Fluid-structure interaction

Fluid Structure Interaction

The developpement of the FSI Software K-FSI start with the modelisation of sail.
At the begining we developped a structural code coupled to a fluid pannel code software to modelize the flying shape of a genoa and a jib.
Then in 2007 we start to coupled the structural software to Isis CFD throw a PHD with Ecole Centrale de Nantes / K-Epsilon and M. Durand.
This PHD was focus on two aspects:
- Developped a strong and deep coupling between the structural sofware and the RANSE Solver
- Developped a robust mesh deformation tool abble to take into account the deformation of the 3D volume mesh during the unsteady RANSE Computation 

After this first academic developpement K-Epsilon realised three more PHD to improve the performance of K-FSI

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

- K-EPSILON's innovative and efficient FSI algorithm 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, the sailmakers are able to compute the flying shape of the sails and calculs the efforts on sails and the rig. A lot of sailmaker customer use K-FSISail as Incidence, Doyle .....

Automatic trimed of two genaker
Fluid Structure Interaction on two genaker
K-Epsilon realized a study for the saimaker Incidence to analyse the stability of two genaker. We developped an automatic trimed tool  able to trim the sheet of the genak with the behaviour of the luff.
The study was done on two different genak for the Vendée Globe

Vortex Induced Vibration on a riser
Fluid Structure Interaction on a riser
Vortex Induced Vibration on riser or spool is the more comon problem of structural vibration in the offshore industry. The Von Karman vortex sheding wake induced unsteady forces on the structure which start to oscillate to the lock in frequency. These oscillations generate fatigue and then could break the riser or the spool.
K-Epsilon collaborate with Total Energy during 5 years to improve and validate K-FSI on riser and then spool. Tank test have been done  during a CITEPH project to validate the accuracy of the prediction of K-FSI.
Fluid Structure Interaction on foil 
Foil deformation of Groupama 3
Towed Body
RANSE computation performed by NUMECA with FINE/Marine.
developed Epsilon
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