Prediction Of Transitional Boundary Layers And Fully Turbulent Free Shear Flows Using Reynolds Averaged Navier Stokes Models PDF Download
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Author | : Maurin Lopez |
Publisher | : |
Total Pages | : 105 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Prediction of Transitional Boundary Layers and Fully Turbulent Free Shear Flows, Using Reynolds Averaged Navier-Stokes Models Book in PDF, ePub and Kindle
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.
Author | : |
Publisher | : |
Total Pages | : 426 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : O. Pironneau |
Publisher | : Cambridge University Press |
Total Pages | : 536 |
Release | : 1992-07-31 |
Genre | : Mathematics |
ISBN | : 9780521416184 |
Download Numerical Simulation of Unsteady Flows and Transition to Turbulence Book in PDF, ePub and Kindle
The workshop concentrated on the following turbulence test cases: T1 Boundary layer in an S-shaped duct; T2 Periodic array of cylinders in a channel; T3 Transition in a boundary layer under the influence of free-stream turbulence; T4 & T5: Axisymmetric confined jet flows.
Author | : |
Publisher | : |
Total Pages | : 592 |
Release | : 1974 |
Genre | : Mechanics, Applied |
ISBN | : |
Download Applied Mechanics Reviews Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 52 |
Release | : 1990 |
Genre | : Science |
ISBN | : |
Download NASA Technical Paper Book in PDF, ePub and Kindle
Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : 380 |
Release | : 1990 |
Genre | : Aeronautics |
ISBN | : |
Download NASA Technical Paper Book in PDF, ePub and Kindle
Author | : American Society of Mechanical Engineers. Fluids Engineering Division. Summer Meeting |
Publisher | : |
Total Pages | : 260 |
Release | : 1994 |
Genre | : Science |
ISBN | : |
Download Boundary Layer and Free Shear Flows Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 248 |
Release | : 1984 |
Genre | : Aeronautics, Military |
ISBN | : |
Download FY ... US Air Force Plan for Defense Research Sciences Book in PDF, ePub and Kindle
Author | : Sverre Steen |
Publisher | : MDPI |
Total Pages | : 454 |
Release | : 2020-12-29 |
Genre | : Science |
ISBN | : 3039362488 |
Download Selected Papers from the Sixth International Symposium on Marine Propulsors Book in PDF, ePub and Kindle
Marine propulsors are key components of the many thousands of ships and boats operating in oceans, lakes, and rivers around the world. The performance of propulsors are important for the environmental impact of ships, underwater noise impact on aquatic fauna, and crew and passenger comfort and safety. This book presents nineteen papers devoted to the hydrodynamics of different types of marine propulsors (conventional propellers, thrusters, and novel solutions). Most of the papers are extended papers from the sixth International Symposium on Marine Propulsors (SMP 2019). Several of the papers deal with cavitation, vortices, and energy saving devices. The papers present high-quality research performed using Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD) as well Artificial Intelligence (AI).
Author | : Vallampati Ramachandra Prasad |
Publisher | : BoD – Books on Demand |
Total Pages | : 236 |
Release | : 2020-01-22 |
Genre | : Mathematics |
ISBN | : 1839681853 |
Download Boundary Layer Flows Book in PDF, ePub and Kindle
Written by experts in the field, this book, "Boundary Layer Flows - Theory, Applications, and Numerical Methods" provides readers with the opportunity to explore its theoretical and experimental studies and their importance to the nonlinear theory of boundary layer flows, the theory of heat and mass transfer, and the dynamics of fluid. With the theory's importance for a wide variety of applications, applied mathematicians, scientists, and engineers - especially those in fluid dynamics - along with engineers of aeronautics, will undoubtedly welcome this authoritative, up-to-date book.