Numerical Simulation of Self-Propelled Steady Jet Propulsion at Intermediate Reynolds Numbers: Effects of Orifice Size on Animal Jet Propulsion
Abstract
:1. Introduction
2. Numerical Simulation Method
2.1. Body Geometry
2.2. Computational Domain and Boundary Conditions
2.3. Numerical Solver Specifications
2.4. Performance Metrics
2.5. Grid Refinement Study
3. Results
3.1. Simulated Flow Fields
3.2. Drag Coefficients
3.3. Swimming Efficiencies, Jet Volume Flow Rate, and Jet-Propulsion Performance Index
4. Discussion
Supplementary Materials
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Symbol | Explanation |
---|---|
dorifice | Jet orifice diameter |
d | Body cross-sectional width |
L | Body length |
Ω | Orifice ratio (≡ dorifice/d) |
e | Body aspect ratio (≡ d/L) |
α | Funnel ratio [≡ (maximum cross-sectional area of funnel)/(total volume)2/3] |
U | Swimming speed |
Uj | Jet velocity relative to the jet orifice |
ν | Fluid kinematic viscosity |
ρ | Fluid density |
Re | Reynolds number (≡ U L/ν) |
x | Axial coordinate |
r | Radial coordinate |
Dviscous | Viscous drag |
Dpressure | Pressure drag |
D | Body drag (≡ Dviscous + Dpressure) |
Dtow | Drag acting on the towed non-jetting body |
T | Total jet thrust |
Acs | Body cross-sectional area (≡ π d2/4) |
Ajet | Jet area (≡ π dorifice2/4) |
CD-viscous | Viscous drag coefficient |
CD-pressure | Pressure drag coefficient |
CD | Drag coefficient (≡ CD-viscous + CD-pressure) |
Pjet | Jet power |
Puseful | Useful power (≡ D U) |
Ptow | Tow power (≡ Dtow U) |
ηFPE | Froude propulsion efficiency (≡ Puseful/Pjet) |
ηQPE | Quasi-propulsive efficiency (≡ Ptow/Pjet) |
Q | Jet volume flow rate |
Iperformance | Jet-propulsion performance index (≡ Acs U/Q) |
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Jiang, H. Numerical Simulation of Self-Propelled Steady Jet Propulsion at Intermediate Reynolds Numbers: Effects of Orifice Size on Animal Jet Propulsion. Fluids 2021, 6, 230. https://doi.org/10.3390/fluids6060230
Jiang H. Numerical Simulation of Self-Propelled Steady Jet Propulsion at Intermediate Reynolds Numbers: Effects of Orifice Size on Animal Jet Propulsion. Fluids. 2021; 6(6):230. https://doi.org/10.3390/fluids6060230
Chicago/Turabian StyleJiang, Houshuo. 2021. "Numerical Simulation of Self-Propelled Steady Jet Propulsion at Intermediate Reynolds Numbers: Effects of Orifice Size on Animal Jet Propulsion" Fluids 6, no. 6: 230. https://doi.org/10.3390/fluids6060230