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Related Experiment Video

Updated: Jul 30, 2025

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow

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Published on: February 4, 2011

A Modified Shielding and Rapid Transition DDES Model for Separated Flows.

Da Lei¹, Hui Yang^1,2, Yun Zheng¹

¹School of Energy and Power Engineering, Beihang University, Beijing 100191, China.

Entropy (Basel, Switzerland)

|May 16, 2023

Summary

This summary is machine-generated.

Detached Eddy Simulation (DES) issues like modeled stress depletion (MSD) and slow RANS to LES transition (RLT) are addressed. A new MSRT DDES method with adaptive shielding improves turbulence modeling in complex flows.

Keywords:

RANS-LES transition boundary layer shielding delayed detached eddy simulation entropy production gray area mitigation modeled stress depletion

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The Diffusion of Passive Tracers in Laminar Shear Flow

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Published on: May 1, 2018

Area of Science:

Computational Fluid Dynamics
Turbulence Modeling

Background:

Detached Eddy Simulation (DES) faces challenges including modeled stress depletion (MSD) and delayed transition from Reynolds-averaged Navier-Stokes (RANS) to Large Eddy Simulation (LES) (RLT).
Existing DES variants struggle to balance RANS and LES modes effectively, particularly in boundary layers and separated flows.

Purpose of the Study:

To develop and validate a modified Delayed DES (DDES) method, termed MSRT DDES, that addresses MSD and RLT problems.
To introduce an adaptive shielding strategy that adjusts based on local flow conditions to improve turbulence simulation accuracy.

Main Methods:

A novel adaptive shielding strategy is implemented within the DDES framework.
The MSRT DDES method was tested on three cases: a zero-pressure gradient turbulent boundary layer, flow over a hump, and corner separation in a compressor cascade.
Comparisons involved wall skin friction, velocity profiles, total pressure loss, and entropy production analysis.

Main Results:

The adaptive shielding strategy effectively ameliorates MSD in RANS boundary layers without mesh dependency.
Excessive shielding in resolved turbulence regions is avoided, facilitating better simulation of separated and reattached flows.
MSRT DDES moderately alleviates both MSD and RLT problems compared to standard DES.

Conclusions:

The proposed MSRT DDES with adaptive shielding offers a more physical and effective approach to resolving DES limitations.
This improved method enhances the accuracy of turbulence simulations in boundary layers and complex separated flow scenarios.