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*VIVIL, file = path\modal\modal.dtbm

Data format:

One line with 16 values

GS BF CF SCF NMOVIV NBPTVIV CDVIV IGRVIV GOI GF GK GOC KC ALP RAF ICR

Status :

Optional

Purpose :

To assess inline VIV damage based on DNV RP 105

Details :

Parameter	Description
GS	Stress Safety Factor
BF	SN curve coefficient
CF	SN curve coefficient, bf and cf are equal to 1 to define multi slope SN curves
SCF	the stress concentration factor
NMOVIV	the number of modes to use to perform the calculations (0 by default and then automatically chosen by the code)
NBPTVIV	number of points used to discretized the lines studied
CDVIV	damping coefficient for VIV motion
IGRVIV	group number of the structure used to analyse.
GOI	In-Line VIV Onset Safety Factor
GF	Eigenfrequency Safety Factor
GK	Stability Parameter Safety Factor
GOC	Crossflow VIV Onset Safety Factor
KC	Keulegan-Carpenter Number
ALP	Current Velocity Flow ratio \(\alpha = \frac{U_c}{U_w + U_c}\) (where \(U_c\) is the current velocity, and \(U_w\) is the significant wave amplitude velocity)
AF	Frequency ratio between the last contributing mode and the next
mode
ICR	=1 to perform a Crossflow VIV analysis =0 for In-Line VIV analysis.

Note

The calculations are similar to the calculations performed with crossflow VIV analysis.
VIVIL must be used in combination with EIGENVIV to select manually the inline modes.