# Problems including a MoorDyn file in my Fast model **URL:** \ **Category:** Computer-Aided Engineering Software Tools\ **Created:** [April 13, 2023, 11:28am UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802 "2023-04-13T11:28:36Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Pere.Palacin](https://avatars.discourse-cdn.com/v4/letter/p/b5a626/32.png) [@Pere.Palacin](https://forums.nlr.gov/u/Pere.Palacin)\ **Post date:** [April 13, 2023, 11:28am UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802/1 "2023-04-13T11:28:36Z")
Greetings, I’m trying to include a mooring system based on a single vertical cable on my OpenFAST model, through a MoorDyn input file. Currently my MoorDyn file looks like this: (WtrDepth is 200 and the lowest point of mmy strcutre is set at -100, 0, -15) ```auto --------------------- MoorDyn Input File ------------------------------------ Mooring system for MIT/NREL TLP True Echo - Echo the input to ".MD.ech"? (flag) ----------------------- LINE TYPES ------------------------------------------ Name Diam MassDen EA BA/-zeta EI Cd Ca CdAx CaAx (-) (m) (kg/m) (N) (N-s/-) (-) (-) (-) (-) (-) main 1 116.027 9.99E19 659733900000 0.0 1.6 1.0 0.1 0.0 ---------------------- POINTS -------------------------------- ID Attachment X Y Z M V CdA CA (-) (-) (m) (m) (m) (kg) (m^3) (m^2) (-) 1 fixed -100.0 0 -200.0 0 0 0 0 2 vessel -100.0 0.0 -15 0 0 0 0 ---------------------- LINES -------------------------------------- ID LineType AttachA AttachB UnstrLen NumSegs Outputs (-) (-) (-) (-) (m) (-) (-) 1 main 1 2 185 10 - ---------------------- SOLVER OPTIONS --------------------------------------- 0.001 dtM - time step to use in mooring integration (s) 3.0e4 kbot - bottom stiffness (Pa/m) 3.0e4 cbot - bottom damping (Pa-s/m) 2.0 dtIC - time interval for analyzing convergence during IC gen (s) 60.0 TmaxIC - max time for ic gen (s) 4.0 CdScaleIC - factor by which to scale drag coefficients during dynamic relaxation (-) 0.01 threshIC - threshold for IC convergence (-) ------------------------ OUTPUTS -------------------------------------------- FairTen1 AnchTen1 END ------------------------- need this line -------------------------------------- ``` I’m getting this erro upon compiling: ```auto Running MoorDyn (v2.a27, 2022-07-20). This is an alpha version of MoorDyn-F v2, with significant input file changes from v1. Copyright: (C) 2021 National Renewable Energy Laboratory, (C) 2019 Matt Hall Parsing MoorDyn input file: .\IEA-15-240-RWT-Monopile_MoorDyn.dat Created mooring system: 1 lines, 2 points, 0 rods, 0 bodies. Finalizing initial conditions using dynamic relaxation. Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 Warning: extreme pitch moment from body-attached Point 1 NaN detected at time 4.000000000000000E-003 in Line 1 in MoorDyn . NaN detected at time 4.500000000000001E-003 in Line 1 in MoorDyn . t=5.00000E-03 FairTen 1: NaN, 1, 2 NaN detected at time 5.000000000000000E-003 in Line 1 in MoorDyn . NaN detected at time 5.500000000000000E-003 in Line 1 in MoorDyn . t=6.00000E-03 FairTen 1: NaN, NaN, 1 NaN detected at time 6.000000000000000E-003 in Line 1 in MoorDyn . NaN detected at time 6.500000000000001E-003 in Line 1 in MoorDyn . t=7.00000E-03 FairTen 1: NaN, NaN, NaN NaN detected at time 7.000000000000000E-003 in Line 1 in MoorDyn . NaN detected at time 7.500000000000000E-003 in Line 1 in MoorDyn . t=8.00000E-03 FairTen 1: NaN, NaN, NaN NaN detected at time 8.000000000000000E-003 in Line 1 in MoorDyn . NaN detected at time 8.500000000000001E-003 in Line 1 in MoorDyn . t=9.00000E-03 FairTen 1: NaN, NaN, NaN NaN detected at time 9.000000000000001E-003 in Line 1 in MoorDyn . NaN detected at time 9.500000000000001E-003 in Line 1 in MoorDyn . t=1.00000E-02 FairTen 1: NaN, NaN, NaN NaN detected at time 1.000000000000000E-002 in Line 1 in MoorDyn . NaN detected at time 1.050000000000000E-002 in Line 1 in MoorDyn . t=1.10000E-02 FairTen 1: NaN, NaN, NaN NaN detected at time 1.100000000000000E-002 in Line 1 in MoorDyn . NaN detected at time 1.150000000000000E-002 in Line 1 in MoorDyn . t=1.20000E-02 FairTen 1: NaN, NaN, NaN NaN detected at time 1.200000000000000E-002 in Line 1 in MoorDyn . NaN detected at time 1.250000000000000E-002 in Line 1 in MoorDyn . t=1.30000E-02 FairTen 1: NaN, NaN, NaN NaN detected at time 1.300000000000000E-002 in Line 1 in MoorDyn . NaN detected at time 1.350000000000001E-002 in Line 1 in MoorDyn . t=1.40000E-02 FairTen 1: NaN, NaN, NaN Fairlead tensions converged to 1% after 1.40000E-02 seconds. MoorDyn initialization completed. FAST_InitializeAll:FAST_Init:FAST_ReadPrimaryFile:1/VTK_fps is not an integer multiple of DT. FAST will output VTK information at 15.385 fps, the closest rate possible. FAST_InitializeAll: NaN state detected. OpenFAST encountered an error during module initialization. Simulation error level: FATAL ERROR ``` I think that the error is not due to my MoorDyn file but rather something related to the rest of my model. I am not able to find out what exactly. Eventhough I have Echo enabled, I don’t get any .ech file from MoorDyn… What could cause this error? Thanks! ---
**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\ **Post date:** [April 13, 2023, 4:43pm UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802/2 "2023-04-13T16:43:04Z")
Dear @Pere.Palacin, My guess is the big problem is that your EA stiffness is unrealistically high (10^19 N) causing problems in the numerical solve. Best regards, ---
**Author:** ![Pere.Palacin](https://avatars.discourse-cdn.com/v4/letter/p/b5a626/32.png) [@Pere.Palacin](https://forums.nlr.gov/u/Pere.Palacin)\ **Post date:** [April 13, 2023, 7:31pm UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802/3 "2023-04-13T19:31:58Z")
Dear @Jason.Jonkman , Thanks a lot for your reply. That fixed the error indeed. I was having problems with the default value so I kept on increasing it as I thought that was the problem. Currently I am facing a new problem as I get this error upon compiling: ```auto FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption1:FullOpt1_InputOutputSolve:HydroDyn_CalcO utput:Morison_CalcOutput:The upper end-plate of a member must not cross the water plane. This is not true for Member ID 2 Morison_CalcOutput:The lowest element of a Morison member has become partially submerged! This is not allowed. Please review your model and create a discretization such that even with displacements, the lowest element of a member does not become partially submerged. HydroDyn_CalcOutput:Morison_CalcOutput:The upper end-plate of a member must not cross the water plane. This is not true for Member ID 2 Morison_CalcOutput:The lowest element of a Morison member has become partially submerged! This is not allowed. Please review your model and create a discretization such that even with displacements, the lowest element of a member does not become partially submerged. OpenFAST encountered an error at simulation time 1.85 of 30 seconds. Simulation error level: FATAL ERROR ``` The VTK visualization reveals that the platform is sinking. Which means that I must fix it’s buoyancy. How can I tweak the buoyancy of the Platform? I don’t see any way to fix it in my HydroDyn file other than increase the volume of water displaced by the floater… Please find attached a sample of my HydroDyn file. Thanks ```auto ------- HydroDyn v2.03.* Input File -------------------------------------------- IEA 15 MW offshore reference model monopile configuration False Echo - Echo the input file data (flag) ---------------------- ENVIRONMENTAL CONDITIONS -------------------------------- "default" WtrDens - Water density (kg/m^3) "default" WtrDpth - Water depth (meters) "default" MSL2SWL - Offset between still-water level and mean sea level (meters) [positive upward; unused when WaveMod = 6; must be zero if PotMod=1 or 2] ---------------------- WAVES --------------------------------------------------- 0 WaveMod - Incident wave kinematics model {0: none=still water, 1: regular (periodic), 1P#: regular with user-specified phase, 2: JONSWAP/Pierson-Moskowitz spectrum (irregular), 3: White noise spectrum (irregular), 4: user-defined spectrum from routine UserWaveSpctrm (irregular), 5: Externally generated wave-elevation time series, 6: Externally generated full wave-kinematics time series [option 6 is invalid for PotMod/=0]} (switch) 0 WaveStMod - Model for stretching incident wave kinematics to instantaneous free surface {0: none=no stretching, 1: vertical stretching, 2: extrapolation stretching, 3: Wheeler stretching} (switch) [unused when WaveMod=0 or when PotMod/=0] 3630 WaveTMax - Analysis time for incident wave calculations (sec) [unused when WaveMod=0; determines WaveDOmega=2Pi/WaveTMax in the IFFT] 0.25 WaveDT - Time step for incident wave calculations (sec) [unused when WaveMod=0; 0.1<=WaveDT<=1.0 recommended; determines WaveOmegaMax=Pi/WaveDT in the IFFT] 4.52 WaveHs - Significant wave height of incident waves (meters) [used only when WaveMod=1, 2, or 3] 9.45 WaveTp - Peak-spectral period of incident waves (sec) [used only when WaveMod=1 or 2] "DEFAULT" WavePkShp - Peak-shape parameter of incident wave spectrum (-) or DEFAULT (string) [used only when WaveMod=2; use 1.0 for Pierson-Moskowitz] 0.15708 WvLowCOff - Low cut-off frequency or lower frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6] 3.2 WvHiCOff - High cut-off frequency or upper frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6] 0 WaveDir - Incident wave propagation heading direction (degrees) [unused when WaveMod=0 or 6] 0 WaveDirMod - Directional spreading function {0: none, 1: COS2S} (-) [only used when WaveMod=2,3, or 4] 1 WaveDirSpread - Wave direction spreading coefficient ( > 0 ) (-) [only used when WaveMod=2,3, or 4 and WaveDirMod=1] 1 WaveNDir - Number of wave directions (-) [only used when WaveMod=2,3, or 4 and WaveDirMod=1; odd number only] 90 WaveDirRange - Range of wave directions (full range: WaveDir +/- 1/2*WaveDirRange) (degrees) [only used when WaveMod=2,3,or 4 and WaveDirMod=1] 123456789 WaveSeed(1) - First random seed of incident waves [-2147483648 to 2147483647] (-) [unused when WaveMod=0, 5, or 6] RANLUX WaveSeed(2) - Second random seed of incident waves [-2147483648 to 2147483647] (-) [unused when WaveMod=0, 5, or 6] TRUE WaveNDAmp - Flag for normally distributed amplitudes (flag) [only used when WaveMod=2, 3, or 4] "" WvKinFile - Root name of externally generated wave data file(s) (quoted string) [used only when WaveMod=5 or 6] 1 NWaveElev - Number of points where the incident wave elevations can be computed (-) [maximum of 9 output locations] 0 WaveElevxi - List of xi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0] 0 WaveElevyi - List of yi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0] ---------------------- 2ND-ORDER WAVES ----------------------------------------- [unused with WaveMod=0 or 6] False WvDiffQTF - Full difference-frequency 2nd-order wave kinematics (flag) False WvSumQTF - Full summation-frequency 2nd-order wave kinematics (flag) 0 WvLowCOffD - Low frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method] 3.04292 WvHiCOffD - High frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method] 0.314159 WvLowCOffS - Low frequency cutoff used in the summation-frequencies (rad/s) [Only used with a summation-frequency method] 3.2 WvHiCOffS - High frequency cutoff used in the summation-frequencies (rad/s) [Only used with a summation-frequency method] ---------------------- CURRENT ------------------------------------------------- [unused with WaveMod=6] 1 CurrMod - Current profile model {0: none=no current, 1: standard, 2: user-defined from routine UserCurrent} (switch) 2 CurrSSV0 - Sub-surface current velocity at still water level (m/s) [used only when CurrMod=1] 90 CurrSSDir - Sub-surface current heading direction (degrees) or DEFAULT (string) [used only when CurrMod=1] 5 CurrNSRef - Near-surface current reference depth (meters) [used only when CurrMod=1] 2 CurrNSV0 - Near-surface current velocity at still water level (m/s) [used only when CurrMod=1] 90 CurrNSDir - Near-surface current heading direction (degrees) [used only when CurrMod=1] 2 CurrDIV - Depth-independent current velocity (m/s) [used only when CurrMod=1] 90 CurrDIDir - Depth-independent current heading direction (degrees) [used only when CurrMod=1] ---------------------- FLOATING PLATFORM --------------------------------------- [unused with WaveMod=6] 0 PotMod - Potential-flow model {0: none=no potential flow, 1: frequency-to-time-domain transforms based on WAMIT output, 2: fluid-impulse theory (FIT)} (switch) 0 ExctnMod - Wave Excitation model {0: None, 1: DFT, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ssexctn INPUT FILE] 0 RdtnMod - Radiation memory-effect model {0: no memory-effect calculation, 1: convolution, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ss INPUT FILE] 60.0 RdtnTMax - Analysis time for wave radiation kernel calculations (sec) [only used when PotMod=1; determines RdtnDOmega=Pi/RdtnTMax in the cosine transform; MAKE SURE THIS IS LONG ENOUGH FOR THE RADIATION IMPULSE RESPONSE FUNCTIONS TO DECAY TO NEAR-ZERO FOR THE GIVEN PLATFORM!] 0 RdtnDT - Time step for wave radiation kernel calculations (sec) [only used when PotMod=1; DT<=RdtnDT<=0.1 recommended; determines RdtnOmegaMax=Pi/RdtnDT in the cosine transform] 1 NBody - Number of WAMIT bodies to be used (-) [>=1; only used when PotMod=1. If NBodyMod=1, the WAMIT data contains a vector of size 6*NBody x 1 and matrices of size 6*NBody x 6*NBody; if NBodyMod>1, there are NBody sets of WAMIT data each with a vector of size 6 x 1 and matrices of size 6 x 6] 1 NBodyMod - Body coupling model {1: include coupling terms between each body and NBody in HydroDyn equals NBODY in WAMIT, 2: neglect coupling terms between each body and NBODY=1 with XBODY=0 in WAMIT, 3: Neglect coupling terms between each body and NBODY=1 with XBODY=/0 in WAMIT} (switch) [only used when PotMod=1] "unused" PotFile - Root name of potential-flow model data; WAMIT output files containing the linear, nondimensionalized, hydrostatic restoring matrix (.hst), frequency-dependent hydrodynamic added mass matrix and damping matrix (.1), and frequency- and direction-dependent wave excitation force vector per unit wave amplitude (.3) (quoted string) [MAKE SURE THE FREQUENCIES INHERENT IN THESE WAMIT FILES SPAN THE PHYSICALLY-SIGNIFICANT RANGE OF FREQUENCIES FOR THE GIVEN PLATFORM; THEY MUST CONTAIN THE ZERO- AND INFINITE-FREQUENCY LIMITS!] 1 WAMITULEN - Characteristic body length scale used to redimensionalize WAMIT output (meters) [only used when PotMod=1] 0.0 PtfmRefxt - The xt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1] 0.0 PtfmRefyt - The yt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1] 0.0 PtfmRefzt - The zt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1. If NBodyMod=2,PtfmRefzt=0.0] 0.0 PtfmRefztRot - The rotation about zt of the body reference frame(s) from xt/yt (degrees) [1 to NBody] [only used when PotMod=1] 0.0 PtfmVol0 - Displaced volume of water when the platform is in its undisplaced position (m^3) [only used when PotMod=1; USE THE SAME VALUE COMPUTED BY WAMIT AS OUTPUT IN THE .OUT FILE!] 0.0 PtfmCOBxt - The xt offset of the center of buoyancy (COB) from the platform reference point (meters) [only used when PotMod=1] 0.0 PtfmCOByt - The yt offset of the center of buoyancy (COB) from the platform reference point (meters) [only used when PotMod=1] ---------------------- 2ND-ORDER FLOATING PLATFORM FORCES ---------------------- [unused with WaveMod=0 or 6, or PotMod=0 or 2] 0 MnDrift - Mean-drift 2nd-order forces computed {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero] 0 NewmanApp - Mean- and slow-drift 2nd-order forces computed with Newman's approximation {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero. Used only when WaveDirMod=0] 0 DiffQTF - Full difference-frequency 2nd-order forces computed with full QTF {0: None; [10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero] 0 SumQTF - Full summation -frequency 2nd-order forces computed with full QTF {0: None; [10, 11, or 12]: WAMIT file to use} ---------------------- PLATFORM ADDITIONAL STIFFNESS AND DAMPING -------------- 0.0 AddF0 - Additional preload (N, N-m) [If NBodyMod=1, one size 6*NBody x 1 vector; if NBodyMod>1, NBody size 6 x 1 vectors] 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0 AddCLin - Additional linear stiffness (N/m, N/rad, N-m/m, N-m/rad) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 AddBLin - Additional linear damping(N/(m/s), N/(rad/s), N-m/(m/s), N-m/(rad/s)) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 AddBQuad - Additional quadratic drag(N/(m/s)^2, N/(rad/s)^2, N-m(m/s)^2, N-m/(rad/s)^2) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ---------------------- AXIAL COEFFICIENTS -------------------------------------- 1 NAxCoef - Number of axial coefficients (-) AxCoefID AxCd AxCa AxCp (-) (-) (-) (-) 1 0.00 0.00 1.00 ---------------------- MEMBER JOINTS ------------------------------------------- 27 NJoints - Number of joints (-) [must be exactly 0 or at least 2] JointID Jointxi Jointyi Jointzi JointAxID JointOvrlp [JointOvrlp= 0: do nothing at joint, 1: eliminate overlaps by calculating super member] (-) (m) (m) (m) (-) (switch) 1 XYZ 1 0 2 XYZ 1 0 3 XYZ 1 0 4 XYZ 1 0 5 XYZ 1 0 6 XYZ 1 0 7 XYZ 1 0 8 XYZ 1 0 9 XYZ 1 0 10 XYZ 1 0 11 XYZ 1 0 12 XYZ 1 0 13 XYZ 1 0 14 XYZ 1 0 15 XYZ 1 0 16 XYZ 1 0 17 XYZ 1 0 18 XYZ 1 0 19 XYZ 1 0 20 XYZ 1 0 21 XYZ 1 0 22 XYZ 1 0 23 XYZ 1 0 24 XYZ 1 0 25 XYZ 1 0 26 XYZ 1 0 27 XYZ 1 0 ---------------------- MEMBER CROSS-SECTION PROPERTIES ------------------------- 7 NPropSets - Number of member property sets (-) PropSetID PropD PropThck (-) (m) (m) 1 D1 T1 2 D2 T2 3 D3 T3 4 D4 T4 5 D5 T5 6 D6 T6 7 D7 T7 ---------------------- SIMPLE HYDRODYNAMIC COEFFICIENTS (model 1) -------------- SimplCd SimplCdMG SimplCa SimplCaMG SimplCp SimplCpMG SimplAxCd SimplAxCdMG SimplAxCa SimplAxCaMG SimplAxCp SimplAxCpMG (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) 1.0 1.0 1.0 1.0 1.0 1.0 0.0 0.0 1.0 1.0 1.0 1.0 ---------------------- DEPTH-BASED HYDRODYNAMIC COEFFICIENTS (model 2) --------- 0 NCoefDpth - Number of depth-dependent coefficients (-) Dpth DpthCd DpthCdMG DpthCa DpthCaMG DpthCp DpthCpMG DpthAxCd DpthAxCdMG DpthAxCa DpthAxCaMG DpthAxCp DpthAxCpMG (m) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) ---------------------- MEMBER-BASED HYDRODYNAMIC COEFFICIENTS (model 3) -------- 0 NCoefMembers - Number of member-based coefficients (-) MemberID_HydC MemberCd1 MemberCd2 MemberCdMG1 MemberCdMG2 MemberCa1 MemberCa2 MemberCaMG1 MemberCaMG2 MemberCp1 MemberCp2 MemberCpMG1 MemberCpMG2 MemberAxCd1 MemberAxCd2 MemberAxCdMG1 MemberAxCdMG2 MemberAxCa1 MemberAxCa2 MemberAxCaMG1 MemberAxCaMG2 MemberAxCp1 MemberAxCp2 MemberAxCpMG1 MemberAxCpMG2 (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) -------------------- MEMBERS ------------------------------------------------- 44 NMembers - Number of members (-) MemberID MJointID1 MJointID2 MPropSetID1 MPropSetID2 MDivSize MCoefMod PropPot [MCoefMod=1: use simple coeff table, 2: use depth-based coeff table, 3: use member-based coeff table] [PropPot/=0 if member is modeled with potential-flow theory] (-) (-) (-) (-) (-) (m) (switch) (flag) 1 AB 1 1 1.0000 1 FALSE 2 AB 1 1 1.0000 1 FALSE 3 AB 1 1 1.0000 1 FALSE 4 AB 1 1 1.0000 1 FALSE 5 AB 2 2 1.0000 1 FALSE 6 AB 2 3 1.0000 1 FALSE 7 AB 3 3 1.0000 1 FALSE 8 AB 3 3 1.0000 1 FALSE 9 AB 3 3 1.0000 1 FALSE 10 AB 2 2 1.0000 1 FALSE 11 AB 2 3 1.0000 1 FALSE 12 AB 3 3 1.0000 1 FALSE 13 AB 3 3 1.0000 1 FALSE 14 AB 3 3 1.0000 1 FALSE 15 AB 4 4 1.0000 1 FALSE 16 AB 4 4 1.0000 1 FALSE 17 AB 4 4 1.0000 1 FALSE 18 AB 4 4 1.0000 1 FALSE 19 AB 4 4 1.0000 1 FALSE 20 AB 5 5 1.0000 1 FALSE 21 AB 5 5 1.0000 1 FALSE 22 AB 5 5 1.0000 1 FALSE 23 AB 5 5 1.0000 1 FALSE 24 AB 4 4 1.0000 1 FALSE 25 AB 4 4 1.0000 1 FALSE 26 AB 4 4 1.0000 1 FALSE 27 AB 4 4 1.0000 1 FALSE 28 AB 4 4 1.0000 1 FALSE 29 AB 5 5 1.0000 1 FALSE 30 AB 5 5 1.0000 1 FALSE 31 AB 5 5 1.0000 1 FALSE 32 AB 5 5 1.0000 1 FALSE 33 AB 4 4 1.0000 1 FALSE 34 AB 4 4 1.0000 1 FALSE 35 AB 4 4 1.0000 1 FALSE 36 AB 4 4 1.0000 1 FALSE 37 AB 4 4 1.0000 1 FALSE 38 AB 5 5 1.0000 1 FALSE 39 AB 5 5 1.0000 1 FALSE 40 AB 5 5 1.0000 1 FALSE 41 AB 5 5 1.0000 1 FALSE 42 AB 6 6 1.0000 1 FALSE 43 AB 6 6 1.0000 1 FALSE 44 AB 7 7 1.0000 1 FALSE ---------------------- FILLED MEMBERS ------------------------------------------ 0 NFillGroups - Number of filled member groups (-) [If FillDens = DEFAULT, then FillDens = WtrDens; FillFSLoc is related to MSL2SWL] FillNumM FillMList FillFSLoc FillDens (-) (-) (m) (kg/m^3) ---------------------- MARINE GROWTH ------------------------------------------- 0 NMGDepths - Number of marine-growth depths specified (-) MGDpth MGThck MGDens (m) (m) (kg/m^3) ---------------------- MEMBER OUTPUT LIST -------------------------------------- 0 NMOutputs - Number of member outputs (-) [must be < 10] MemberID NOutLoc NodeLocs [NOutLoc < 10; node locations are normalized distance from the start of the member, and must be >=0 and <= 1] [unused if NMOutputs=0] (-) (-) (-) ---------------------- JOINT OUTPUT LIST --------------------------------------- 2 NJOutputs - Number of joint outputs [Must be < 10] 1,2 JOutLst - List of JointIDs which are to be output (-)[unused if NJOutputs=0] ---------------------- OUTPUT -------------------------------------------------- True HDSum - Output a summary file [flag] False OutAll - Output all user-specified member and joint loads (only at each member end, not interior locations) [flag] 2 OutSwtch - Output requested channels to: [1=Hydrodyn.out, 2=GlueCode.out, 3=both files] "ES11.4e2" OutFmt - Output format for numerical results (quoted string) [not checked for validity!] "A11" OutSFmt - Output format for header strings (quoted string) [not checked for validity!] ---------------------- OUTPUT CHANNELS ----------------------------------------- "Wave1Elev" - Wave elevation at the WAMIT reference point (0,0) END of output channels and end of file. (the word "END" must appear in the first 3 columns of this line) ``` ---
**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\ **Post date:** [April 13, 2023, 8:48pm UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802/4 "2023-04-13T20:48:17Z")
Dear @Pere.Palacin, Is your model set up following the recommended practice ([4.2.8.4. Modeling Considerations — OpenFAST v3.4.1 documentation](https://openfast.readthedocs.io/en/main/source/user/hydrodyn/modeling_considerations.html#undisplaced-position-for-floating-systems)) such that the system weight balances with the undisplaced buoyancy and vertical pretension of the mooring system? I also see that you’ve set a pretty strong combination of current profiles; could that be part of the problem? Best regards, ---
**Author:** ![Pere.Palacin](https://avatars.discourse-cdn.com/v4/letter/p/b5a626/32.png) [@Pere.Palacin](https://forums.nlr.gov/u/Pere.Palacin)\ **Post date:** [April 13, 2023, 9:07pm UTC](https://forums.nlr.gov/t/problems-including-a-moordyn-file-in-my-fast-model/4802/5 "2023-04-13T21:07:13Z")
Dear @Jason.Jonkman , Thanks a lot for your reply. I didn’t know about the recommended practices to set up my HydroDyn file. I will review it throughly to try to solve the issue. I was testing different current speeds as part of my study but I get the same issue with different speeds and the error persisted. I will try to fix it on my own following the guidelines provided. If I encounter any problem I will ask again. Thanks a lot, Best regards. Pere