DNVGL Sesam HydroD 6.1.01

HydroD is an interactive application for computation of hydrostatics and stability, wave loads and motion response for

ships and offshore structures. The wave loads and motions are computed by Wadam or Wasim in the Sesam suite of

programs.

HydroD is now developed on a new IT platform in accordance with DNV – Digital Solutions technology roadmap. The

last version on the old platform is HydroD 4.10. Development of the new HydroD to replace HydroD 4 is done in three

main steps. HydroD 5 supports stability analysis only, while in HydroD 6 support for Wadam is added. HydroD 6.0 has

full support for Wadam in addition to the stability analysis except multibody analyses. Multibody has been included in

current release version 6.1. For Wasim users the current official version is HydroD 4.10. Support for Wasim is planned

to be included in HydroD 7.

TutorialWadam1 adds some new features, in addition, two new tutorials, TutorialMultiBodyWadam and TutorialDipole,

have been added in the Examples folder. It is recommended that the users go through these tutorials as a start. A clean

js file with all the modelling is also attached for all tutorials.

2 NEW FEATURES

2.1 Support for Wadam multi–body analysis

Wadam multi body analysis is supported in version 6.1. Notice that in HydroD 6.1 an analysis only needs to be defined

as multi–body if it includes more than one regular body. There are several limitations when doing multi–body analysis.

Datachecks for these have been implemented.

2.2 Support for dipole elements in Wadam

This is a major new feature in Wadam 10.1. Dipole elements are implemented for both the panel model and

compartment model. The elements are selected by using sets.

2.3 Support for other new features in Wadam 10.1.

All new features in Wadam 10.1 are supported. In addition to the dipole elements the two most important are:

• Middle–field computation of mean drift forces

• Directional dependent critical damping

The datachecks are updated according to Wadam 10.1.

2.4 More general HeelingForceModel

In HydroD 6.1 it is possible to include several HeelingForce concepts in one HeelingForceModel. As an example, this

allows for adding User defined heeling forces to a Shape coefficient model. This is particularly important for stability

analysis of floating wind turbines.

2.5 Other new features

• Improved datachecks

• Improved handling of additional matrices