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Related Experiment Video

Updated: Nov 21, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

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Published on: February 22, 2018

Application of an Intermittency Model for Laminar, Transitional, and Turbulent Internal Flows.

J P Abraham¹, E M Sparrow², J M Gorman²

¹School of Engineering, University of St. Thomas, 2115 Summit Avenue, St. Paul, MN 55105-1079

Journal of Fluids Engineering

|January 13, 2021

Summary

A new turbulence model accurately predicts fluid flow transitions using a single equation for turbulence intermittency. This model is effective for both internal and external flows across a wide range of Reynolds numbers.

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Last Updated: Nov 21, 2025

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Published on: February 22, 2018

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Area of Science:

Fluid Dynamics
Turbulence Modeling

Background:

Predicting transitional flow regimes remains a challenge in computational fluid dynamics.
Existing models often require complex formulations or multiple equations.

Purpose of the Study:

To adapt and validate a turbulence intermittency model for internal fluid flow applications.
To assess the model's performance across laminar, transitional, and turbulent regimes.

Main Methods:

A single transport equation for turbulence intermittency was utilized.
Model constants were adjusted for internal flow applications.
The model was tested on circular tubes, parallel plates, and tubes with diameter changes.

Main Results:

Successful application to internal flows with Reynolds numbers from 100 to 100,000.
Accurate prediction of fully developed friction factors for the entire Reynolds number range.
Accurate prediction of velocity profiles in laminar and turbulent flow regimes.

Conclusions:

The modified turbulence intermittency model provides a robust and versatile tool for analyzing diverse fluid flow conditions.
The model's ability to handle combined flow regimes simplifies complex flow simulations.