Table II.
Details for Table 1: Time-averaged viscous dissipation rate, power loss, and analyses of assumptions 2,3, and 5
Model | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | AVG§ | SD§§ | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ėsim (mW)*1 | 0.56 | 1.87 | 2.68 | 3.88 | 3.69 | 5.97 | 4.16 | 3.56 | 0.87 | 11.7 | 3.89 | 3.19 | |
Ėsim ∩ U⃑n(mW)*2 | 0.52 | 1.67 | 2.53 | 3.28 | 3.05 | 4.65 | 3.24 | 2.84 | 0.71 | 10.9 | 3.34 | 2.93 | |
Ẇτ(μW)*3 | 1.47 | 3.34 | 2.11 | 1.67 | 1.33 | 5.95 | 4.07 | 3.04 | 2.08 | 3.7 | 2.88 | 1.45 | |
Ẇq(μW)*4 | −1.58 | 2.36 | −1.09 | 2.29 | 1.72 | 10.03 | 1.16 | 22.9 | 0.39 | 11.6 | 4.98 | 7.68 | |
Ėloss(mW)*5 | 0.52 | 1.67 | 2.53 | 3.28 | 3.05 | 4.65 | 3.24 | 2.82 | 0.71 | 10.9 | 3.33 | 2.92 | |
Φ(mW)*6 | 0.52 | 1.64 | 2.42 | 3.17 | 2.93 | 4.56 | 3.14 | 2.76 | 0.7 | 10.4 | 3.22 | 2.79 | |
| |||||||||||||
ΔĖsim ǂ1 | −7% | −12% | −6% | −18% | −21% | −28% | −28% | −26% | −22% | −8% | −17.7% | 9.0% | |
Δ(Ėsim ∩ U⃑n) ǂ2 | −8% | −12% | −6% | −19% | −21% | −28% | −28% | −25% | −23% | −8% | −17.7% | 8.8% | |
ΔẆτ ǂ3 | 0.3% | 0.2% | 0.1% | 0.1% | 0.0% | 0.1% | 0.1% | 0.1% | 0.3% | 0.0% | 0.1% | 0.1% | |
ΔẆq ǂ4 | −0.3% | 0.1% | 0.0% | 0.1% | 0.1% | 0.2% | 0.0% | 0.8% | 0.1% | 0.1% | 0.1% | 0.3% | |
ΔΦ ǂ5 | 0.6% | 1.9% | 4.5% | 3.3% | 3.9% | 1.8% | 3.2% | 2.1% | 1.6% | 4.5% | 2.7% | 1.3% | |
| |||||||||||||
§Avg = average value | §§SD = standard deviation | ||||||||||||
*1Ėsim | simplified power loss | ||||||||||||
*2Ėsim ∩ U⃑n | power loss with correctly calculated velocity profile (U⃑n) | ||||||||||||
*3Ẇτ = ∫CS τ⃑ · U⃑ dA | viscous work present on the control surface | ||||||||||||
*4
|
effect of time-derivatives of dynamic pressure and volume | ||||||||||||
*5Ėloss = (Ėsim ∩ U⃑n) + Ẇτ − Ẇq | true power loss | ||||||||||||
*6Φ | viscous dissipation rate | ||||||||||||
ǂ1ΔĖsim = (Ėloss − Ėsim)/Ėloss | discrepancy between simplified and true power losses | ||||||||||||
ǂ2Δ(Ėsim ∩ U⃑n) = 1 ∸ Ėsim/(Ėsim ∩ U⃑n) | time-averaged percentage discrepancy between power loss obtained using an accurate spatial velocity profile (assumption #5) and true power loss. | ||||||||||||
ǂ3 ΔẆτ = Ẇτ/Ėloss | time-averaged effect of viscous work on the control surface, assumption #2 | ||||||||||||
ǂ4 ΔẆq = Ẇq/Ėloss | time-averaged effect of control volume and dynamic pressure, assumption #3 | ||||||||||||
ǂ5ΔΦ = (Ėloss − Φ)/Ėloss | time-averaged discrepancy between viscous dissipation rate and true power loss |