4.2.2.10. Appendix A: OLAF Primary Input File¶
Check the regression test cases for updates to this input file.
1--------------------------- OLAF (cOnvecting LAgrangian Filaments) INPUT FILE -----------------
2Free wake input file for the Helix test case
3--------------------------- GENERAL OPTIONS ---------------------------------------------------
45 IntMethod Integration method {1: Runge-Kutta 4th order, 5: Forward Euler 1st order, default: 5} (switch)
50.2 DTfvw Time interval for wake propagation. {default: dtaero} (s)
6default FreeWakeStart Time when wake is free. (-) value = always free. {default: 0.0} (s)
7default FullCircStart Time at which full circulation is reached. {default: 0.0} (s)
8--------------------------- CIRCULATION SPECIFICATIONS ----------------------------------------
91 CircSolvingMethod Circulation solving method {1: Cl-Based, 2: No-Flow Through, 3: Prescribed, default: 1 }(switch)
10default CircSolvConvCrit Convergence criteria {default: 0.001} [only if CircSolvingMethod=1] (-)
11default CircSolvRelaxation Relaxation factor {default: 0.1} [only if CircSolvingMethod=1] (-)
12default CircSolvMaxIter Maximum number of iterations for circulation solving {default: 30} (-)
13 "NA" PrescribedCircFile File containing prescribed circulation [only if CircSolvingMethod=3] (quoted string)
14===============================================================================================
15--------------------------- WAKE OPTIONS ------------------------------------------------------
16------------------- WAKE EXTENT AND DISCRETIZATION --------------------------------------------
17150 nNWPanel Number of near-wake panels [integer] (-)
18400 WakeLength Total wake distance [integer] (number of time steps)
19default FreeWakeLength Wake length that is free [integer] (number of time steps) {default: WakeLength}
20False FWShedVorticity Include shed vorticity in the far wake {default: false}
21------------------- WAKE REGULARIZATIONS AND DIFFUSION -----------------------------------------
220 DiffusionMethod Diffusion method to account for viscous effects {0: None, 1: Core Spreading, "default": 0}
232 RegDeterMethod Method to determine the regularization parameters {0: Constant, 1: Optimized, 2: Chord-scaled, 3: dr-scaled, default: 0 }
242 RegFunction Viscous diffusion function {0: None, 1: Rankine, 2: LambOseen, 3: Vatistas, 4: Denominator, "default": 3} (switch)
253 WakeRegMethod Wake regularization method {1: Constant, 2: Stretching, 3: Age, default: 1} (switch)
260.25 WakeRegFactor Wake regularization factor (m or -)
270.25 BladeRegFactor Blade regularization factor (m or -)
281000 CoreSpreadEddyVisc Eddy viscosity in core spreading methods, typical values 1-1000
29------------------- WAKE TREATMENT OPTIONS ---------------------------------------------------
30False TwrShadowOnWake Include tower flow disturbance effects on wake convection {default:false} [only if TwrPotent or TwrShadow]
310 ShearModel Shear Model {0: No treatment, 1: Mirrored vorticity, default: 0}
32------------------- SPEEDUP OPTIONS -----------------------------------------------------------
332 VelocityMethod Method to determine the velocity {1:Biot-Savart Segment, 2:Particle tree, 3: Segment tree, default: 1}
341.5 TreeBranchFactor Branch radius fraction above which a multipole calculation is used {default: 2.0} [only if VelocityMethod=2]
351 PartPerSegment Number of particles per segment [only if VelocityMethod=2]
36===============================================================================================
37--------------------------- OUTPUT OPTIONS ---------------------------------------------------
381 WrVTk Outputs Visualization Toolkit (VTK) (independent of .fst option) {0: NoVTK, 1: Write VTK at each time step} (flag)
391 nVTKBlades Number of blades for which VTK files are exported {0: No VTK per blade, n: VTK for blade 1 to n} (-)
402 VTKCoord Coordinate system used for VTK export. {1: Global, 2: Hub, "default": 1}
411 VTK_fps Frame rate for VTK output (frames per second) {"all" for all glue code timesteps, "default" for all OLAF timesteps} [used only if WrVTK=1]
420 nGridOut Number of grid outputs
43GridName GridType TStart TEnd DTOut XStart XEnd nX YStart YEnd nY ZStart ZEnd nZ
44(-) (-) (s) (s) (s) (m) (m) (-) (m) (m) (-) (m) (m) (-)
45------------------------------------------------------------------------------------------------