How to evaluate the difference of a local variable to its circumferential averaged value on a Turbo Surface?

This can be achieved with the following steps:
` Initialize the turbo components
` Generate a Turbo Surface: Location > Turbo Surface
` Define the Turbo Surface as required, e.g.:
o Geometry > Method > Constant Streamwise Location
o Color
? Variable: Velocity
? Circ Average: Length
? Max Samples: 100
o Apply
` When you click on ``` a new variable named `Velocity LCA on Turbo Surface 1` occurs *
` Create an Expression: Insert > Expression > exp1 = Velocity - Velocity LCA on Turbo Surface 1 > Apply
` Create a Variable: Insert > Variable > var1 > Expression: exp1 > Apply
` Go to the Turbo Surface again
o Variable: var1
o Circ Average: None
o Apply

The difference is now displayed on the turbo surface.

* The abbreviation LCA means circumferentail averaging by length:
When the Circ. Average setting is set to Length, circumferential averaging of values at a sampling point is carried out internally by forming a circular arc, centered about the turbo axis, passing through the sampling point. Values are interpolated to n equally-spaced locations along the arc, using values from nearby nodes, where n is a number that is inversely proportional to the mesh length scale, and limited by the Max. Samples setting. The n values are then averaged in order to obtain a single, circumferentially-averaged value for the sampling point.

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