National Environmental Research Institute, University of Aarhus, Denmark

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

Ruwim Berkowicz and Helge Rørdam Olesen

National Environmental Research Institute, University of Aarhus, Denmark

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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.

National Environmental Research Institute, University of Aarhus, Denmark

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Layout of chart: Sketch of stack and building

Hs=150 Hb=150 Wb=150 Lb=150

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Xs=-150 AerMod Xs=-150 OML Xs=-150 no building AerMod no building OML no 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.

National Environmental Research Institute, University of Aarhus, Denmark

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

Wind

Hs=150 Hb=150 Wb=150 Lb=150

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Xs=-150 AerMod Xs=-150 OML Xs=-150no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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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.

National Environmental Research Institute, University of Aarhus, Denmark

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

Hs=150 Hb=150 Wb=150 Lb=150

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Xs=-1500 (.missing.) (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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

Hs=150 Hb=150 Wb=150 Lb=150

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Xs=-1200 (.missing.) (.missing.)no building AerMod no building OML no building

XS

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=-900 AerMod Xs=-900 (.missing.)no building AerMod no building OML no building

XS

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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1.5

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=-600 (.missing.) (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=-300 AerMod Xs=-300 OML Xs=-300no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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0.5

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=-150 AerMod Xs=-150 OML Xs=-150no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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Xs=0 AerMod Xs=0 OML Xs=0no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=150 AerMod Xs=150 OML Xs=150no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=300 AerMod Xs=300 OML Xs=300no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=600 AerMod Xs=600 (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=900 AerMod Xs=900 (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=1200 (.missing.) (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=1500 (.missing.) (.missing.)no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Effect of changing stack height

• We consider a stack located at the center of the roof.

• The building is a cube

National Environmental Research Institute, University of Aarhus, Denmark

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Stack at roof top (Hs = Hb)

Hs=150 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Elevated stack (Hs = 1.5 Hb)

Hs=225 Hb=150 Wb=150 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Even higher stack: Hs = 2 Hb

Hs=300 Hb=150 Wb=150 Lb=150

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-1500 -1000 -500 0 500 1000 1500 2000 2500 3000

Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Effect of changing building width – stack height 1.5 Hs

National Environmental Research Institute, University of Aarhus, Denmark

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Cube – measurements only

Hs=225 Hb=150 Wb=150 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Wide building (2 cubes)

Hs=225 Hb=150 Wb=300 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Very wide (4 cubes)

Hs=225 Hb=150 Wb=600 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Cube, including model results

Hs=225 Hb=150 Wb=150 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Wide building (2 cubes)

Hs=225 Hb=150 Wb=300 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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Very wide building (4 cubes)

Hs=225 Hb=150 Wb=600 Lb=150

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Xs=75 AerMod Xs=75 OML Xs=75no building AerMod no building OML no building

National Environmental Research Institute, University of Aarhus, Denmark

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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