Starting a wave structure interaction CFD simulation from an advance time: Hot-start
Date
2018Author
Metadata
Show full item recordAbstract
This paper details the reduction of an OpenFOAM CFD WSI simulation to its major event, by starting it at an advance time: a new procedure named hot-start, which is a first step towards a future coupling development. The investigations concern the fluid flow and a structure motion hot-start, taken separately, and are restricted to numerical comparison. Four design waves based upon the NewWave theory are simulated with increasing starting times - where the wave field is initialized as the sum of the linear components of the considered wave - and compare to conventional ones - which are initialized with still water. The structure motion hot-start is assessed using a heave decay test: a conventional heave decay simulation is compared against several ones where the motion, velocity and acceleration of the structure are assigned for several time-steps. An initial mesh-deformation library is specifically created to assign the structure at the hot-start position by incrementally deforming the mesh towards the right structure position. Independent to the non-linearity of the case, a start 4 s prior to the main event is found to be enough to accurately represent the wave field. The motion of the structure was found to require at least 5 time-steps in order to converge to the reference one. Those results aim to be usable for other CFD WSI applications.
Collections
Place of Publication
Journal
Pagination
Conference name
Start date
Finish date
Recommended, similar items
The following license files are associated with this item: