work more enjoyable. thanks! Last edited by hwsv07; December 14, 2014 at 07:33. |
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December 14, 2014, 15:15 |
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#5 | ||
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
In my mind, to create an Actuator Disc simulation in a wind tunnel, the aim is to create 2 regions:
a) Rotating Region (representing the Disc) b) Fluid Region (representing the wind coming onto the Disc) Quote:
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Code:
Trimmer cannot currently accommodate multiple regions in one continuum. I really do not understand why. |
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December 15, 2014, 16:23 |
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#6 | |||
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
Ok so I made a bit of progress after much fiddling around over and over.
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Moving ahead, I have now specified a porous region for the disc. Under porosity option, there were a few options of inputing porosity: Constant, Field Function etc... I tried an extreme case of porosity 0 as a constant value. So I expected the flow to just pass through my disc as if it was non-existent. But this did not happen and there was absolutely no change in my thrust coefficient. How should I specify a specifc thrust for my disc? Thank you! |
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