Fluid-structure interaction

Fluid Structure Interaction

The developpement of the FSI Software K-FSI started with the modelisation of sails.
At the begining we developped a structural code coupled to a fluid pannel code software to modelize the flying shape of upwing sails such as genoas, jibs and main sails.
In 2007 K-EPSILON invested in a first PhD, in collaboration with Ecole Centrale de Nqntes to start to the coupling of the K-Struct structural software to ISIS-CFD, the fluid solver of FINE/Marine..
This first PhD was focus on two aspects:
- Developing a strong and deep coupling between the structural sofware and the RANSE solver
- Developing a robust mesh deformation tool able to take into account the deformation of the 3D volume mesh during the unsteady RANSE Computation

After this first academic developement K-Epsilon realised three more PhDs to further improve the performance of K-FSI and maintain K-FSI at the cutting edge of strongly coupled FSI.

- K-EPSILON's fluid-structure interaction capabilities are able to simulate the motion of soft or rigid structures simultaneously with the viscous fluid behavior for even the most strongly coupled problems.

- K-EPSILON's innovative and efficient FSI algorithm typically requires only 30% more computational effort than an equivalent dynamic computation without FSI

K-Epsilon start a partership with BSG solution in 2007 to integrate the FSI tool to Sail Pack. With Sail pack and K-FSISail, sailmakers are able to compute the flying shape of the sails and calculs the efforts on sails and the rig. Many of the leading sailmakers such as Incidence and Doyle sails use K-FSISail to maximize their sail's performance...

Automatic trimming of two gennakers
Fluid Structure Interaction on two gennakers
K-Epsilon realized a study for the saimaker Incidence to analyse the stability of two gennakers. We developed an automatic trimming tool to enable us to trim the gennaker sheet acounting for the behaviour of the luff.
The study was done on two different gennakers for the Vendée Globe

Vortex-induced vibration on a riser
Fluid-structure interaction on a riser
Vortex-Induced vibration on riser or spool is a common problem of structural vibration in the offshore industry. The Von Karman vortex shedding in the wake induces unsteady forces on the structure which start to oscillate due to the lock in frequency. These oscillations can lead to structural fatigue and then could break the riser or the spool.
K-Epsilon collaborated with Total Energy during 5 years to improve and validate K-FSI on risers and then spools. Tank test validation was done during a CITEPH joint industry project to validate the accuracy of the prediction of K-FSI.
Fluid structure interaction on foil 
Foil deformation of Groupama 3 in waves.
Dynamic stability of a towed body
The dynamic stability of a towed body used for hydroacoustic testing was investigated with FSI. The body was towed with cable elements with a Morison type fluid force added to include the behavior of the cable fluid forces. A perturbation was applied to the towed body and the motions were analyzed to insure they stayed within prescribed bounds.
developed Epsilon
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