Related Experiment Video
Updated: Jul 7, 2025
10:53
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
7.0K
Dataset of turbulent flow over interacting barchan dunes
Jimmy G Alvarez1, Danilo S Borges1, Erick M Franklin1
1Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas (UNICAMP), Rua Mendeleyev, 200, Campinas, SP 13083-860, Brazil.
Data in Brief
|December 28, 2023
Summary
This study presents experimental data on water flow over barchan dunes, both isolated and interacting. The findings offer valuable datasets for understanding dune dynamics and fluid mechanics.
Area of Science:
- Geomorphology
- Fluid Dynamics
- Planetary Science
Background:
- Barchans are crescent-shaped dunes found on Earth and Mars.
- Dune interactions significantly influence their morphology and migration.
- Understanding subaqueous dune behavior is crucial for coastal and planetary studies.
Purpose of the Study:
- To experimentally investigate the fluid flow dynamics over isolated and interacting subaqueous barchans.
- To provide comprehensive datasets for benchmarking and further research on dune-fluid interactions.
Main Methods:
- Experiments conducted in a transparent rectangular channel with turbulent water flow.
- Utilized low-frequency Particle Image Velocimetry (PIV) and high-frequency Particle Tracking Velocimetry (PTV).
- Collected instantaneous flow fields, mean flow, trajectories, and second-order moments.
Main Results:
- Detailed flow field data for single and paired barchans.
- Quantified mean flow patterns and particle trajectories around dunes.
- Computed second-order moments characterizing flow turbulence.
Conclusions:
- The study provides a rich dataset for analyzing barchan dune-fluid interactions.
- The data can be used for validating numerical models and developing new processing techniques.
- Contributes to a better understanding of aeolian and subaqueous dune dynamics.
More Related Videos
Related Concept Videos
01:24Turbulent Flow
193
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
193
01:07Laminar and Turbulent Flow
8.5K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
8.5K
01:27Uniform Depth Channel Flow
76
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
76
01:30Bernoulli's Equation for Flow Along a Streamline
974
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
974
01:24Rapidly Varying Flow
63
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
63
01:18Uniform Depth Channel Flow: Problem Solving
66
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
66