Release Notes OpenFAST v3.4.0 includes several major new features and bug fixes. New features include a new curled-wake model in FAST.Farm (#931), buoyancy calculations in AeroDyn 15 for MHK turbines (#957), rotor and tail furling (#1277), and new library interfaces for AeroDyn 15 and MoorDyn to couple with other codes (#1110 & #848). One major bug fix is changing the CFD coupling to use only the AeroDyn 15 mesh information -- this had led to some discrepancies in CFD results (#1324). The full set of changes included in this version are further documented in the following listed pull requests. General 889 Add a super-controller library target to CMake 1303 Small reorganization and clean up FAST.Farm r-test input files, upload of artifact 1311 NWTC_IO: nullifying DLL (on restart) if not present when packing 1318 Allow Registry to generate extrap/interp routines for types without module nickname 1327 add version info to c-binding libraries 1332 Documentation fixes 1357 CI: exclude bokeh 3.0.[0-3] -- broken plots 1376 Add regression_tests to the ALL target. Documentation 1267 OLAF: documentation: updated guidelines and using nFWPanels instead of WakeLength 1406 Update example InflowWind and FAST.Farm input files Visualization 1319 Cleanup OpenFAST VTK output for HydroDyn 1321 Add safety checks to VTK output 1330 VTKLin: being more forgiving with number of modes 1333 NWTC_Lib: Adding Yaml and VTK to library (moved from SD and AD) FAST.Farm 931 Implementation of the curled-wake model in FAST.Farm 1263 FAST.Farm WriteOutput: fix for Windows Intel OMP build 1304 API changes for future curl wake implementation, WD restructuring (Cq, OMP, skew filt) 1305 FF: Cartesian grid for AWAE and WD outputs 1310 FF: additional OpenMP parallelizations in FAST.Farm 1328 FF: update of guidelines for Curled wake dr and DT_low OpenFAST 1275 Linear Trim Solution Improvements (Linearization) AeroDyn 957 Calculate buoyancy for an MHK turbine 1110 New AeroDynInflow module with c-bindings interface 1276 Bug Fix: OLAF: particles are NaN when vortex segments have zero length 1277 Reactivating rotor furling and tailfin aerodynamics (ElastoDyn also) 1283 Add new projection method and BEM methods 1293 Minor error handling and code cleanup (OLAF) 1317 Fix for Visual Studio builds with ADI 1347 AeroDyn/UnsteadyAero_Driver: Fix for bug #1346 1355 OLAF: Adding free near wake panels 1356 AeroDyn/UnsteadyAero_Driver: Fix for bug #1346 1369 UA: adding UA_Driver outputs, fix separation function for UAMod=6, and adding r-tests BeamDyn 1335 BeamDyn: output summary file in yaml format InflowWind 1240 Improvements to the InflowWind disk averaged velocity calculations 1266 Temporarily removing InflowWind parallelization MoorDyn 848 MoorDyn v2 C-bindings interface 1371 MoorDyn bending bugfix and message updates for v2 OpenFOAM 1324 CFD coupling to use AD15 mesh only 1365 OpFM: [bugfix] test for warning condition was broken 1372 [BugFix] the DEBUG_OPENFOAM preprocessor directive was never updated for multiple AD15 rotors TurbSim 1361 TurbSim: User-defined time series updates