K-EPSILON provides aero-structure solutions  to help the flexible membrane industry 

- Sail performance
- Inflatable structures
- Parachutes
- Airships

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 wind tunnel 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 .

Comparison of two gennakers
Unsteady RANSE computation on two gennakers (from Incidences Sails).
Sailpack was used to design the two sails. Computation were performed with K-FSI using the coupling between FINE™/Marine and K-Struct.
The video shows the unsteady mesh deformation around the sails performed by K-FSI.
Fluid-structure interaction on parachute
Here the deployed flying shape of the parachute is computed. The parachute structure  is modeled with a combination of membrane elements for the parachute fabric elements and cable elements for the cords. The case is challenging for mesh deformation because the initial design molded shape is very different from the final flying shape. 
Quasi-static FSI on a blimp
RANSE computation performed on a blimp with cable-stayed rigid ailerons and membrane body..
Drop test of an inflated cargo cushion
Here an inflated membrane is used to protect a piece of cargo in the event of drops. The structure is modeled with K-Struct using membrane elements and contact elements to represent the ground.
Cargo lifting with an inflatable membrane bag
Structure computation to model lifting a heavy piece of cargo using the inflation of a bag. Here the contact between the cargo and bag as well as the bag and ground are modeled with contact elements. The pressure is slowly increased inside the bag and the bag modeled as membrane elements inflates.
Seakeeping of DTMB
CFD FSI test case of Turek and Hron
Turek and Hron proposed three two-dimensional test case of increasing difficulty. The cases consist of a 2D membrane placed behind a cylinder. The numerical experiment consisted in simulating differ combinations of fluid and structure characteristics and measuring the forces and deformations generated. Due to the lightweight nature of the structure in the third case, very few FSI solvers are capable of accurately and stably resolve this case.  .
K-FSI is able to replicate without difficulty all three test cases 
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