Unsteady aerodynamics model definition

@UNSTEADY_AERODYNAMICS_MODEL_DEFINITION {
@UNSTEADY_AERODYNAMICS_MODEL_NAME {UaModlName} {
@UNSTEADY_AERODYNAMICS_MODEL_TYPE {UaModlType}
@PETERS_DATA {
@QUASI_STEADY {YES/NO}
@PROFILE_DRAG_AIRLOADS {YES/NO}
@REVERSE_FLOW_MODEL {RfModl}
@ONERA_DYNAMIC_STALL {YES/NO}
}
@LEISHMAN_BEDDOES_DATA {
@SEPARATED_FLOW_MODEL {YES/NO}
@PROFILE_DRAG_AIRLOADS {YES/NO}
@DYNAMIC_STALL_MODEL {YES/NO}
@ONERA_DYNAMIC_STALL {YES/NO}
}
@MORRISON_DATA {
@QUASI_STEADY {YES/NO}
@PROFILE_DRAG_AIRLOADS {YES/NO}
}
@COMMENTS {CommentText}
}
}

NOTES

  1. When using an internal aerodynamic model, it is necessary to defined an unsteady aerodynamics model, UaModlName.
  2. Different unsteady aerodynamics models can be used, depending on the value of the parameter UaModlType. Two options are possible.
    1. If UaModlType = PETERS, the aerodynamic forces at the airstations will be computed using two-dimensional unsteady airfoil theory of Peters.
    2. If UaModl = LEIHSMAN_BEDDOES, the aerodynamic forces at the airstations will be computed using two-dimensional unsteady airfoil theory of Leishman and Beddoes.
    3. If UaModl = MORRISON, the aerodynamic forces at the airstations will be computed using two-dimensional unsteady theory of Morrison.
  3. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

Peters unsteady aerodynamics model

The following data can be specified when using the Peters unsteady aerodynamics model.

  1. If flag @QUASI_STEADY = YES, the quasi-steady version of Peters model is used, i.e., unsteady aerodynamic terms are ignored. (Default value: @QUASI_STEADY = NO).
  2. If flag @PROFILE_DRAG_AIRLOADS = YES, corrections to account for profile drag loads will be added to the airloads. (Default value: @PROFILE_DRAG_AIRLOADS = YES).
  3. Parameter RfModl selects the reverse flow model; three choices are possible: RfModl = NONE, HARD, or SOFT. These three choices are explained in section 3.3.1, Kutta condition and reverse flow parameter.
  4. If flag @ONERA_DYNAMIC_STALL = YES, the ONERA dynamic stall model will be used. For this option to take effect, several conditions must be met: 1) an ONERA dynamic stall model must be defined, 2) this model must be associated with an airtable, and 3) this airtable must appear in the lifting line properties associated with the lifting line pertinent to this aerodynamic loads interface. (Default value: @ONERA_DYNAMIC_STALL = NO).

Leishman-Beddoes unsteady aerodynamics model

The following data can be specified when using the Leishman-Beddoes unsteady aerodynamics model.

  1. If flag @SEPARATED_FLOW_MODEL = YES, the separated flow option of the Leishman-Beddoes model is used. (Default value: @SEPARATED_FLOW_MODEL = NO).
  2. If flag @PROFILE_DRAG_AIRLOADS = YES, corrections to account for profile drag loads will be added to the airloads. (Default value: @PROFILE_DRAG_AIRLOADS = YES).
  3. If flag @DYNAMIC_STALL_MODEL = YES, the dynamic stall option included in the Leishman-Beddoes model is used. (Default value: @DYNAMIC_STALL_MODEL = NO).
  4. If flag @ONERA_DYNAMIC_STALL = YES, the ONERA dynamic stall model will be used. For this option to take effect, several conditions must be met: 1) an ONERA dynamic stall model must be defined, 2) this model must be associated with an airtable, and 3) this airtable must appear in the lifting line properties associated with the lifting line pertinent to this aerodynamic loads interface. (Default value: @ONERA_DYNAMIC_STALL = NO). Note that one only of the two dynamic stall models can be used at the same time.

Morrison unsteady hydrodynamics model

The following data can be specified when using the Morrison unsteady hydrodynamics model.

  1. If flag @QUASI_STEADY = YES, the quasi-steady version of Peters model is used, i.e., unsteady aerodynamic terms are ignored. (Default value: @QUASI_STEADY = NO).
  2. If flag @PROFILE_DRAG_AIRLOADS = YES, corrections to account for profile drag loads will be added to the airloads. (Default value: @PROFILE_DRAG_AIRLOADS = YES).