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Comparison of Wind Tunnel and CFD Modelling for Nearfield Dispersion from an Exhaust Stack

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Ruth Shilston, RWDI

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Comparison of Wind Tunnel and CFD Modelling for Nearfield Dispersion from an Exhaust Stack

  1. 1. COMPARISON OF A WIND TUNNEL AND CFD MODELLING FOR NEARFIELD DISPERSION FROM AN EXHAUST STACK Ruth Shilston MEng CEng MIMechE IAQM DMUG 19th April 2018
  2. 2. 500+ employees Multi-disciplinary teams Senior scientists; engineers; specialists; meteorologists; engineering technologists; technicians; support staff International reputation Exclusive methods and equipment RWDI - Consulting Engineers & Scientists
  3. 3. Study Motivation
  4. 4. K-Omega Realizable K-Epsilon
  5. 5. RWDI study approach
  6. 6. Source R1 R2 Source R1 R2 Modelling Approach
  7. 7. Parameter Mesh size YES Turbulence model YES ABL treatment YES Building Roughness Steady State YES Unsteady LES 10H 5H 5H K-Omega Realizable K-Epsilon
  8. 8. 0.27 Million Cells 1.78 Million Cells 13.2 Million Cells
  9. 9. Study Results
  10. 10. R1 R2 Source North
  11. 11. K-omega K-epsilon RK-epsilon Mesh 1 Mesh 2 Mesh 3
  12. 12. Results: CFD vs Wind Tunnel North Wind R1 R2 Wind Tunnel
  13. 13. Results: CFD vs Wind Tunnel South Wind Wind Tunnel R1 R2
  14. 14. Results: CFD vs Wind Tunnel South Wind Mesh 1 – k-Omega Mesh 2 – k-Omega
  15. 15. Final Thoughts
  16. 16. Key Takeaways Complex flow features challenged the steady state CFD. Downwind receptors registered “hits” in both CFD and wind tunnel however CFD results had lower dilution. CFD was inconsistent when receptors were not downstream of source. In a real project, we would consider 36 wind directions to give a full assessment of the exhaust performance. As research matures guidelines should be established.
  17. 17. Questions

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