--------------------------- OLAF (cOnvecting LAgrangian Filaments) INPUT FILE -----------------
Free wake input file for the Helix test case
--------------------------- GENERAL OPTIONS ---------------------------------------------------
default IntMethod          - Integration method {1: Runge-Kutta 4th order, 5: Forward Euler 1st order, default: 5} (switch)
0.2     DTfvw              - Time interval for wake propagation. {default: dtaero} (s)
default FreeWakeStart      - Time when wake is free. (-) value = always free. {default: 0.0} (s)
default FullCircStart      - Time at which full circulation is reached. {default: 0.0} (s)
--------------------------- CIRCULATION SPECIFICATIONS ----------------------------------------
default CircSolvMethod     - Circulation solving method {1: Cl-Based, 2: No-Flow Through, 3: Prescribed, default: 1 }(switch)
default CircSolvConvCrit   - Convergence criteria {default: 0.001} [only if CircSolvMethod=1] (-)
default CircSolvRelaxation - Relaxation factor {default: 0.1} [only if CircSolvMethod=1] (-)
default CircSolvMaxIter    - Maximum number of iterations for circulation solving {default: 30} (-)
"NA"    PrescribedCircFile - File containing prescribed circulation [only if CircSolvMethod=3] (quoted string)
===============================================================================================
--------------------------- WAKE OPTIONS ------------------------------------------------------
------------------- WAKE EXTENT AND DISCRETIZATION --------------------------------------------
150     nNWPanels          - Number of near-wake panels (-)
default nNWPanelsFree      - Number of free near-wake panels (-) {default: nNWPanels}
default nFWPanels          - Number of far-wake panels (-) {default: 0}
default nFWPanelsFree      - Number of free far-wake panels (-) {default: nNWPanels}
default FWShedVorticity    - Include shed vorticity in the far wake {default: false}
------------------- WAKE REGULARIZATIONS AND DIFFUSION -----------------------------------------
default DiffusionMethod    - Diffusion method to account for viscous effects {0: None, 1: Core Spreading, "default": 0}         
2       RegDeterMethod     - Method to determine the regularization parameters {0: Constant, 1: Optimized, 2: Chord-scaled, 3: dr-scaled, default: 0 }          
default RegFunction        - Viscous diffusion function {0: None, 1: Rankine, 2: LambOseen, 3: Vatistas, 4: Denominator, "default": 3} (switch)
default WakeRegMethod      - Wake regularization method {1: Constant, 2: Stretching, 3: Age, default: 1} (switch)
0.25    WakeRegFactor      - Wake regularization factor (m or -)
0.25    WingRegFactor      - Wing regularization factor (m or -)
1000    CoreSpreadEddyVisc - Eddy viscosity in core spreading methods, typical values 1-1000 
------------------- WAKE TREATMENT OPTIONS ---------------------------------------------------
default TwrShadowOnWake    - Include tower flow disturbance effects on wake convection {default:false} [only if TwrPotent or TwrShadow]
default ShearModel         - Shear Model {0: No treatment, 1: Mirrored vorticity, default: 0}
------------------- SPEEDUP OPTIONS -----------------------------------------------------------
default VelocityMethod     - Method to determine the velocity {1:Segment N^2, 2:Particle tree, 3: Particle N^2, 4: Segment Tree, default: 2}
default TreeBranchFactor   - Branch radius fraction above which a multipole calculation is used {default: 1.5} [only if VelocityMethod=2,4]
default PartPerSegment     - Number of particles per segment [only if VelocityMethod=2,3]
===============================================================================================
--------------------------- OUTPUT OPTIONS  ---------------------------------------------------
default WrVTk              - Outputs Visualization Toolkit (VTK) (independent of .fst option) {0: NoVTK, 1: Write VTK at each time step, default: 0} (flag)
default nVTKBlades         - Number of blades for which VTK files are exported {0: No VTK per blade, n: VTK for blade 1 to n, default: 0} (-) 
default VTKCoord           - Coordinate system used for VTK export. {1: Global, 2: Hub, 3: Both, default: 1} 
default VTK_fps            - Frame rate for VTK output (frames per second) {"all" for all glue code timesteps, "default" for all OLAF timesteps} [only if WrVTK=1] 
0       nGridOut           - Number of grid outputs
GridName  GridType  TStart  TEnd     DTGrid    XStart    XEnd   nX    YStart   YEnd    nY    ZStart   ZEnd   nZ
(-)         (-)      (s)     (s)      (s)        (m)      (m)    (-)    (m)     (m)     (-)    (m)     (m)    (-)
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