Engineering Software

The following describes the major software packages that are owned or licensed by INTECSEA. In addition, several utility programs are used by INTECSEA that are not listed. More detailed descriptions of these programs are available upon request. Public domain software represents software packages available from engineering companies that deal solely with designing and developing programs.

WAMIT

WAMIT is a PC-based program which performs the 3D diffraction and motion global analysis. WAMIT is recognized for its ability to analyze wave interactions with offshore platforms. The software permits engineers to perform state-of-the-art hydrodynamic calculations for complex structures, with a high degree of accuracy and efficiency. Specifics of this software are as follows:

• Generalized modes of body motion specified by the user can be analyzed in addition to the rigid-body modes. This allows hydroelastic computations with full coupling between the structural and hydrodynamic solutions, and more efficient analyses of multiple bodies with constrained motions.
• A block iterative solver is implemented for the solution of the linear system.
• The scattered potential may be evaluated directly, and added with the incident wave potential to evaluate the total diffraction potential.
• The response amplitude operators can be evaluated either from the exciting forces based on the Haskind relation or from direct integration of the diffraction pressure.
• The mean drift force and moment can be evaluated for combinations of the wave headings (bi-directional waves).
• Selected outputs may be suppressed to condense the main output file.
• The wave periods can be input directly or specified by the corresponding values of the wave frequencies, infinite-depth wave numbers, or finite-depth wave numbers.

WAFRONT

WAFRONT is a Microsoft Windows styled front-end software for use with WAMIT. The main features of WAFRONT are listed below:

• Performs automatic data validation, which serves to ensure data integrity and eliminate input errors.
• Provides an environment for consistent and convenient input/output file management.
• Can analyze either a dimensionalized or non-dimensionalized WAMIT numeric file format.
• Calculates the fixed body motions to either:
  1. Earth
  2. Free-surface points
  3. Other fixed body points either on the same body or on different bodies
• Generates 2D or 3D (for multidirectional seas) plots for transfer functions or RAOs based on any numeric file either non-dimensional or dimensional.
• Plots response spectra and selected wave spectrum (eight commonly used spectra available).
• Selects maxima and minima transfer functions from any numeric file.
• Performs spectral analysis on any response using selected wave spectrum and then calculates short term statistics (maxima and significant values, mean drift, etc.) and up to the fourth spectral moments.
• Generates bitmaps, meta files or hard copies for 2D and 3D plots.

SESAM

SESAM is an integrated hydrodynamics/structural analysis software marketed by DNV software. The principal naval architectural portions of the package are:

• GeniE

  GeniE is a tool for designing and analyzing offshore and maritime structures made of beams and plates. Modeling, analysis and results processing are performed in the same graphical user interface. The use of concept technology makes GeniE highly efficient for integrating stability, loading, strength assessment and CAD exchange. All data is persistent enabling the engineers to do efficient iterative redesign of a structure.

• HydroD

  HydroD is a tool for hydrostatic and hydrodynamic analysis. By integrating these tasks significant cost savings may be achieved in the engineering phase since the same panel model may be used by one tool. HydroD is also the front-end GUI for WADAM and POSTRESP.

• WADAM

  Wadam is a general hydrodynamic analysis program for calculating wave-structure interaction for fixed and floating structures of arbitrary shape. Wadam is based on widely accepted linear methods for marine hydrodynamics the 3D radiation-diffraction theory employing a panel model (using WAMIT as the solver) and Morison equation in linearised form employing a beam model (created by GeniE).

• POSTRESP

  Postresp is a graphical postprocessor for statistical processing and presentation of response in frequency and time domain. Postresp will do statistical postprocessing of general responses given as transfer functions in the frequency domain or as time series in the time domain.

• SIMO

  SIMO is a time domain simulation program for study of motions and stationkeeping of multibody systems. Moorings and risers are quasi-statically coupled.

• DeepC

  DeepC is a tool for mooring and riser design as well as marine operations of offshore floating structures. It will perform mooring analysis separately or when including the coupled effects from risers and vessels. Furthermore, DeepC may be used for riser design where the risers are analyzed separately or when considering coupling effects. Marine operations may be simulated in the time domain for a study of motions and stationkeeping of multibody systems.

AQWA

ANSYS AQWA Diffraction provides an integrated facility for developing the primary hydrodynamic parameters required for undertaking complex motions and response analysis. Three-dimensional linear radiation and diffraction analysis can be undertaken with multiple bodies, taking full account of hydrodynamic interaction effects that occur between bodies. Although the software is designed primarily for floating structures, fixed bodies can be included in the models, such as breakwaters or gravity-based structures. Computation of the second-order wave forces via the full quadratic transfer function matrices permits use over a wide range of water depths.

AQWA is a fully integrated system consisting of modules for diffraction/radiation (AQWA-LINE), static and dynamic initial stability including mooring lines (AQWA-LIBRIUM), frequency domain with irregular waves (AQWA-FER), time domain with irregular waves including slow drift (AQWA-DRIFT) and nonlinear time domain with regular or irregular waves (AQWA-NAUT). These modules are encapsulated in the AQWA-Graphical Supervisor.

In addition, an optional integrated module for coupled Cable Dynamics is available with frequency and time domain modules as well as stands alone within the AQWA-Graphical Supervisor.

WINPOST

WINPOST is a time domain analysis program developed by Texas A&M University. It performs coupled hull, mooring, and riser static and dynamic analysis of floating offshore structures. WINPOST can analyze multiple (coupled) bodies in time domain while taking into account various nonlinear features - drag force on the hull, mooring lines, risers, large (translational) motion of the platform and the corresponding set-down, fluctuating free surface effects, and geometric nonlinearity of the mooring system. In the frequency domain analysis (for single body), the platform-mooring system is assumed to undergo small motions around the mean position so that a linear analysis can be applied. The drag forces are then linearized using a statistical linearization technique.

Except the Morison force, all the hydrodynamic forces on the platform, including added mass and radiation damping, first-order wave-frequency forces, second-order sum- and difference-frequency potential forces, and wave-drift damping are computed from WINTCOL or WAMIT.

In WINPOST, the environmental input includes regular and random waves, steady shear currents, and steady/unsteady wind forces on the platform. The random waves can be based on either the built in Pierson-Mostkowitz/JONSWAP spectrum module or the user defined wave components. The unsteady wind force time series, generated from API/NPD spectrum, is read from an external input file.

Additionally, WINPOST can perform coupled quasi-static analysis without mooring line dynamics in time domain. It can also perform uncoupled motion analysis for the mooring (riser) system with user defined platform motions.

WINDOS

WINDOS is a program developed by MARIN to estimate wind loads on offshore structures. The program has the capability to compute drag, lift and overturning moments on arbitrary structures in various tilted conditions. The program is based on a building block approach. The structure is modeled by a number of standard components for which the drag coefficients are stored in the program’s database. Shielding between the components and lift forces on elevated and tilted decks are modeled based on theoretical and empirical relations. Extensive wind tunnel tests have been carried out to validate the program results. WINDOS is also used to calculate current forces.

MIMOSA

MIMOSA is an interactive computer program developed and supported by Marintek of Trondheim, Norway. It is used for static and dynamic analysis of moored vessels. It is capable of computing static and dynamic environmental loads, corresponding displacement and motion of the vessel and static and dynamic mooring tensions. Static and quasi-static analyses including dynamic transient loading can be carried out for almost any type of system. Dynamic analysis is carried out in the frequency domain for both wave frequency and low frequency motion and tension responses.

DYNFLOAT

DYNFLOAT is a coupled time domain simulation program that analyzes the dynamic behavior of a turret or spread moored floating structure subject to wind waves and current. The program predicts the mooring loads (including mooring line dynamics) and structure motions (including the coupled effect of mooring lines). The dynamic behavior of the mooring system is computed in conjunction with the low frequency and wave frequency motions of the structure. The program requires first and second order hydrodynamic coefficients generated by a program such as WAMIT.

GHS

GHS is a general-purpose graphical interactive program used to both design and analyze the stability of any floating structure. The program is a Microsoft Windows based design tool and has the following features:

• Interactive model generation and analysis
• Graphical input and output
• Automatic generation of wind forces and moments for a range of heel angles
• Calculates allowable KGs based on the rule of associations such as ABS, USCG, DNV, NMD, and DEN

STABCAD

StabCad is a ship stability package which provides us with an interface where we can model the hull, simulate various conditions of floatation on it and derive the results. A reasonable amount of scripting can be done in the program using the beta file, this makes it quite flexible.

VISUAL ORCAFLEX

Visual OrcaFlex is a general purpose marine dynamics program developed by Orcina for static and dynamic analysis of a wide range of offshore systems, including all types of marine risers (rigid and flexible), global analysis, moorings, installation and towed systems.

Visual OrcaFlex provides fast and accurate analysis of catenary systems such as flexible risers and umbilical cables under wave and current loads and externally imposed motions. OrcaFlex makes extensive use of graphics to assist understanding. The program can be operated in batch mode for routine analysis work and there are also special facilities for post-processing your results including fully integrated fatigue analysis capabilities.

Visual OrcaFlex is a fully 3D nonlinear time domain finite element program capable of dealing with arbitrarily large deflections of the flexible from the initial configuration. A lumped mass element is used which greatly simplifies the mathematical formulation and allows quick and efficient development of the program to include additional force terms and constraints on the system in response to new engineering requirements.

Visual OrcaFlex element types include lines, 3D and 6D buoys, lump mass elements, vessels, winches, tethers, and various elastic solids. Multiple wave trains from various headings can be modeled. Wave types include Airy, Dean, Stokes 5th order and Cnoidal regular waves; ISSC, JONSWAP and Ochi-Hubble wave spectra; and a user-specified wave train option. In addition, current can be modeled with full 3D current profiles which allow for the variation of both current velocity and direction with depth.

In addition to the time domain features, modal analysis can be performed for individual lines and RAOs can be calculated for any results variable using the Spectral Response Analysis feature.

Results output includes animated replay plus full graphical and numerical presentation. Facilties for batch calculations and post processing are included with the program.

MACSI-2

MACSI-2 is a compter program for time simulation of marine crane operations and other lifting/emplacement operations. As well as regular motions more realistic motions in irregular sea can be simulated.

The input to the program is:

• a definition of lifting system components and configurations
• hydrodynamic description of the lifted body
• environmental conditions (seastate, current)

The output from the simulation is:

• motion of the lifted body, in 3 directions (no body rotation is included)
• lift line tension
• motion of the ship and crane point, force components and distances

•  Floating Structures
  • Public Domain Software
  • Proprietary Software
•  Tendon and Mooring Systems
  • Spread Mooring Design
  • Engineering Software
•  Drafting Design
•  3D Design Capabilities
•  Hull Systems
•  Naval Architecture
  • Engineering Software
•  Installation
•  Interface Management
  • Workflows and Processes
  • Interface Management Capability
  • Interface Management Tool
•  Construction Management
  • Design Support
  • Construction Planning
•  Project Management
  • WPMP
  • EMS
•  Materials Engineering
  • Materials Selection
  • Corrosion Management
  • Welding Engineering
  • Non-Destructive Testing