[CFD] Rr Fender

[y-yosuke]

サイドポッドが高くなったのに伴いリアフェンダー前のデッキ？部分の 50mm 高いバージョン

[y-yosuke]

ジオメトリーデータのチェックが厳しくなって使えなくなったり，アップロードできなくなったりと全然進まない．

[y-yosuke]

Simulation Menu

• [x] Control
• [x] Control - Radiator Louver
• [x] Rr Fender 50mm Higher Deck
• [x] Rr Fender 50mm Higher Deck - Fairing Fin
• [x] Rr Fender 50mm Higher Deck - Fairing Box
• [x] Rr Fender 50mm Higher Deck - Radiator Louvre
• [ ] Rr Fender 50mm Higher Deck - Upper Fence
• [x] Rr Fender 50mm Higher Deck - Fairing Fin - Upper Fence

[y-yosuke]

（サイドディフューザー部分，今は板で終わらせているけど追加したらFr.ダウンフォースも増えるか...）

[y-yosuke]

（あまりなーフロアでダウンフォースを稼ぐと車高特性厳しくなって素人ドライブに適さなくなるような気がしてなぁ... でも「そんなもんダウンフォースを稼げてから言えや」的な考え方もありよなー）

[y-yosuke]

SimScale がアップロード時のオプション設定インタフェースを追加してくれたので，Rhino-Python でメッシュチェックしたり目視チェックしながら手動でジオメトリメッシュ修正をしたらアップロード＆利用できるようになった． https://www.simscale.com/workbench/?pid=6664511854195853653&mi=spec%3A4e9a86d0-693f-4a0c-9bfc-61b36dfdb4e6%2Cservice%3ASIMULATION%2Cstrategy%3A11831

[y-yosuke]

[y-yosuke]

さてと... 冬休みの宿題にしたいところ...

[y-yosuke]

• Rear Combi Lamps
  • https://www.gregsraceparts.com/products/grp-v3-tail-lights-for-01-elise-exige-02-04-esprit
  • https://www.youtube.com/watch?v=tkTx35Q5P9Y

[y-yosuke]

冬休みの宿題とか言ってたけど... Simulation Runs は終わっているがレポート書いてない． 春休みの宿題ぐらいで書き終えたいところ．

[y-yosuke]

Wiki は作った（だけ）． https://github.com/y-yosuke/formula-ppoino/wiki/%5Bfp024f%5D-Rear-Fender-Study

[y-yosuke]

[y-yosuke]

[y-yosuke]

[y-yosuke]

Re-captured images

[y-yosuke]

resized half

[y-yosuke]

gif images

[y-yosuke]

[y-yosuke]

[y-yosuke]

Fender and Radiator Outlet Types	Radiator Flow m^3/s
Control	0.1628
Rr Fender 50mm Higher Deck	0.1620
Rr Fender 50mm Higher Deck + Fin	0.1620
Rr Fender 50mm Higher Deck + Box	0.1626
Rr Fender 50mm Higher Deck + Fin + Upper Fence	0.1913
Control + Radiator Louvre	0.2447
Rr Fender - 50mm Higher Deck + Radiator Louvre	0.2358

[y-yosuke]

[y-yosuke]

• "Rr Fender 50mm Higher Deck + Fin" increases front and rear downforces best.
• Front and rear downforce increasements of "Rr Fender 50mm Higher Deck + Box" are around half compared to the "Fin" type.
• "Rr Fender 50mm Higher Deck + Box" has slight adavntage with drag decreasement compared to the "Fin" type
  • It may be possible to reduce drag by developing "Box" shape.
• "Rr Fender 50mm Higher Deck + Fin + Upper Fence" spoils the rear downforce improved by "Fin" shape, but it has the effect of increasing the radiator flow which will be described later.
• Radiator outlet louvres reduce downforce, but "Rr Fender 50mm Higher Deck + Radiator Louvre" reduces the reduction.

[y-yosuke]

• 4 cases: "Control", "Rr Fender 50mm Higher Deck", "Rr Fender 50mm Higher Deck + Fin" and "Rr Fender 50mm Higher Deck + Box" are almost the same.
• "Rr Fender 50mm Higher Deck + Fin + Upper Fence" has the highest radiator flow rate among the models without louvers, which is about 18% higher.
• "Rr Fender-50mm Higher Deck + Radiator Louvre" has about 3.6% less radiator flow rate than "Control + Radiator Louvre".
  • But as mentioned above, it has less adverse effect on downforce.

[y-yosuke]

[y-yosuke]

APNG

[y-yosuke]

• The radiator outlet louvres seem to reduce downforce by reducing the low pressure on the underside of the floor.

[y-yosuke]

[y-yosuke]

• Comparing the 2 models with radiator louvers, "50mm Higher Deck" seems to have a slightly stronger low pressure on the underside of the floor.

[y-yosuke]

Summary

• The "50mm Higher Deck" models generally tend to have better aerodynamic performance than the "Control" model.
• The "50mm Higher Deck" model reduces the drop in aerodynamic performance when a radiator outlet louver is installed.
• Among the "50mm Higher Deck" models,
  • "Fin" type increases downforce both front and rear best,
  • "Box" type has a potential for low drag shapes,
  • "Upper Fence" spoils the increase in "Fin" type rear downforce, but increases the radiator flow.

[y-yosuke]

うわ，この Issue 1年ものじゃないか...

[y-yosuke]

Introduction

Since there was room to raise the rear fender deck by 50 mm, I simulated some rear fender models of 50mm higher deck with some aerodynamic devices.

[y-yosuke]

• GitHub Wiki
  • https://github.com/y-yosuke/formula-ppoino/wiki/%5Bfp024f%5D-Rear-Fender-Study
• Post in SimScale Forum
  • https://www.simscale.com/forum/t/fp024f-rr-fender-study-simulation-project-by-yosukegb4/92683/2?u=yosukegb4

[y-yosuke]

• [x] SimScale Forum では GIF や APNG がちゃんと動作しない場合があるので何とかして直す．

[y-yosuke]

アニメーション画像 GitHub にアップロードしたファイルをリンク先としている場合は動いているけど SimScale Forum のシステムが外部サイトの画像は SimScale Forum 内の画像として置き換えるとアニメーション PNG が表示されなくなる？？？

[y-yosuke]

I replaced Animated-PNG files to Animated GIF files < 4MB.

[y-yosuke]

Mac では PicGIF Lite アプリが良いっぽい．

[y-yosuke]

（1年半ぶりぐらいにレポート投稿したんだけどフォーラムにいる人が替わっている...）