Turbulence Intensity Calculated Column

For every wind speed data column that has an associated standard deviation data column, Windographer automatically defines a calculated data column containing the turbulence intensity (TI) in every time step. The TI in any time step is defined as the wind speed standard deviation in that time step divided by the mean wind speed in that time step.

You can view the turbulence intensity column in all the graphic and tabular formats that Windographer provides for any other data column. But the main reason that Windographer generates this calculated column is for use in the Turbulence window.

Whenever you change a column containing wind speed or wind speed standard deviation data, for example by flagging a segment, deleting a segment, applying a scale factor, or appending more data, Windographer will re-calculate the TI data column, and any other calculated column that depends on those data columns. The calculated TI data column inherits the flagged status of its precursor data columns, so if you flag a segment of the speed column with some flag, Windographer will automatically apply that same flag to the corresponding segment of the calculated TI data column as well. You cannot flag a calculated column directly, so any flags that apply to a calculated TI column originate from this inheritance mechanism.

Check the checkbox if you wish to apply the Larsen & Hansen turbulence detrending algorithm to this data column.