Offshore industry

K-EPSILON provides global aero and hydro solution, powerful tools and customized studies to help the Oil & Gas industry in their new challenges

-Deeper, further, and in more extreme environmental conditions
-Wave induced and vortex induced motionss (VIM) and related problems
-Solving fluid-structure interaction phenomena such as vortex induced viberation (VIV) and galloping

Computational fluid dynamics (CFD) is a powerful offshore design tool capable of accurate predicting complex flow phenomena. A key advantage is its ability to model the complex and arbitrary geometries that are typical of real-world equipment and environment.

Today, K-EPSILON's services help its customers with an accurate prediction of some of the most difficult offshore engineering problems, such as vortex induced vibration (VIV) issues, turret sloshing, vessel to vessel docking configurations, evaluation of current coefficents, platform seakeeping issues...

K-EPSILON is also able to provide Fluid-Structure Interaction (FSI) to model risers, flow lines, mooring system...

Simulation provides engineers with the ability to accurately determine the performance of design concepts, reducing the need for tank test and the building of prototypes. This makes it possible to evaluate many more designs in a shorter time, resulting in a substantial improvement in performance.


Customer references

Few examples .

Seakeeping of FPSO with Moonpool
Unsteady RANSE computations in very large waves 
performed unsteady RANSE computations with the free surface on a FPSO with the moonpool. This study was focused on the behaviour of the free surface inside the moopool. Numerous details of the moonpool geometry were considered, Mesh and time step concergence studies led to a half mesh of 25 million of full hexaedral cells.
Decay test 

Decay test on an offshore Floating Production Storage and Offloading (FPSO).
K-EPSILON has realised decay test for several vessels and companies. The methodology and the results were validated with experimental roll decay tests. The resulting decay behavior were in excellent agreement with the experimental results..
An initial heel angle is imposed before the vessel motions in heave and roll are released. The time step is adapted during the computation to accurately capture the vortex shedding of the bilge keels. 
Sea-Water Riser
Fluid-structure interaction simulation on a flexible sea water riser undergoing a large and rapid dynamic depressurization.
Proof concept for the project ETM lead by DCNS.
This problem is solved with K-FSI, using the strong coupling between FINE/Marine and K-Struct, the structural solver developed by K-EPSILON
Riser VIV in a stepped current
Vortex-induced vibrations on a riser in a , to study VIV (vortex-induced vibrations) phenomenon for Total.
Here K-FSI is used to predict the vortex-induced vibration behavior of a long riser (L/D = 500). The study wa performed for Total to validate CFD/FSI based VIV prediction as a superior option to existing VIV prediction tools. The riser is represented with beam elements in K-Struct with a pretension applied using a cable element at the top of the riser. FINE/Marine is used in the film here, but the case's mode shapes are also correctly reproduced with STAR-CCM+, Fluent and OpenFOAM.
Unsteady rigid motion of towed wing in waves
Unsteady FSI computation on a towed seismic deflector wing in waves
K-Epsilon used K-FSI to simulate the behaviour of the deflector wings of a towed seismic array in waves. The objective was to quantify the performance and hydrodynamic stability of different deflector wing designs. Here a deflector wing is towed by a very long cable in waves.  A Morison type fluid force is applied to the cable elements to include the drag and inertial effects of the cable on the behavior of the deflector wing.  
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