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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 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 • 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.
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.
The chart holds curves modelled by several models: AERMOD and OML (standard version).Dashed curves refer to situation without building Wind
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.
First, the building is 10 building heights downwind of the stack
Moving closer: Watch Xs, indicating distance from the building’s upwind face to the stack, counted positive along X axis XS
Effect of changing stack height • We consider a stack located at the center of the roof. • The building is a cube
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