DNVGL SIMA 4.2

SIMA
Sima is a simulation and analysis tool for marine
operations and floating systems — from modelling to
post-processing of results.

Release Note Reference
Option to calculate retardation function from added mass and damping
added to plot editor
SIMA-9812
Fluctuating 3-comp wind, IECWind format (DTUMann)
The default value for number of slices in core has been increased from 10 to
800. This is expected to increase the CPU efficiency when the IECWind
(DTUMann) format is used in the analysis.
SRV-1688
When using parametric wind spectra in coupled analysis the wind velocity
time series is now reported for the hub position. Previously the wind velocity
time series were reported for the reference height of the wind coefficients.
Wind velocity for turbine blades will now be computed by taking the blade
element vertical position into account. Previously the wind velocity at wind
coefficients reference height was used for all blade elements.
This means that results will change slightly compared to older versions.
The new behavior is consistent with how other calculations are made with
other wind types, i.e. Stationary Uniform, Fluctuating two and three
component wind types.
SRV-1749
The Constant Tension Control in Simple Wire Coupling now has input to
specify activation time and deactivation time.
SRV-1685
New Features - RIFLEX
Release Note Reference
Combined blade pitch, electrical power and yaw control system
The external wind turbine control system may now also include Nacelle yaw
control. Currently only one wind turbine can have an external control system.
SRV-1768
A hydrostatic/hydrodynamic load model that accounts for partially
submerged cross section has been made available for thin-walled pipe cross
sections (CRS0), axis-ymmetric cross sections (CRS1) and double symmetric
cross sections (CRS2) as a new hydrodynamic load type. This load model is
available for both beam and bar elements and may be used in dynamic
analyses with regular or irregular waves. Both lumped and consistent
formulations are available.
The new load model will give similar results to the existing partly submerged
cross sections (CRS3 and CRS4) which could not be combined with irregular
waves.
SRV-1706
Several options for controling MatrixPlot storage has been added to static
calculation parameters in RIFLEX
SIMA-9552
| Sesam Release Note | Sima V4.2.0 | www.dnv.com/digital Page 8

Release Note Reference
Eigen value analysis can be performed for cross section with MacCamy &
Fuchs wave loads
SRV-1729
Add TD VIV load for CRS0 cross-sections SRV-1758
Storage of dynamic results for seafloor and soil contact elements
An option has been added to toggle storage of results for seafloor and soil
layer profile (SLP) contact elements.
These results are available from nonlinear simulations only. If storage is
specified, they will be stored for all seafloor / soil contact elements attached
to beam or bar elements for which force storage is specified.
The results were previously exported if force storage on an additional file
was specified; i.e. if IFORFM was nonzero. The results will now be exported
if the new option IBOTFM is nonzero.
The default is no storage of seafloor / soil contact results, so the input file
must be changed if these results are wanted.
SRV-1713
Fluctuating 3-comp wind, IECWind format (DTUMann)
The default value for number of slices in core has been increased from 10 to
800. This is expected to increase the CPU efficiency when the IECWind
(DTUMann) format is used in the analysis.
SRV-1688
An option have been added to allow the added mass and damping to be given
in non-dimensional format for the MacCamy & Fuchs wave loads.
SRV-1728
Improve error message using tabulated spectrum and too large time
step.
Too large time step gives a Nyquist frequency smaller then the largest
frequency in the tabulated spectrum. The error message is improved.
SRV-1440
Time domain VIV load for stress joint (Restricted functionality)
Time domain VIV load model is available for stress joints.
SRV-1787
Option for calculation of arclength for result presentation
The user may now choose whether the arclength is accumulated throughout
the whole system or starts at zero for each line. The arclength was previously
always accumulated over all lines.
In SIMA the default is to start at zero for each line. In standalone RIFLEX the
default
is to accumulated the arclength throughout the system.
The arclength is mainly used for results on the MatrixPlot files.