The current version of X-SEA includes the results of extensive research and development base on finite element program XFINAS, which was originally developed in Imperial College, London.
The X-SEA is an integrated finite element structural analysis software that provides for the nonlinear dynamic analysis and design of offshore steel and concrete structures, including oil and gas and wind farms.
The X-SEA provides a high-performance graphics of both GID 14 pre&Post Processor and Autocad with interactive and visual environment for the analysis and design of offshore structures.
The power of X-SEA is further enhanced by its speed and 64-bit capability with Multi-core Parallel Direct Sparse Solver using INTEL PARDISO.
For the design of offshore wind turbine structure, multiple load cases of wind turbine calculated from the OpenFAST (NREL, USA) can be combined with X-SEA environmental load.
Post-processing of integrated design results for Fatigue Limit State analysis (FLS) and Ultimate Limit State (ULS) analysis (GH Bladed & OpenFAST).
Option Features
OpenFAST Multiple calculation of wind turbine loads of OpenFAST with graphical input
X-SEA Coupled with OpenFAST Structural analysis and design of offshore structure coupled with OpenFAST wind turbine load
Solution Item
Inplace Analysis
Nonlinear analysis of frame, shell & solid elements(Geometrical and Material nonlinearity)
Eigenvalue Analysis (Frequency and Critical buckling load)
Linear Dynamics Analysis (Time Integration & Mode Superpostion, Frequency Domain)
Nonlinear Dynamics Analysis (Dynamics of large deformation of elastoplastic analysis using frame, shell and solid elements)
Environmental Load
Regular (5 Kinds) and Irregular wave (PM, JONSWAP Spectrum)
3D Morison wave pressure
3D Linear Diffraction wave Theory (Shell & Solid element)
Prestressed concrete analysis
SCF factor
Fatigue Analysis in Frequency and Time Domain
Mooring Analysis of Floating Structure
Pile Foundation Analysis (p-y,t-z,Q-z) and Pile Super element
Steel Code Check & Design
Ship Collison to Steel and Concrete offshore structure
Drafting & Material take off
Coupled Dynamic Analysis of FAST 8 turbine and substructures
Postprocessing the Fatigue analysis using GH-Bladed and FAST 8 output
Lifting/Transportation/Fabrication analysis

Introduction of X-SEA (Solver)

How to solve : [K]{x}={f}, {x}= ?[K]=

X-SEA uses 64 bit Intel Parallel Direct Sparse Solver (PARDISO).

The newly restructured X-SEA using 64 bit PARDISO package is very fast, high performance, robust and memory efficient software for solving large sparse symmetric and unsymmetric linear systems of equations on shared memory multiprocessors.
The 64 bit system of X-SEA is extremely faster than 32bit X-SEA shown in the table.
The degree of freedom of model is almost unlimited by the efficient memory management system.

Test of square plate under uniform pressure using 4-node shell element (256X256 meshes).

Meshes Elements CPU Time (sec) in 64bit Result (m) Analtical Sol:1.264 Non-dimension
2 x 2 4 0.19 1.211 0.95807
4 x 4 16 0.22 1.251 0.98972
16 x 16 256 1.05 1.262 0.99842
32 x 32 1,024 2.94 1.265 1.00079
48 x 48 2,304 5.2 1.265 1.00079
64 x 64 4,096 7.95 1.265 1.00079
96 x 96 9,216 16.97
(133.63 Sec in 32 bit)
1.265 1.00079
128 x 128 16,384 29.17 1.265 1.00079
196 x 196 38,416 74.11 1.265 1.00079
256 x 256 65,536 131.52 1.265 1.00079

Analytical solution: 1.264