CompressibleBeddoesLeishmanModel
https://bladednextgen.dnv.com/schema/0.4.1/Settings/AerodynamicSettings/DynamicStall/CompressibleBeddoesLeishmanModel.json
The compressible Beddoes Leishman dynamic stall model.
DynamicStallType: string =CompressibleBeddoesLeishmanModelUseDynamicPitchingMomentCoefficient: booleanStartingRadius: numberEndingRadius: numberSeparationTimeConstant: numberUseLinearFitGradientMethod: booleanUseKirchoffFlow: booleanUseImpulsiveContributions: booleanPressureLagTimeConstant: numberVortexLiftTimeConstant: numberVortexTravelTimeConstant: numberAttachedFlowConstantA1: numberAttachedFlowConstantA2: numberAttachedFlowConstantB1: numberAttachedFlowConstantB2: number
A type of DynamicStall
Properties
UseDynamicPitchingMomentCoefficient: boolean, optional
If true, the dynamic pitching moment coefficient will be used. This option is enabled by default. It is not recommended to disable this option for blades with a torsional degree of freedom because the so-called 'pitch- rate damping' term of the moment coefficient is typically important to keep the blade torsional mode stable.
default = True
StartingRadius: number, optional
The fraction of the radius outboard of which the dynamic stall model will be used. A value of 0.0 means that dynamic stall is applied from the blade root.
default = 0.0
EndingRadius: number, optional
The fraction of the radius outboard of which the dynamic stall model will be switched off. A value of 1.0 means that dynamic stall is applied until the blade tip.
default = 0.95
SeparationTimeConstant: number, optional
A dimensionless time constant, given in terms of the time taken to travel half a chord. It defines the lag in the movement of the separation point due to unsteady pressure and boundary layer response.
default = 3.0
UseLinearFitGradientMethod: boolean, optional
If true, the linear fit polar gradient is used to reconstruct the inviscid polar data. The fit is performed only within the linear polar regime that is searched automatically between the zero lift AoA to AoA = 7 deg. This approach is more suitable for polar data sets where the lift coefficient slope is not straight around 0 deg angle of attack. It is recommended to activate this option for more accurate computations. This option is turned on by default.
default = True
UseKirchoffFlow: boolean, optional
If true,the normal force coefficient is computed using the dynamic separation position in Kirchoff's equation directly. If false, the dynamic separation position is used to linearly interpolate between fully separated and fully attached flow. In normal operating conditions this setting will not lead to significant differences, but it has been found that in parked/idling cases (where the blade experiences high angles of attack) this option will improve the aerodynamic damping of the blade. The explanation for the damping differences is given in the aerodynamic validation document on the User Portal.
default = False
UseImpulsiveContributions: boolean, optional
Enabling the impulsive contributions in lift and moment coefficient.
default = False
PressureLagTimeConstant: number, optional
The lag between the pressure and the lift.
default = 1.7
VortexLiftTimeConstant: number, optional
The rate of decay of the vortex induced lift that is generated when airfoils undergo a rapid change in angle of attack towards positive or negative stall.
default = 6.0
VortexTravelTimeConstant: number, optional
The time constant that controls the duration of the vortex induced lift that is generated when airfoils undergo a rapid change in angle of attack towards positive or negative stall.
default = 7.5
AttachedFlowConstantA1: number, optional
The constant A1 for the Beddoes-Leishman type dynamic stall model to control the attached flow states.
default = 0.165
AttachedFlowConstantA2: number, optional
The constant A2 for the Beddoes-Leishman type dynamic stall model to control the attached flow states.
default = 0.335
AttachedFlowConstantB1: number, optional
The constant B1 for the Beddoes-Leishman type dynamic stall model to control the attached flow states.
default = 0.0455
AttachedFlowConstantB2: number, optional
The constant B2 for the Beddoes-Leishman type dynamic stall model to control the attached flow states.
default = 0.3
DynamicStallType: string
Defines the specific type of DynamicStall model in use. For a CompressibleBeddoesLeishmanModel object, this must always be set to a value of CompressibleBeddoesLeishmanModel.