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Tandem Cylinder Simulations using the Method of Your Choice

Tandem Cylinder Simulations using the Method of Your Choice. Some Body Affiliated Somewhere. EMail. Outline. Objectives Numerical Method Flow Conditions Grids Results Computational Resources Observations. Objectives.

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Tandem Cylinder Simulations using the Method of Your Choice

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  1. Tandem Cylinder Simulationsusing the Method of Your Choice Some Body Affiliated Somewhere EMail

  2. Outline • Objectives • Numerical Method • Flow Conditions • Grids • Results • Computational Resources • Observations

  3. Objectives • State any objectives such as testing numerical method, turbulence model, grid convergence, etc

  4. Equations solved Unsteady Reynolds-averaged Navier-Stokes (URANS) equations Turbulence equations Spatial and temporal discretizations Type of scheme (FD, FV, etc) Design accuracy Unique features of implementation Boundary Conditions Numerical Method

  5. Flow Conditions in Simulations • Re = 166,000 based on D • Turbulence model run fully turbulent • Surface roughness strip placed at q = 50 deg. • M = 0.128

  6. Grids • Grid type (block-structured, unstructured, Cartesian) • # of Nodes or cells or … • Extent of grid (in plane and spanwise directions)

  7. Results: • Time step (in seconds) • Number of time steps run (total and for sampling) • Shedding frequency in Hz • Time-averaged Drag (CD = fD/(D 0.5 ro |Vo|2) where fD is the force per unit span in the drag or streamwise direction, D = cylinder diameter) on front and rear cylinders • Convergence information (e.g. history of Cprms after every 5000 time steps)

  8. Surface Pressure Upstream Downstream

  9. RMS of Surface Pressure Upstream Downstream

  10. Mean Velocity • Along y/D=0 Aft of Downstream Cylinder Gap Region

  11. Surface Pressure Spectra • Power Spectral Density Downstream, q = 45o Upstream, q = 135o

  12. Computational Resources • Computer hardware • CPU (type and number used) • Interconnect • Resources • CPU (or wall clock) Time / time step • # of time steps in simulation • CPU (or wall clock) Time / 1 sec of simulation time • # of time steps needed for 1 sec of simulation time • Memory used • Per cpu • Total

  13. Observations • What did you learn? • Computational challenges • New insights into the physics • Assessment of state-of-the-art based on your simulation for the problem category of interest • Benchmark deficiencies • Recommendations for follow-on efforts • Additional measurements • Desired additions/modifications to problem statement • Procedures for computations or measurements

  14. OPTIONAL

  15. Surface Pressure Correlation • Spanwise row of sensors at q=135 deg Dz Downstream Upstream

  16. Surface Pressure Coherence • Spanwise row of sensors at q=135 deg • Coherence at shedding frequency = 178 Hz Dz Downstream Upstream

  17. 2D TKE • 1/2 (u' u' + v' v' + w' w')/)/Vo2 Aft of Downstream Cylinder Gap Region

  18. 2D TKE • 1/2 (u' u' + v' v' + w' w')/)/Vo2 along y/D=0 Aft of Downstream Cylinder Gap Region

  19. 2D TKE 1/2 (u' u' + v' v' + w' w')/)/Vo2 Gap Region, x/D=1.5 Aft of Downstream Cylinder, x/D=4.45

  20. Acoustic Radiation • Significant peaks at harmonics Spectra

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