The New Orca3D v3 – Advanced Stability is Now Available !
On this occasion, the NDAR team co-hosted a webinar with Orca3D to present the new modules and features. (See recorded version).
Orca3D version 3 – Advanced Stability further enhances the features of the Orca3D software.
Find these enhanced features on the Orca3D website, where videos have been made available by the Orca3D crew to peruse the wealth of technical resources.
Frame Numbering Systems
Orca3D offers a comprehensive Frame Numbering System in all three orthogonal directions: X, Y and Z.
Setting up the Orca3D Frame Numbering System is very similar to defining Orca3D Sections. Orca3D Frames and Sections are defined separately because, although seemingly redundant, they fulfil different purposes.
Orca3D Framing is defined interactively and then used in many different ways: to snap to while defining compartments, to locate decks and other planes, to place custom subdivision geometry, etc.
Creating an Orca3D Design for Stability Analysis
Orca3D makes use of a realistic 3D volume subdivision to define tanks, compartments, voids, tonnage spaces, etc. and run stability analysis, tank tables, etc.
Volumes are defined by subdividing the ship’s external envelope into smaller volumes, which will then take on additional properties such as permeability, contents, deducting, etc.
The subdivision is fully parametric, and the derived data (tank tables, etc.) is documented on the fly. Volumes can refer to a frame ruler, to user defined locations, to existing geometry, etc.
Subdividing an Orca3D Design
Orca3D offers several tools to define volumes inside the hull (or any “shell” model). “Shells” are closed volumes called Components. Compartments are created by subdividing the Component(s), and then are designated as a Tank, Watertight Compartment, or Non-watertight Compartment.
Compartments can be defined parametrically and modified on the fly by, for example, moving a delimiting face such as a deck or a bulkhead (a face is a surface that knows it has two sides, each side is used to define one or more Compartments). Compartments can also be defined using Rhino objects such as surfaces, polysurfaces, closed polysurfaces, etc.
Compartments can be used for intact and damaged stability calculations as well as various other purposes. Regardless of their nature their characteristics are reported in a tank-table format, listed by contents, etc.
Modifying Compartments
Accurate compartments are crucial to run correct stability analyses. Orca3D allows the creation of the even complex geometry compartments by using dedicated modelling tools and parametric relationships. Compartments can also be merged, subtracted, relocated, etc. The user will set permeability, specify contents, etc.
Compartments and loads are then combined in load cases via orca3D’s interactive user interface. Full reports are provided on screen and in various standard document and file formats.
Adding Stability Criteria
- Orca3D applies stability criteria to its stability analysis runs, be they in intact or damaged conditions.
- Orca3D supports stability criteria based on angles, areas under the righting arm curve, GM values, etc.
- Orca3D includes a number of pre-programmed stability criteria but also provides tools to define additional ones.
- Free Surface Moments (FSM) are catered for, too, be they imposed values, expressed by VCG shift or computed dynamically.
Adding Heeling Moments
Adding heeling moments in Orca3D is essential for conducting a comprehensive stability criteria analysis under the effect of external forces.
Orca3D runs stability analysis using a user-defined set of heeling angles and heeling forces specified numerically or derived from the model’s geometry. Supported heeling forces & moments include wind, crane loads, towline pull, crowding, turning, and custom heeling moments.
Fluid Load Cases
- Orca3D supports both fluid and fixed loads, thereby allowing the definition of any relevant load case.
- Fluid loads are represented accurately by fill levels, type of fluid, compartment permeabilities, etc.
- Compartments can be intact or damaged and various free surface types can be specified.
- Load cases are managed interactively, making it easy and quick to define a full-scope stability analysis.
Running an Advanced Stability Analysis
Running an advanced stability analysis in Orca3D is a very straight forward process that starts with creating an Orca3D design and defining floodable and tight compartments (tanks, rooms, etc.), defining a light ship condition and composing a collection of fluid load cases.
Orca3D Advanced Stability evaluates the vessel’s stability under realistic conditions against class and user-defined criteria, etc. Multiple load cases integrate different stability criteria in a complete, single report.
