Fp-023d - Rear Bodywork Study


#1

I created a new simulation project called 'fp-023d - Rear Bodywork'

CFD Simulations of fp-023d Rear Bodywork


More of my public projects can be found here.


Fp-023c - Front Aero Device Study
Maximizing ratio Cl/Cd
'fp024c - Side Mirrors' simulation project by yosukegb4
#2

fp-023d - Rear Bodywork Study

This study is based on Fp-023c - Front Aero Device Study .



Contents

  • Simulations
    • Diffuser
      • Diffuser End 20mm Higher
      • Diffuser Vertical Fin
    • Rr Bumper B
    • Rr Bonnet Horizontal Vane
    • Side Mirror
      • Side Mirrorless
      • Side Mirror - 30mm Higher and 20mm Outer
    • Rr Wing
      • Rr Wing - 1 Piece 50mm Higher
      • Rr Wing - 1 Piece and 2 Pieces
      • Rr Wing Flap Angle
      • Rr Wing 2 Pieces and Lower Front Ride Height
  • Summary

#3

Diffuser

Diffuser End 20mm Higher

Diffuser End 20mm Higher (N=1200) / Control : Rr Fender for Tire Stroke (N=1200)

Body and Wheels

Body Only


  • Diffuser End 20mm Higher
    • Front and rear downforces increase without increase of drag
      • Improvement of L/D

#4

Diffuser End 20mm Higher - Pressure Comparison

Pressure Underbody

Pressure Underbody - Zoom to Floor

Pressure Underbody - Diffuser Bottom View


#5

Diffuser End 20mm Higher - Flow around the floor Comparison

Rear View

Left View - GIF Animation


#6

Diffuser Vertical Fin

Diffuser Vertical Fin / Control : Diffuser End 20mm Higher (Diffuser Vertical Fin - None)

Body and Wheels

Body Only


‘Diffuser Vertical Fin - None’ is the best. These vertical fins decrease the downforces.


#7

Diffuser Vertical Fin - None / Flow and Pressure Comparison

Bottom View

  • It seems the fin is interfering with the flow a little.

Rear View

Side View - GIF Animaiton

Pressure - Bottom View


#8

Rr Bumper B


Rr Bumper B / Control : Diffuser End 20mm Higher (N=1200)

Body and Wheels

Body Only


  • ‘Rr Bumper B’ slightly increases front downforce and decreases rear downforce.
  • These changes of downforces are small and not deterministic.
  • The drag is almost the same.

#9

Rr Bumper B - U Magnitude Comparison

Section Y=-450 - GIF Animation


#10

Rr Bonnet Horizontal Vane


Rr Bonnet Horizontal Vane / Control : Rr Bumper B

Body and Wheels

Body Only


  • ‘Rr Bonnet Horizontal Vane’ slightly increases front downforce and decreases rear downforce.
  • These changes of downforces are small and not deterministic.
  • The drag is almost the same.

#11

Rr Bonnet Horizontal Vane - Flow and Pressure Comparison

Flow GIF Animation - Center Sectional View

Pressure Comparison - Top View


#12

Side Mirror

Side Mirrorless

Side Mirrorless / Control : Rr Bonnet Horizontal Vane

Body and Wheels

Body Only


  • ‘Side Mirror’ decreases the front downforce or increases the front lift force.
  • The drags and the rear downforce are similar between ‘Side Mirrorless’ and ‘Original Side Mirror’.

'fp024c - Side Mirrors' simulation project by yosukegb4
#13

Side Mirrorless - Flow and Pressure Comparison

Flow Comparison - GIF Animaiton

  • It seems that the side mirror is bending the flow downward and generating lift force.

Pressure Comparison


#14

Side Mirror - 30mm Higher and 20mm Outer

Change of the side mirror position for higer rear wings


Side Mirror - 30mm Higher and 20mm Outer
/ Control : Rr Bonnet Horizontal Vane (Side Mirror Origin)

Body and Wheels

Body Only


  • ‘Side Mirror - 30mm Higher and 20mm Outer’ decreases the front and rear downforce. But the differnces are not enough large for difinite.
  • The drags are almost the same.

#15

Side Mirror 30mm Higher 20mm Outer - Flow and Pressure Comparison

Flow Comparison - Side View / GIF Animation

Pressure Comparison - Top View


#16

Rr Wing

Rr Wing - 1 Piece 50mm Higher

Rr Wing 1pc 50mm Higher / Control : Side Mirror - 30mm Higher & 20mm Outer

Body and Wheels

Body Only


  • ‘50mm Higher Rr Wing’ increases the rear downforce and decreases the front downforce.
  • ‘50mm Higher Rr Wing’ increases the drag slightly.

#17

Rr Wing - 1 Piece 50mm Higher - Flow and Pressure Comparison

Center Flow Comparison / GIF Animation
Line Pitch : 20mm

Line Pitch : 10mm

Pressure Comparison - Top View

Pressure Comparison - Bottom View

Pressure Comparison - Rear View


#18

Rr Wing - 1 Piece and 2 Pieces

  • 2 pcs Control : Rr Wing Main 1.4 Flap 1.3 32.7deg
  • 2 pcs -5 deg : Rr Wing -5deg / Main 1.4 Flap 1.3
  • 2 pcs -10 deg : Rr Wing -10deg / Main 1.4 Flap 1.3
  • 1 pc Z+50mm : Rr Wing 1pc 50mm Higher

Body and Wheels

Body Only


#19

Rr Wing - 1 Piece and 2 Pieces / Flow Comparizon - Wing and Diffuser

Flow Comparison - GIF Animation

Each Still Images


#20

Rr Wing - 1 Piece and 2 Pieces / Flow Comparizon - Wing

Flow Comparison - GIF Animation

Each Still Images