A first attempt to numerically compute forces on birds in V formation

Area of Science:

• Fluid dynamics
• Aerodynamics
• Bio-inspired engineering

Background:

• Understanding fluid forces on bodies in formation is crucial for efficiency.
• Flocking behavior in birds suggests aerodynamic advantages.
• Previous studies often focus on simpler linear formations.

Purpose of the Study:

• To model and analyze flow forces on cylinders in a V formation.
• To investigate the impact of formation angle, spacing, and cylinder number on drag and lift.
• To draw parallels between the V formation model and flocking bird dynamics.

Main Methods:

• Numerical modeling of two-dimensional square cylinders in V formation.
• Simulation of flow at a Reynolds number of 100.
• Analysis of drag coefficient, lateral force coefficient, and Strouhal number.

Main Results:

• Drag decreases with decreasing formation angle (alpha).
• The leading cylinder consistently has the lowest drag.
• Formation drag can be lower than isolated cylinder drag, indicating energy savings.
• Significant lateral forces are observed on the cylinders.

Conclusions:

• V formation offers potential aerodynamic benefits and energy savings.
• The model provides insights into the mechanics of formation flight, applicable to birds.
• Further research can explore more complex formations and flow conditions.