How effective is the submarine harness? paragliding CFD simulation パラグライダー流体解析

Рет қаралды 34,210

2 жыл бұрын

先日の世界選手権で１位２位３位を独占したオゾンのサブマリンハーネス。圧倒的な滑空性能を見せつけられましたが、果たしてハーネスが良いのか、グライダーが良いのか、腕が良いのか？
どうしても気になったので流体シミュレーションを行ってみました。
今までの競技用ハーネスよりも滑空比で0.5以上向上する解析結果となりました。
今までシミュレーション結果の絶対値は全く信用していませんでしたが、L/D11.55とか、かなりそれっぽい数値が出てきて面白いです。
OpenFoam使用。
非定常解析
乱流モデルは、LES(WALEモデル)を使用。

Пікірлер: 21

@FlyWithGreg 2 жыл бұрын

This is great Hiro! Please run another simulation investigating: a standard pod that fills in the area behind the helmet (Lightness 3), the effect of gliding with your hands held low down on the risers, and the effect of a badly-set pod with -30degrees and +30degrees of tilt.

@hiro-wi2nm 2 жыл бұрын

I am also interested in the proposal. And gopro on the helmet too.

@TimPentreath 2 жыл бұрын

@@hiro-wi2nm Great work, thanks. Please add the effect of windscreens too - eg. Lightness 3. I believe they make a significant difference...

@Ripstop_pilot 2 жыл бұрын

Love these ideas. BUT...how much more can we get if the pilots head in the submarine is in a canopy or aero helmet or screen? And aero fairings on arms?

@MIMparamodels Күн бұрын

very interesting analysis !!!! how did you generate the wing stl ? it almost looks like some sort of 3D scanned wing

@flybubblecarlo 2 жыл бұрын

Thanks for sharing your findings Hiro 🙏 - interesting results, with seemingly clear conclusions! 🤓

@flybubblecarlo 2 жыл бұрын

ps. If you're able to run simulations to test how much stability affects performance i.e. comparing a harness of the same basic type/shape which remains closer to the most efficient angle to one that deviates more from the optimum, that would also be interesting. I suppose the results might vary quite a bit from one basic type/shape harness to the other e.g. the standard open harness would be less badly affected by instability than the most streamlined harness, relatively speaking.

@WalterNeser 2 жыл бұрын

This is very interesting! It however looks like the airflow is horizontal, rather than at the L/D of the glider - this could make a significant difference... It's an important point when setting up your pod, so that the angle is aligned with the expected airflow.

@hiro-wi2nm 2 жыл бұрын

The airflow is horizontal, but instead the harness is pitched up 6 degrees. atan(1/10)≒6deg I would like to verify other angles as well.

@booketoiles1600 2 жыл бұрын

thank you, that's awesome data

@AndreBandarra1 2 жыл бұрын

Very cool simulation and results. Thanks for sharing!

@user-ic8od8lf3k 2 жыл бұрын

素晴らしいです。Hiroさんの労力に感謝します！コンペハーネスメーカーはこぞってSubmarineタイプのハーネス開発・販売をするのでしょうね。

@hiro-wi2nm 2 жыл бұрын

市販されたら是非とも手に入れたいですね。噂によると、体型に合わせて採寸しながらオーダーメイドで作っているそうです。飛びながらの計器類の操作にも難があるので、市販までにはもう少し時間が掛かるのかなと思っています。姿勢も凄く寝ている様に見えますし、サーマル内でもヨーやピッチの動きが大きく出ていたので、乗り心地も気になるところです。

@Beniflyy Жыл бұрын

If the suspension points are as far forward as in the simulation, the harness would have a massive angle of attack and probably more drag than a seat harness.

@Itsallgoodtogo 2 жыл бұрын

Hiro is a legend!

@hiro-wi2nm 2 жыл бұрын

Lol. Thank you!

@telkmx Жыл бұрын

@@hiro-wi2nm any plan of doing more ? What is the software you use to run the sim ? edit: looks like autodesk cfd or ?

@telkmx Жыл бұрын

Would you mind sharing the models so i dont have to redo them ?

@AvengerIl 2 жыл бұрын

So how about enB Vs enBh vs enC vs enD vs enCCC, any numbers for those?

@Ripstop_pilot 2 жыл бұрын

Another thing I'd love to see is the different manufacture wing characteristics. On one wing model can you simulate... Advance's winglets? Sky walks jet flaps? Air design vortex wingtip holes? And measure drag reduction or increase in these small details? Amazing work by the way.