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Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Fluid Pressure over Curved Plate of Constant Width01:12

Fluid Pressure over Curved Plate of Constant Width

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When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
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Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

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When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
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Fluid Pressure over Flat Plate of Constant Width01:05

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When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

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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:
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Updated: Mar 15, 2026

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
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Numerical Analysis of Hydrodynamics for Bionic Oscillating Hydrofoil Based on Panel Method.

Gang Xue1, Yanjun Liu1, Muqun Zhang1

  • 1Key Laboratory of High Efficiency and Clean Mechanical Manufacture, School of Mechanical Engineering, Shandong University, No. 17923, Jingshi Road, Jinan, Shandong 250061, China.

Applied Bionics and Biomechanics
|September 1, 2016
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Summary

This study introduces a bionic fish model using Slender-Body theory and the Panel method for accurate hydrodynamic analysis. The research reveals the significant impact of the caudal fin and phase angle on fish swimming performance.

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Area of Science:

  • Fluid dynamics
  • Bionics
  • Robotics

Background:

  • Fish swimming mechanisms are complex and not fully understood.
  • Bionic approaches offer insights into aquatic locomotion.
  • Accurate hydrodynamic modeling is crucial for understanding fish movement.

Purpose of the Study:

  • To develop a novel kinematics model for bionic fish swimming.
  • To analyze the hydrodynamic performance of flexible fish-like structures.
  • To investigate the influence of caudal fins and phase angles on swimming efficiency.

Main Methods:

  • Slender-Body theory for kinematics modeling.
  • Panel method for hydrodynamic performance analysis.
  • Gauss-Seidel method for solving Navier-Stokes equations.
  • Rapid prototyping for physical model creation.

Main Results:

  • The proposed model shows good agreement with commercial software (Fluent) and experimental data.
  • The caudal fin significantly influences trailing vortex shedding.
  • Phase angle is identified as a key factor in hydrodynamic performance.
  • Trailing vortex shapes align with theoretical assumptions under specific conditions.

Conclusions:

  • The numerical analysis provides valuable insights into fish swimming mechanisms.
  • The bionic model accurately simulates flexible fish deformation during swimming.
  • This research advances the understanding of fluid-structure interaction in aquatic locomotion.