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*BEDDOES-LEISHMAN

Purpose

To specify the Beddoes Leishmann unsteady aerodynamic modeling options.

Theory

Refer to AeroDyn Overview for further information.

Keyword Format

Two lines of data, defining Beddoes Leishmann options as follows:

UAMOD=Unsteady Model

FLOOKUP=Separation Distance Lookup

UAStartRad=Starting rotor radius for dynamic stall (fraction)

UAEndRad=Ending rotor radius for dynamic stall (fraction)

 

 

Unsteady Model determines the unsteady aerodynamic model. Setting Unsteady Model to 1 enables the original theoretical developments of Beddoes-Leishmann, 2 enables the extensions to Beddoes-Leishmann developed by González, and 3 enables the extensions to Beddoes-Leishmann developed by Minnema/Pierce.

Separation Distance Lookup determines how the nondimensional separation distance value, f’, will be calculated. When Separation Distance Lookup is set to 1, f’ is determined via a lookup into the static lift-force coefficient and drag-force coefficient data. Note that Separation Distance Lookup must be 1 in this version of AeroDyn (v15.02.04).

UAStartRad is the starting rotor radius where dynamic stall will be turned on. Enter a number between 0 and 1, representing a fraction of rotor radius, to indicate where unsteady aerodynamics should begin turning on. If omitted, it defaults to 0 (the blade root). All blade nodes that are located at a rotor radius less than UAStartRad will have unsteady aerodynamics turned off for the entire simulation.

UAEndRad is the ending rotor radius where dynamic stall will be turned on. Enter a number between 0 and 1, representing a fraction of rotor radius, to indicate the last rotor radius where unsteady aerodynamics should be turned on. If omitted, it defaults to 1 (the blade tip). All blade nodes that are located at a rotor radius greater than UAEndRad will have unsteady aerodynamics turned off for the entire simulation.

Table Input