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Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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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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Laminar Flow01:27

Laminar Flow

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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
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Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

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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...
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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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Large-Eddy Simulation of Thermally Stratified Atmospheric Boundary-Layer Flow Using a Minimum Dissipation Model.

Mahdi Abkar1,2, Parviz Moin2

  • 1Department of Engineering, Aarhus University, Inge Lehmanns Gade 10, 8000 Aarhus C, Denmark.

Boundary-Layer Meteorology
|October 22, 2019
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A new generalized minimum dissipation model enhances simulations of atmospheric boundary layers by including buoyant forces. This robust model accurately predicts turbulent fluxes with low computational cost, even at coarse resolutions.

Keywords:
Atmospheric boundary layerLarge-eddy simulationSubfilter modelling

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Area of Science:

  • Fluid dynamics
  • Atmospheric science
  • Computational modeling

Background:

  • Turbulent fluxes in atmospheric boundary layers are crucial for weather and climate.
  • Existing models often lack accuracy in stratified conditions.
  • Minimum dissipation models offer a promising approach for subfilter turbulence.

Purpose of the Study:

  • To generalize a minimum dissipation model for subfilter turbulent fluxes.
  • To implement and validate the generalized model in simulating thermally stratified atmospheric boundary-layer flows.
  • To assess the model's performance regarding computational efficiency, theoretical consistency, and accuracy.

Main Methods:

  • Development of a generalized minimum dissipation model incorporating buoyant forces.
  • Implementation of the model in computational fluid dynamics simulations.
  • Validation against empirical correlations, theoretical predictions, and field observations.

Main Results:

  • The generalized model accurately simulates thermally stratified atmospheric boundary-layer flows.
  • It shows remarkable agreement with established data and predictions.
  • The model demonstrates robustness and minimal sensitivity to grid resolution.

Conclusions:

  • The generalized minimum dissipation model provides an accurate and efficient tool for atmospheric boundary-layer simulations.
  • It effectively captures the influence of buoyancy on turbulence.
  • The model's robustness makes it suitable for practical applications with coarse resolutions.