Naslov
Development of automatic fringe assembly algorithm for overset meshes in Foam-Extend software

Autori
Katavić, Josip

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
13.07

Godina
2018

Stranica
126

Mentor
Jasak, Hrvoje

Ključne riječi
Overset mesh ; Overset fringe assembly ; Overlap minimization ; Side launching of a ship ; foam-extend ; Naval Hydro Pack

Sažetak
In this thesis, overset mesh approach used in foam-extend software, newly developed fringe assembly algorithm and side launching of a ship by tipping table theory are pre- sented. Throughout the past few decades, the overset mesh approach, also known as Chimera and overlapping mesh approach, is being developed in the field of Computa- tional Fluid Dynamics (CFD). Overset meshing refers to the use of multiple discon- nected meshes (overset regions), which are meshed separately, to discretise the flow domain. Overset mesh system typically consists of a background mesh adapted to the environment and one or more overset meshes attached to bodies, overlapping with the background mesh. This approach has much of its advantages in the computation of multiple-body and moving body problems as well as in parametric studies and optimi- sation analyses. The interpolation of the field data between meshes occurs through the fringe layer. For the purpose of this thesis, an automatic fringe assembly algorithm for overset meshes is developed and implemented in foam-extend software. Validation has been carried out on three test cases without and one test case with fluid flow present. The first test case was a two-levels mesh of a cylinder in a channel. Capability to obtain static and dynamic overset mesh assembly was tested. The second test case was a three- levels mesh of NACA 4412 airfoil, where the capability of obtaining static overset fringe assembly on overset mesh system which contains more than two meshes was tested. The third test case was six- levels ONR Tumblehome ship. The last test case was a side launching of a tanker by tipping table principle, where the capability to obtain dynamic overset fringe assembly with a presence of fluid flow, as well as Naval Hydro Pack, were tested.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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