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picture1_Dynamics Pdf 157936 | Bakker 02 Post


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File: Dynamics Pdf 157936 | Bakker 02 Post
lecture 2 flow fields applied computational fluid dynamics instructor andre bakker http www bakker org andrebakker 2002 2006 fluent inc 2002 1 important variables pressure and fluid velocities are always ...

icon picture PDF Filetype PDF | Posted on 19 Jan 2023 | 2 years ago
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                        Lecture 2 - Flow Fields
             Applied Computational Fluid Dynamics
                            Instructor: André Bakker
     http://www.bakker.org
     ©AndréBakker (2002-2006)
     ©Fluent Inc. (2002)                                                    1
        Important variables
        •   Pressure and fluid velocities are always calculated in conjunction. 
            Pressure can be used to calculate forces on objects, e.g. for the 
            prediction of drag of a car. Fluid velocities can be visualized to 
            show flow structures.
        •   From the flow field we can derive other variables such as shear 
            and vorticity. Shear stresses may relate to erosion of solid 
            surfaces. Deformation of fluid elements is important in mixing 
            processes. Vorticity describes the rotation of fluid elements.
        •   In turbulent flows, turbulent kinetic energy and dissipation rate are 
            important for such processes as heat transfer and mass transfer 
            in boundary layers.
        •   For non-isothermal flows, the temperature field is important. This 
            may govern evaporation, combustion, and other processes.
        •   In some processes, radiation is important.
                                                                                                 2
        Post-processing
        •   Results are usually reviewed in one of two ways. Graphically or 
            alphanumerically. 
        •   Graphically:
             – Vector plots.
             – Contours. 
             – Iso-surfaces.
             – Flowlines.
             – Animation.
        •   Alphanumerics:
             – Integral values.
             – Drag, lift, torque calculations.
             – Averages, standard deviations.
             – Minima, maxima.
             – Compare with experimental data.
                                                                                                 3
     A flow field example: the football
     • Regulation size american football.
     • Perfect throw. Ball is thrown from right to left.
     • Flow field relative to the ball is from left to right.
     • Shown here are filled contours of velocity magnitude.
                                                       4
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...Lecture flow fields applied computational fluid dynamics instructor andre bakker http www org andrebakker fluent inc important variables pressure and velocities are always calculated in conjunction can be used to calculate forces on objects e g for the prediction of drag a car visualized show structures from field we derive other such as shear vorticity stresses may relate erosion solid surfaces deformation elements is mixing processes describes rotation turbulent flows kinetic energy dissipation rate heat transfer mass boundary layers non isothermal temperature this govern evaporation combustion some radiation post processing results usually reviewed one two ways graphically or alphanumerically vector plots contours iso flowlines animation alphanumerics integral values lift torque calculations averages standard deviations minima maxima compare with experimental data example football regulation size american perfect throw ball thrown right left relative shown here filled velocity magni...

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