Related Experiment Video
Updated: Jan 5, 2026
09:58
Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
Published on: February 3, 2014
8.8K
Wall-Modeled Large-Eddy Simulation for Complex Turbulent Flows
Sanjeeb T Bose1,2, George Ilhwan Park3,4
1Cascade Technologies, Inc., Palo Alto, California 94303.
Annual Review of Fluid Mechanics
|October 22, 2019
Summary
Large-eddy simulation (LES) uses wall models to study turbulent flows, overcoming resolution limits near walls. This review examines novel models and their application to complex flow phenomena.
Area of Science:
- Fluid Dynamics
- Computational Science
Background:
- Turbulent flows are crucial in many engineering applications.
- Simulating high-Reynolds number boundary layers with Large-eddy simulation (LES) is computationally expensive due to near-wall eddy resolution requirements.
Purpose of the Study:
- To review recent advancements in wall-modeled LES.
- To assess the application of wall models to complex flow scenarios.
- To evaluate the accuracy of wall-model assumptions.
Main Methods:
- Review of recent investigations in wall-modeled LES.
- Analysis of novel approximate boundary conditions.
- Assessment of wall model applications in complex flows like separation and shock interactions.
- Evaluation of underlying assumptions in wall-model derivations.
Main Results:
- Wall models and approximate boundary conditions are essential for LES of high-Reynolds number flows.
- Wall models have been successfully applied to complex flows including boundary-layer separation and shock/boundary-layer interactions.
- The accuracy of wall-modeled LES is dependent on the validity of the underlying assumptions.
Conclusions:
- Wall-modeled LES is a viable approach for simulating unsteady turbulent flows.
- Further research is needed to refine wall models and their underlying assumptions for improved accuracy in complex flow simulations.
- Future studies should focus on developing more robust wall models and validating them across a wider range of flow conditions.
Related Concept Videos
01:07Laminar and Turbulent Flow
10.4K
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...
10.4K
01:24Turbulent Flow
621
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...
621
01:09Turbulent Flow: Problem Solving
361
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
361
01:30Typical Model Studies
595
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.
595
01:22Couette Flow
853
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
853
01:23Steady, Laminar Flow in Circular Tubes
962
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,...
962