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Prediction Of Transitional Boundary Layers And Fully Turbulent Free Shear Flows Using Reynolds Averaged Navier Stokes Models

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Prediction Of Transitional Boundary Layers And Fully Turbulent Free Shear Flows Using Reynolds Averaged Navier Stokes Models

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Author : Maurin Lopez
language : en
Publisher:
Release Date : 2014

Prediction Of Transitional Boundary Layers And Fully Turbulent Free Shear Flows Using Reynolds Averaged Navier Stokes Models written by Maurin Lopez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

One of the biggest unsolved problems of modern physics is the turbulence phenomena in fluid flow. The appearance of turbulence in a flow system is regularly determined by velocity and length scales of the system. If those scales are small the motion of the fluid is laminar, but at larger scales, disturbances appear and grow, leading the flow field to transition to a fully turbulent state. The prediction of transitional flow is critical for many complex fluid flow applications, such as aeronautical, aerospace, biomedical, automotive, chemical processing, heating and cooling systems, and meteorology. For example, in some cases the flow may remain laminar throughout a significant portion of a given domain, and fully turbulent simulations may produce results that can lead to inaccurate conclusions or inefficient design, due to an inability to resolve the details of the transition process. This work aims to develop, implement, and test a new model concept for the prediction of transitional flows using a linear eddy-viscosity RANS approach. The effects of transition are included through one additional transport equation for u2 as an alternative to the Laminar Kinetic Energy (LKE) framework. Here u2 is interpreted as the energy of fully turbulent, three-dimensional velocity fluctuations. This dissertation presents two new single-point, physics-based turbulence models based on the transitional methodology mentioned above. The first one uses an existing transitional model as a baseline which is modified to accurately capture the physics of fully turbulent free shear flows. The model formulation was tested over several boundary layer and free shear flow test cases. The simulations show accurate results, qualitatively equal to the baseline model on transitional boundary layer test cases, and substantially improved over the baseline model for free shear flows. The second model uses the SST k-w fully turbulent model and again the effects of transition are included through one additional transport equation for u2. An initial version of the model is presented here. Simplicity of the formulation and ease of extension to other baseline models are two potential advantages of the new method.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995-05

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-05 with Aeronautics categories.

Numerical Simulation Of Unsteady Flows And Transition To Turbulence

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Author : O. Pironneau
language : en
Publisher: Cambridge University Press
Release Date : 1992-07-31

Numerical Simulation Of Unsteady Flows And Transition To Turbulence written by O. Pironneau and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-07-31 with Mathematics categories.

This volume represents the findings of the first test cases considered by ERCOFTAC (European Research Consortium on Flow Turbulence and Combustion). The workshop, held in Lausanne, Switzerland, in 1990, studied five test cases which represent the interests of both the academic and industrial groups.

Applied Mechanics Reviews

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Author :
language : en
Publisher:
Release Date : 1948

Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Mechanics, Applied categories.

Nasa Technical Paper

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Author :
language : en
Publisher:
Release Date : 1990

Nasa Technical Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Science categories.

Nasa Technical Paper

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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1990

Nasa Technical Paper written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.