CFD Apps: Presentation of the Urban Wind Study App

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CFD Apps - https://cfdapps.appspot.com - is a webbased portal for undertaking application specific Computational Fluid Dynamics (CFD) simulation. This presentation presents the recently released app that targets the simulation of wind in urban environment. The presentation covers the following subjects:
- Why undertake a CFD study of urban wind environment?
- How does the Urban Wind Study App work?
- Two validation cases where the CFD Apps results are compared to experimental results;
- A discussion of security aspects associated with the use of CFD Apps that users should be aware of.

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CFD Apps: Presentation of the Urban Wind Study App

  1. 1. CFD Apps, a Webportal for CFD Modelling Urban Wind Study Presentation
  2. 2. Presentation Outline 1.CFD Based Wind Study 2.CFD Apps
  3. 3. CFD Based Wind Study Why simulating the wind environment in urban settings? Pedestrian comfort Pollution dispersion Wind turbine assessment
  4. 4. CFD Based Wind Study • Pedestrian comfort: • Evaluate the mean wind speed and gust speed at pedestrian level; • Compare predicted wind velocity to benchmark(s). Lawson Comfort Classification Mean Wind Velocity (m/s) Location 5 0-2 m/s Seating area 6 and 7 2-6 m/s Entrance to building 8 6-8 m/s Pedestrian footpath, public spaces 9 8-10 m/s Around building 10 10-12 m/s Roads and car park Lawson criteria, taken from CFD Simulation of Wind Comfort and Safety in Urban Area: A Case Study of Coventry University Central Campus, Fadl, M. and Karadelis, J., International Journal of Architecture, Engineering and Construction, June 2013
  5. 5. CFD Based Wind Study • Setup up - Digital Model Source: Feasibility Study for Establishment of Air Ventilation Assessment System, Department of Architecture Chinese University of Hong Kong, November 2005
  6. 6. CFD Based Wind Study • Setup up - Computational Domain Extent  
  7. 7. CFD Based Wind Study • Meshing • Resolve geometrical features; • Meet wall functions requirements - ie y+; • Cost-effectiveness. • Boundary Conditions • Representation of neutral Atmospheric Boundary Layer using: – Log law; or – Power law.
  8. 8. CFD Based Wind Study • Guidelines: • Feasibility Study for Establishment of Air Ventilation Assessment System, Department of Architecture Chinese University of Hong Kong, November 2005 http://www.pland.gov.hk/pland_en/p_study/comp_s/avas/papers&re ports/final_report.pdf • ERCOFTAC QNET-CFD Wiki http://uriah.dedi.melbourne.co.uk/w/index.php/Civil_Construction_an d_HVAC • Guidebook for Practical Applications of CFD to Pedestrian Wind Environment around Buildings, Architectural Institute of Japan http://www.aij.or.jp/jpn/publish/cfdguide/index_e.htm • SIG on "Quality and Trust in Industrial CFD", Best Practice Guidelines, ERCOFTAC, January 2000 http://www.ercoftac.org/publications/ercoftac_best_practice_guidelines/singl e-phase_flows_spf/
  9. 9. CFD Apps URL: https://cfdapps.appspot.com
  10. 10. CFD Apps openFoam setup generation Cost: Free Analysis Cost: AU$20 per scenario • Solution based mesh refinement; • Solver speed-up through use of multiple meshes; • On the fly automated post-processing (basic).
  11. 11. CFD Apps Submission confirmation Select the analysis type
  12. 12. CFD Apps Live demonstration https://cfdapps.appspot.com
  13. 13. CFD Apps V&V • AIJ Case D: A high-rise building in city blocks View online results
  14. 14. CFD Apps V&V • AIJ Case D: A high-rise building in city blocks 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 Average error: • CFD vs Fiber probe: 0.6m/s • CFD vs Thermintor: 0.8m/s • Fiber probe vs Thermintor: 0.7m/s
  15. 15. CFD Apps V&V • AIJ Case E: Building complexes with simple building shape (Niigata) View before construction results View after construction results
  16. 16. CFD Apps V&V • AIJ Case E: Building complexes with simple building shape (Niigata) 1 8 7 6 5 4 3 2 9 10 13 15 14 12 11 19 17 18 16 20 26 25 24 23 22 21 30 2928 27 34 33 32 31 40 39 38 37 36 35 46 45 44 43 42 41 51 50 49 48 47 55 54 53 52 58 57 56 80 60 59 69 68 67 66 65 64 63 61 62 78 77 76 75 74 73 72 71 70 79 Experimental CFD Before Construction Vr = 0.343±0.129 Vr = 0.260±0.151 After Construction Vr = 0.421±0.163 Vr = 0.289±0.140 Velocity Ratio Results Averaged over 80 Test Locations
  17. 17. CFD Apps - Security Security is lightweight to facilitate ease of use. • Security relies on use of "complex" UUID and time limited storage • Identification is through email address no registration = no password • Payment details are not kept on our server and are secure; • Uploaded geometry is stored on secured cloud storage; • Analysis result case is stored on secured cloud storage, but is access through a time-limited public URL emailed to the user; • Analysis result page is stored on a public URL for 30 days.
  18. 18. CFD Apps Thank you Question(s)? Contact us at info@hibouscientificsoftware.com.au

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