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Fluent-Intro_14.5_L07_Turbulence.pdf

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Lecture 7 Turbulence 14.5 Release Introduction to ANSYS Fluent © 2012 ANSYS, Inc. November 15, 2012 1 Release 14.5 Introduction Lecture Theme: The majority of engineering flows are turbulent. Successfully simulating such flows requires understanding a few basic concepts of turbulence theory and modeling. This allows one to make the best choice from the available turbulence models and near-wall options for any given problem. Learning Aims: You will learn: ãBasic turbulent flow and turbulen
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  © 2012 ANSYS, Inc. November 15, 2012 1 Release 14.5   14.5 Release Introduction to ANSYS Fluent Lecture 7 Turbulence   © 2012 ANSYS, Inc. November 15, 2012 2 Release 14.5 Lecture Theme: The majority of engineering flows are turbulent. Successfully simulating such flows requires understanding a few basic concepts of turbulence theory and modeling. This allows one to make the best choice from the available turbulence models and near-wall options for any given problem. Learning Aims: You will learn: ã Basic turbulent flow and turbulence modeling theory ã Turbulence models and near-wall options available in Fluent ã How to choose an appropriate turbulence model for a given problem ã How to specify turbulence boundary conditions at inlets Learning Objectives: You will understand the challenges inherent in turbulent flow simulation and be able to identify the most suitable model and near-wall treatment for a given problem. Introduction Introduction Theory Models Near-Wall Treatments Inlet BCs Summary  © 2012 ANSYS, Inc. November 15, 2012 3 Release 14.5 ã Flows can be classified as either : Laminar (Low Reynolds Number) Transition (Increasing Reynolds Number) Turbulent (Higher Reynolds Number) Observation by Osborne Reynolds Introduction Theory Models Near-Wall Treatments Inlet BCs Summary  © 2012 ANSYS, Inc. November 15, 2012 4 Release 14.5 Observation by Osborne Reynolds ã The Reynolds number is the criterion used to determine whether the flow is laminar or turbulent ã The Reynolds number is based on the length scale of the flow: ã Transition to turbulence varies depending on the type of flow: ã External flow ã along a surface : Re X  > 500 000   ã around on obstacle : Re L  > 20 000   ã Internal flow : Re D  > 2 300   . .Re  L U L      etc. ,d d, x,L hyd  Introduction Theory Models Near-Wall Treatments Inlet BCs Summary
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