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Related Experiment Video

Updated: Oct 20, 2025

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System

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Published on: August 7, 2018

Spatial wake transition past a thin pitching plate.

Arnab Kumar De¹, Sandip Sarkar²

¹Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India.

Physical Review. E

|September 16, 2021

Summary

This summary is machine-generated.

The study reveals how a pitching plate

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Area of Science:

Fluid Dynamics
Aerodynamics
Flow Physics

Background:

Understanding wake dynamics is crucial for optimizing flapping foil propulsion.
The transition from drag to thrust in unsteady flows is complex and not fully understood.

Purpose of the Study:

To investigate the spatial transition of the wake behind a thin pitching plate in the thrust regime.
To identify the key parameters influencing the drag-to-thrust transition.

Main Methods:

Numerical simulation of a thin pitching plate in a fluid.
Analysis of wake structure in 2D and 3D.
Investigation of pressure gradients and flow instabilities.

Main Results:

A drag-to-thrust transition occurs at a critical pitching frequency, dependent on angle and aspect ratio.
2D wakes exhibit asymmetric vortex pairing, while 3D wakes show a bifurcated structure with a swirling ring.
The wake transitions through distinct regions: reverse von Kármán vortex street, transitional zone, and twin jet region.

Conclusions:

The spatial wake transition is characterized by specific vortex dynamics and pressure gradients.
3D effects lead to a bifurcated wake structure, distinct from 2D asymmetric vortex pairing.
The findings provide insights into the fundamental mechanisms governing thrust generation in unsteady flows.