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Related Concept Videos

Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Hydraulic Jump: Problem Solving01:16

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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Hydraulic Jump01:29

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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Hydrostatic Pressure Force on a Curved Surface01:04

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Updated: Apr 13, 2026

Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
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Hydrodynamically Controlled Active Escape Dynamics.

Wenjie Wei1, Shiyuan Hu2,3, Wenlong Chen1

  • 1Tsinghua University, State Key Laboratory of Chemical Engineering and Low-carbon Technology, Department of Chemical Engineering, Beijing 100084, China.

Physical Review Letters
|April 11, 2026
PubMed
Summary
This summary is machine-generated.

Hydrodynamic interactions critically influence active particle escape from potential barriers. This study reveals hydrodynamics-induced rotation and amplified barriers in complex fluids, enhancing understanding of nonequilibrium dynamics.

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Area of Science:

  • Soft Matter Physics
  • Complex Fluids
  • Statistical Mechanics

Background:

  • Active systems often escape potential barriers, influenced by hydrodynamic interactions.
  • The role of active hydrodynamics in nonequilibrium escape processes remains poorly understood.

Purpose of the Study:

  • To investigate the impact of hydrodynamics on the escape dynamics of active particles in macromolecular networks.
  • To elucidate the physical mechanisms underlying hydrodynamics-mediated nonequilibrium escape.

Main Methods:

  • Combined computational simulations and theoretical analysis.
  • Model system: active particles confined within macromolecular networks.

Main Results:

  • Hydrodynamic effects critically mediate escape dynamics.
  • Observed hydrodynamics-induced active rotation of particles.
  • Identified increased potential barriers due to long-ranged hydrodynamic interactions.

Conclusions:

  • Hydrodynamic interactions play a crucial role in active particle escape from confining potentials.
  • Derived analytical theories capture simulation results and explain underlying physics.
  • Findings offer insights into active escape dynamics in complex fluids and potential applications in controlling such dynamics.