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Use of the Thompson wind tunnel data set – a few examples

Use of the Thompson wind tunnel data set – a few examples. Ruwim Berkowicz and Helge Rørdam Olesen. Excel workbooks. The subsequent charts are copied from Excel workbooks that are freely available through http://www.dmu.dk/International/Air/Models/Background/Thompson_Intro.htm

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Use of the Thompson wind tunnel data set – a few examples

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  1. Use of the Thompson wind tunnel data set – a few examples Ruwim Berkowicz and Helge Rørdam Olesen

  2. Excel workbooks • The subsequent charts are copied from Excel workbooks that are freely available through • http://www.dmu.dk/International/Air/Models/Background/Thompson_Intro.htm • Each workbook contains a chart, depicting a stack, a building and a concentration profile. • This chart is dynamic, so the user can vary the stack height or the stack location (using arrow keys in Excel). • The chart shows the resulting changes in concentrations according to both measurements and models.

  3. Layout of chart: Sketch of stack and building Wind Full-drawn black curve: Measured concentration at ground-level along a line through the center of the building. Both stack and building height is 150 units.

  4. The chart holds curves modelled by several models: AERMOD and OML (standard version).Dashed curves refer to situation without building Wind

  5. Cube building • The stack is at roof height. • We move the stack relative to the building. • In the Excel sheet, the building can be moved by simply pressing an arrow key. • The subsequent slides mimic the way the Excel sheets work.

  6. First, the building is 10 building heights downwind of the stack

  7. Moving closer: Watch Xs, indicating distance from the building’s upwind face to the stack, counted positive along X axis XS

  8. XS

  9. Effect of changing stack height • We consider a stack located at the center of the roof. • The building is a cube

  10. Stack at roof top (Hs = Hb)

  11. Elevated stack (Hs = 1.5 Hb)

  12. Even higher stack: Hs = 2 Hb

  13. Effect of changing building width – stack height 1.5 Hs

  14. Cube – measurements only

  15. Wide building (2 cubes)

  16. Very wide (4 cubes)

  17. Cube, including model results

  18. Wide building (2 cubes)

  19. Very wide building (4 cubes)

  20. Continue on your own... • Four Excel workbooks are available for download, one for each building. • See http://www.dmu.dk/International/Air/Models/Background/Thompson_Intro.htm

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