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[fp024a] Sidepod Radiator Study

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Yosuke Yamamoto edited this page Mar 27, 2018 · 128 revisions

fp024a - Sidepod / Radiator Study

This study is based on simulations as below.

Contents

  • Simulations
    • Model with Updates
    • Radiator Models
    • Sidepod C / Radiator Duct C
    • Sidepod Radiator Outlet Louvers
    • Radiator Duct D
    • Radiator Duct Turning Vanes
  • Summary

Simulations

Model with Updates

I rebuilt a CFD model with mechanical design updates. The bodyworks are basically the same with the former model in fp-023d simulation. Major changes are as follows.

  • Opening holes for suspension arms on the rear bodywork
  • Opening one upper hole on the rear bodywork end
  • Applying designs of mechanical parts inside the bodywork
  • Modifying suspension geometries and arm designs

fp024a_cfd_model-with-updates_pressure_rear-view

Coefficients of Forces on Body and Wheels

Coef. Control Model with Updates Difference Difference % Remarks
Cm 0.0518 0.0352 -0.0166 -32.1
Cd 0.5649 0.5637 -0.0013 -0.2
Cl -0.2135 -0.1795 0.0340 -15.9
Clf -0.0550 -0.0546 0.0004 -0.7
Clr -0.1586 -0.1249 0.0336 -21.2
CoP 0.7425 0.6959 -0.0466 -4.7
L/D -0.3780 -0.3185 0.0595 -15.7

Coefficients of Forces on Body Only (without Wheels)

Coef. Control Model with Updates Difference Difference % Remarks
Cm 0.0282 0.0099 -0.0184 -65.1
Cd 0.4531 0.4545 0.0014 0.3
Cl -0.2557 -0.2176 0.0381 -14.9
Clf -0.0996 -0.0989 0.0007 -0.7
Clr -0.1561 -0.1186 0.0374 -24.0
CoP 0.6104 0.5453 -0.0651 -6.5
L/D -0.5643 -0.4786 0.0856 -15.2
  • Control : Re-calc. fp024d / Side Mirror - 30mm Higher & 20mm Outer

The drags and the front downforces are almost the same, but the rear downforce decreased significantly at the model with updates.

I searched for the causes and found some low pressure areas are decreasing on the bottom side of the stepped floor and the rear bumper.

fp024a_cfd_model-with-updates_pressure_bottom-view

Although the rear downforce is decreasing, since it is a model which the car designs are more applied to, simulations will be based on this model afterwards.

Radiator Models

  • Radiator Model : 20mm x 20mm Square Holes
    • 14 x 9 = 126 Holes / 30mm Pitch / Depth 35mm
    • Duct Area = 120523.294 (+/- 0.00023) mm2
    • Not Hole Area = 70123.2943 (+/- 0.00023) mm2
    • Opening 41.8% : (120523.294-70123.2943)/120523.294 = 0.41817642073
  • Radiator Model : 10mm x 10mm Square Holes
    • 28 x 18 = 504 Holes / 15mm Pitch / Depth 35mm
    • Duct Area = 120523.294 (+/- 0.00023) mm2
    • Not Hole Area = 70123.2943 (+/- 0.00023) mm2
    • Opening 41.8% : (120523.294-70123.2943)/120523.294 = 0.41817642073

Radiator Model - None : Control fp024a_cfd_radiatormodel-none

Radiator Model - 20mm x 20mm Holes fp024a_cfd_radiatormodel-20mmx20mm

Radiator Model - 10mm x 10mm Holes fp024a_cfd_radiatormodel-10mmx10mm

Coef. Control Diff 20mm x 20mm Diff 10mm x 10mm Remarks
Cm 0.0352 0.0001 0.0353 0.0003 0.0356
Cd 0.5637 0.0001 0.5637 0.0000 0.5638
Cl -0.1795 -0.0014 -0.1810 0.0004 -0.1806
Clf -0.0546 -0.0006 -0.0552 0.0005 -0.0547
Clr -0.1249 -0.0008 -0.1258 -0.0002 -0.1259
CoP 0.6959 -0.0009 0.6950 0.0022 0.6973
L/D -0.3185 -0.0025 -0.3210 0.0007 -0.3203
RF 0.2057 -0.0298 0.1760 -0.0403 0.1357 Radiatro Flow m3/s
RF 1.0000 -0.1447 0.8553 -0.1957 0.6596 RF / Control
Coef. Control Diff 20mm x 20mm Diff 10mm x 10mm Remarks
Cm 0.0099 0.0002 0.0101 0.0003 0.0104
Cd 0.4545 0.0002 0.4548 0.0000 0.4548
Cl -0.2176 -0.0014 -0.2190 0.0002 -0.2188
Clf -0.0989 -0.0005 -0.0994 0.0004 -0.0990
Clr -0.1186 -0.0009 -0.1196 -0.0002 -0.1198
CoP 0.5453 0.0008 0.5461 0.0016 0.5476
L/D -0.4786 -0.0029 -0.4815 0.0005 -0.4811

Sidepod B - No Radiator fp024a_cfd_radiator_u-mag_sidepod-b_no-radiator

Sidepod B - Radiator 20mm x 20mm Holes fp024a_cfd_radiator_u-mag_sidepod-b_radiator-20mmx20mm-holes

Sidepod B - Radiator 10mm x 10mm Holes fp024a_cfd_radiator_u-mag_sidepod-b_radiator-10mmx10mm-holes

Sidepod C / Radiator Duct C

Sidepod C & Radiator Duct C Difference GIF Images

fp024a_cfd_sidepod-c-diff

fp024a_cfd_radiator-c-diff

Coefficients of Forces on Body and Wheels

Coef. Control Sidepod C Difference Difference % Remarks
Cm 0.0356 0.0334 -0.0022 -6.2
Cd 0.5638 0.5632 -0.0006 -0.1
Cl -0.1806 -0.1770 0.0036 -2.0
Clf -0.0547 -0.0551 -0.0004 0.8
Clr -0.1259 -0.1219 0.0040 -3.2
CoP 0.6973 0.6888 -0.0085 -0.8
L/D -0.3203 -0.3143 0.0060 -1.9
RF 0.1357 0.1551 0.0194 14.3 Radiator Flow m^3/s

Coefficients of Forces on Body Only (without Wheels)

Coef. Control Sidepod C Difference Difference % Remarks
Cm 0.0104 0.0080 -0.0024 -22.8
Cd 0.4548 0.4537 -0.0011 -0.2
Cl -0.2188 -0.2151 0.0036 -1.7
Clf -0.0990 -0.0995 -0.0006 0.6
Clr -0.1198 -0.1156 0.0042 -3.5
CoP 0.5476 0.5374 -0.0103 -1.0
L/D -0.4811 -0.4742 0.0069 -1.4
  • Control : Radiator Holes 10mm x 10mm

Sidepod Radiator Outlet Louvers

Sidepod C - Louvers fp024a_cfd_sidepod-c_louvers

Sidepod C - Louver Lower fp024a_cfd_sidepod-c_louver_lwr

Sidepod C - Louver Lower / Top Half fp024a_cfd_sidepod-c_louver_lwr_top-half

Sidepod C - Louver Lower Backward fp024a_cfd_sidepod-c_louver_lwr_bwd

Sidepod C - Louver Lower Backward / Top Half fp024a_cfd_sidepod-c_louver_lwr_bwd_top-half

Sidepod C - Louver Upper fp024a_cfd_sidepod-c_louver_upr

Coefficients of Forces on Body and Wheels

Coef. Sidepod C Louver Lwr Louver Lwr / Top Half Louver Lwr Bwd Louver Lwr Bwd / Top Half Louver Upr Remarks
Cm 0.0334 0.0322 0.0329 0.0312 0.0321 0.0311
Cd 0.5632 0.5636 0.5631 0.5628 0.5628 0.5637
Cl -0.1770 -0.1702 -0.1745 -0.1673 -0.1727 -0.1696
Clf -0.0551 -0.0529 -0.0544 -0.0524 -0.0542 -0.0537
Clr -0.1219 -0.1173 -0.1201 -0.1149 -0.1185 -0.1159
CoP 0.6888 0.6891 0.6883 0.6867 0.6860 0.6835
L/D -0.3143 -0.3019 -0.3098 -0.2972 -0.3069 -0.3008
RF 0.1551 0.2319 0.1939 0.2056 0.1857 0.2133 Radiator Flow m3/s
RF 1.0000 1.4955 1.2505 1.3259 1.1979 1.3756 RF / Control

Coefficients of Forces on Body Only (without Wheels)

Coef. Sidepod C Louver Lwr Louver Lwr / Top Half Louver Lwr Bwd Louver Lwr Bwd / Top Half Louver Upr Remarks
Cm 0.0080 0.0069 0.0075 0.0060 0.0069 0.0059
Cd 0.4537 0.4557 0.4542 0.4550 0.4541 0.4555
Cl -0.2151 -0.2083 -0.2126 -0.2053 -0.2109 -0.2077
Clf -0.0995 -0.0973 -0.0988 -0.0967 -0.0986 -0.0980
Clr -0.1156 -0.1110 -0.1138 -0.1086 -0.1123 -0.1097
CoP 0.5374 0.5330 0.5354 0.5291 0.5326 0.5282
L/D -0.4742 -0.4570 -0.4681 -0.4512 -0.4644 -0.4559

Radiator Duct D

Radiator Duct Turning Vanes

Summary

Radiator Flow - U Magnitude

Sidepod C fp024a_cfd_radiator_u-mag_sidepod-c

Sidepod C - Louver Lwr fp024a_cfd_radiator_u-mag_sidepod-c_louver-lwr

Sidepod C - Louver Lwr / Top Half fp024a_cfd_radiator_u-mag_sidepod-c_louver-lwr_top-half

Sidepod C - Louver Lwr Bwd fp024a_cfd_radiator_u-mag_sidepod-c_louver-lwr_bwd

Sidepod C - Louver Lwr Bwd / Top Half fp024a_cfd_radiator_u-mag_sidepod-c_louver-lwr_bwd_top-half

Sidepod C - Louver Upr fp024a_cfd_radiator_u-mag_sidepod-c_louver-upr

Sidepod C - Radiator Duct D fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d

Sidepod C - Radiator Duct D / Turning Fillet fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d_turning-fillet

Sidepod C - Radiator Duct D / Turning Vane - V fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d_turning-vane-v

Sidepod C - Radiator Duct D / Turning Vane - V 2pcs fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d_turning-vane-v-2pcs

Sidepod C - Radiator Duct D / Turning Vane - H fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d_turning-vane-h

Sidepod C - Radiator Duct D / Turning Vane - H-B fp024a_cfd_radiator_u-mag_sidepod-c_radiator-duct-d_turning-vane-h-b

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