I've been looking for a CFD application to be able to use my GA to do some wing design. So I was glad to find OpenFoam, but talking about a steep learning curve! And now I find that, you have already done lot of the work.. and even created Spinner to do the dynamic testing..
Would it be possible to acquire the Spinner software? Would love to be able to concentrate on the wind design (GA) and not having to start from scratch on the simulation.
There are two types of VAWTs, lift type and drag type. I think you are thinking of a drag type which moves slower, but has more torque. The lift type spins faster with less torque which is usually better for getting power out of alternators.
I am an aspiring OpenFOAMer, and this video is inspiring. What version are you using? Are you using either ggi or sliding interface? Do you have any validation data?
I'm running a laminar flow simulation and I should really be modeling turbulent flow. So my upwind drag isn't as high as it should be, making the power numbers kind of high. The general behavior of the turbine and relative powers to other turbines seems to be pretty good. I'm using OF1.5-dev with GGI.
No this video was about trying to figure out why VAWTs don't start. I do plan to do a bunch of standardized test, and those will have "Spinoff" in the title, and will be run at standard wind speeds
at 3:28 it shows 37 rpm for a tsr of 1.25 and then at 4:36 it shows a rpm of 38 for a tsr of .45 If the wind speed and the diameter is not changed; as you say this is a standardized test, then this is what I question
at 3:27 it shows 37 rpm for a tsr of 1.25 then at 4:35 it shows 38 rpm for a tsr of .45???? If the wind speed is the same for all of them and the dia is the same for LL OF THEM ???? THIS IS WHAT i QUESTION
Wind speed was not the same. Listen to what I say and read the text at 2:09, which is about the second run (5mph). Then read the text at 3:41 which is about the last run (15 mph). Same rpm, 3x the wind speed = 1/3rd the TSR.
why, if the dia. wind spd , and rpm is the same, is there a high tsr for one profile compared to another. I thought the variables: wind speed, rpm diameter were the factors to get tsr. The last two examples are 60"at 15 mph and the rpm is as close as you can get , yet one is over 1.25 and the other is less than .5?????
I've been looking for a CFD application to be able to use my GA to do some wing design. So I was glad to find OpenFoam, but talking about a steep learning curve! And now I find that, you have already done lot of the work.. and even created Spinner to do the dynamic testing..
Would it be possible to acquire the Spinner software? Would love to be able to concentrate on the wind design (GA) and not having to start from scratch on the simulation.
Thanks.
hmortensen2907 9 months ago
I like this, please design a kick ass simple to build DIY VAWT for all of us! Green energy forums techluck DOT com
nrodge1 1 year ago
@nrodge1 You should also check out vawts DOT net, I've posted lost of blade tests there under 'spinoff-results'
sjh7132 1 year ago
Well done simulation, but why are you using such poor blades and not quarter circle blades or something simular ?
overunitydotcom 1 year ago
@overunitydotcom
There are two types of VAWTs, lift type and drag type. I think you are thinking of a drag type which moves slower, but has more torque. The lift type spins faster with less torque which is usually better for getting power out of alternators.
sjh7132 1 year ago
Great vid, informative and interesting.
Have you thought of adding a fourth blade to your current design?
Guru1ofatl 1 year ago
@Guru1ofatl
No it turns out that 3 is a nice number from a mechanical support and resonance point of view.
sjh7132 1 year ago
Great vids, very interesting and informative.
Just curious, have you thought of adding a fourth blade to your current design?
Guru1ofatl 1 year ago
I am an aspiring OpenFOAMer, and this video is inspiring. What version are you using? Are you using either ggi or sliding interface? Do you have any validation data?
lordvon64 1 year ago
@lordvon64
I'm running a laminar flow simulation and I should really be modeling turbulent flow. So my upwind drag isn't as high as it should be, making the power numbers kind of high. The general behavior of the turbine and relative powers to other turbines seems to be pretty good. I'm using OF1.5-dev with GGI.
sjh7132 1 year ago
ok sorry, I thought you were doing standardized tests with the only variable being the blade.
itsandbits1 1 year ago
@itsandbits1
No this video was about trying to figure out why VAWTs don't start. I do plan to do a bunch of standardized test, and those will have "Spinoff" in the title, and will be run at standard wind speeds
sjh7132 1 year ago
at 3:28 it shows 37 rpm for a tsr of 1.25 and then at 4:36 it shows a rpm of 38 for a tsr of .45 If the wind speed and the diameter is not changed; as you say this is a standardized test, then this is what I question
itsandbits1 1 year ago
at 3:27 it shows 37 rpm for a tsr of 1.25 then at 4:35 it shows 38 rpm for a tsr of .45???? If the wind speed is the same for all of them and the dia is the same for LL OF THEM ???? THIS IS WHAT i QUESTION
itsandbits1 1 year ago
@itsandbits1
Wind speed was not the same. Listen to what I say and read the text at 2:09, which is about the second run (5mph). Then read the text at 3:41 which is about the last run (15 mph). Same rpm, 3x the wind speed = 1/3rd the TSR.
sjh7132 1 year ago
The last two had very close RPMs, but run #2 was 5 MPH wind and the last one was 15 MPH wind.
sjh7132 1 year ago
why, if the dia. wind spd , and rpm is the same, is there a high tsr for one profile compared to another. I thought the variables: wind speed, rpm diameter were the factors to get tsr. The last two examples are 60"at 15 mph and the rpm is as close as you can get , yet one is over 1.25 and the other is less than .5?????
itsandbits1 1 year ago
Nice video.
Aceman307 1 year ago
Great vid you obviously have a talent.
TK42138 1 year ago