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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas ANTENNA WIND ANALYSIS PM#03 Torino - April 5 th - 6 th , 2006. Summary. Analysis Assumption and Input data. Mathematical model description. Analysis Results. Summary. Analysis Assumption and Input data.

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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas

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  1. Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas • ANTENNA WIND ANALYSIS • PM#03 Torino - April 5th- 6th, 2006

  2. Summary • Analysis Assumption and Input data • Mathematical model description • Analysis Results • Summary

  3. Analysis Assumption and Input data Geometrical model was generated starting from a Step file delivered by EIE • Bus structure was built according to the Step model • Apex structure was included in the model • Cabin and Yoke structure was partially simplified

  4. Analysis Assumption and Input data Antenna orientation (azimuth and Elevation angle) definied in accordance to ALMA spec 34000000-006-B-SPE para. 5.3.2.3.a Computation of the Non-repeatable Pointing Error induced by wind

  5. Analysis Assumption and Input data Reference Wind velocity equal to 9.5 m/s corresponding to Primary Night time Operative Conditions (including gust) Atmospheric boundary layer wind profile calculated by using a logaritmic law

  6. Mathematical model Wind analysis activity logic

  7. Mathematical model The dimension of the computation fluid domain was 120 * 70 *120 m to avoid blockage effect on the flow field calculation 42.5m 70 m 120 m 120 m 105 m 80 m

  8. Mathematical model Theanalysis was performed by using the Fluent suite CFD Code Overall computational grid includes about 800000 elements

  9. Mathematical model Antenna Surface grid

  10. Analysis Results

  11. Analysis Results– Case 1 Static Pressure [Pa] Azimuth 0 Elevation 0 wind direction Velocity vectors Contour plot Outline

  12. Analysis Results– Case 1 Pathline colored by Air velocity [m/s]

  13. Analysis Results– Case 1 Mesh size impact - Static Pressure [Pa] Coarse mesh Fine mesh

  14. Analysis Results– Case 1 Mesh size impact - Static Pressure [Pa] parabola front side at y=0 parabola front side at z=0

  15. Analysis Results– Case 1 Mesh size impact – Forces wind on the elevation structure [Pa] Good agreement between the coarse and fine mesh analysis results Discrepancies between coarse and fine mesh lower than 10%.

  16. Analysis Results– Case 2 Static pressure (Pa) Azimuth 60 Elevation 0 Outline wind direction

  17. Analysis Results– Case 2 Pathline colored by Air velocity [m/s]

  18. Analysis Results– Case 3 Azimuth 120 Elevation 0 Static pressure (Pa) Outline wind direction

  19. Analysis Results– Case 3 Pathline colored by Air velocity [m/s]

  20. Analysis Results– Case 4 Azimuth 180 Elevation 0 Static pressure (Pa) Outline wind direction

  21. Analysis Results– Case 4 Pathline colored by Air velocity [m/s]

  22. Analysis Results– Case 5 Azimuth 45 Elevation 45 Static pressure (Pa) Outline wind direction

  23. Analysis Results– Case 5 Pathline colored by Air velocity [m/s]

  24. Analysis Results– Case 6 Azimuth 135 Elevation 45 Static pressure (Pa) Outline wind direction

  25. Analysis Results– Case 6 Pathline colored by Air velocity [m/s]

  26. Analysis Results– Case 7 Azimuth 0 Elevation 60 Static pressure (Pa) Outline wind direction

  27. Analysis Results– Case 7 Pathline colored by Air velocity [m/s]

  28. Analysis Results– Case 8 Azimuth 90 Elevation 60 Static pressure (Pa) Outline wind direction

  29. Analysis Results– Case 8 Pathline colored by Air velocity [m/s]

  30. Analysis Results– Case 9 Azimuth 180 Elevation 60 Static pressure (Pa) Outline wind direction

  31. Analysis Results– Case 9 Pathline colored by Air velocity [m/s]

  32. Analysis Results– Case 10 Azimuth 0 Elevation 90 Static pressure (Pa) Outline wind direction

  33. Analysis Results– Case 10 Pathline colored by Air velocity [m/s]

  34. Analysis Results– Case 11 Azimuth 90 Elevation 90 Static pressure (Pa) Outline wind direction

  35. Analysis Results– Case 11 Pathline colored by Air velocity [m/s]

  36. Analysis Results - Summary Antenna Elevation structure momentum and forces induced by wind

  37. Normal direction Side direction Axial direction Analysis Results - Summary Antenna Elevation structure momentum and forces induced by wind

  38. Analysis Results - Summary Antenna Apex structure momentum and forces induced by wind

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