Version 4.0.2
I try to use TLCD in NREL_5MW+OC4 float wind turbine, but i face several problems
The outside condition is free damper: [8deg PtfmPitch]
- i try to install a X_TLCD to the NumNStC, and this is what i write in the TLCD.dat
---------------------- StC LOCATION ------------------------------------------- [relative to the reference origin of component attached to]
0 StC_P_X - At rest X position of StC (m)
0 StC_P_Y - At rest Y position of StC (m)
0 StC_P_Z - At rest Z position of StC (m)
…
---------------------- TLCD --------------------------------------------------- [used only when StC_DOF_MODE=3]
18.8200 L_X - X TLCD total length (m)
16.0000 B_X - X TLCD horizontal length (m)
3.6600 area_X - X TLCD cross-sectional area of vertical column (m^2)
4.4103 area_ratio_X - X TLCD cross-sectional area ratio (vertical column area divided by horizontal column area) (-)
17.0000 headLossCoeff_X - X TLCD head loss coeff (-)
1025 rho_X - X TLCD liquid density (kg/m^3)
0.0000 L_Y - Y TLCD total length (m)
0.0000 B_Y - Y TLCD horizontal length (m)
0.0000 area_Y - Y TLCD cross-sectional area of vertical column (m^2)
0.0000 area_ratio_Y - Y TLCD cross-sectional area ratio (vertical column area divided by horizontal column area) (-)
0.0000 headLossCoeff_Y - Y TLCD head loss coeff (-)
1025 rho_Y - Y TLCD liquid density (kg/m^3)
But this give me an error like this:
The BEM solution is being turned off due to low TSR. (TSR = 0). This warning will not be
repeated though the condition may persist. (See GeomPhi output channel.)
NaN detected at time 1.00000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.00000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.00000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.00000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.00000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.00000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.05000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.05000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.05000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.10000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.10000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.10000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.15000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.15000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.15000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.20000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.20000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.20000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.25000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.25000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.25000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.30000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.30000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.30000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.35000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.35000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.35000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.40000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.40000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.40000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.45000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.45000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.45000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.50000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.50000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.50000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.55000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.55000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.55000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.60000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.60000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.60000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.65000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.65000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.65000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.70000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.70000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.70000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.75000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.75000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.75000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.80000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.80000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.80000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.85000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.85000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.85000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.90000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.90000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.90000E-02 in Line 3 in MoorDyn.
NaN detected at time 1.95000E-02 in Line 1 in MoorDyn.
NaN detected at time 1.95000E-02 in Line 2 in MoorDyn.
NaN detected at time 1.95000E-02 in Line 3 in MoorDyn.
FAST_Solution:FAST_UpdateStates:FAST_AdvanceStates: NaN state detected.
MD_UpdateStates: NaN state detected.
OpenFAST encountered an error at simulation time 2.00000E-02 of 1200 seconds.
Simulation error level: FATAL ERROR
Aborting OpenFAST.
2. How to balance the add-mass by reduce the water?
I try to keep the average of PtfmHeave alomst the same to the origin data, so i try to calculate the mass of the TLCD by the following function:
the origin water level: -6.17m
the water filled = -6.17 - [L-B+(B/area_ratio)](area_X)/(3PI*(6-0.06)^2)
And if the TLCD is the same in X and Y direction then i think that the water filled is
-6.17 - 2*[L-B+(B/area_ratio)](area_X)/(3PI*(6-0.06)^2)
In another example of A TLCD installed to NumSStC
---------------------- StC LOCATION ------------------------------------------- [relative to the reference origin of component attached to]
0 StC_P_X - At rest X position of StC (m)
0 StC_P_Y - At rest Y position of StC (m)
-19 StC_P_Z - At rest Z position of StC (m)
…
---------------------- TLCD --------------------------------------------------- [used only when StC_DOF_MODE=3]
14.5000 L_X - X TLCD total length (m)
5.5000 B_X - X TLCD horizontal length (m)
0.7854 area_X - X TLCD cross-sectional area of vertical column (m^2)
8.7971 area_ratio_X - X TLCD cross-sectional area ratio (vertical column area divided by horizontal column area) (-)
2.0000 headLossCoeff_X - X TLCD head loss coeff (-)
1025 rho_X - X TLCD liquid density (kg/m^3)
14.5000 L_Y - Y TLCD total length (m)
5.5000 B_Y - Y TLCD horizontal length (m)
0.7854 area_Y - Y TLCD cross-sectional area of vertical column (m^2)
8.7971 area_ratio_Y - Y TLCD cross-sectional area ratio (vertical column area divided by horizontal column area) (-)
2.0000 headLossCoeff_Y - Y TLCD head loss coeff (-)
1025 rho_Y - Y TLCD liquid density (kg/m^3)
By the function, i get the water filled= -6.215465908
But The .outb result of PtfmHeave was different from what I had expected.
This is the two main problems i reached in the test, beside this, Are there any suggestion or good TLCD configuration parameters that can be used to suppress PtfmPitch? The effects of the several TLCDs I tested were not satisfactory.