Moving mesh methods in CFD


The moving mesh methods are specific tools implemented and emphasized in the last years in the fluid dynamics simulation code STAR-CCM+ as a natural and interesting extension of the classical CFD applications, allowing for the simulation of the effective motion of objects which interact with the fluid around. The methods we focus on involve rigid motions coupled with grid deformation motions and, recently, overlapping grids motions. In the first case, it is necessary to recreate the deformed mesh. In this sense, we develop and implement techniques for the automation and the optimization of the re-meshing process and for the mesh-independence of the solution. In the case of the overset mesh method, the re-meshing is not necessary, the data exchange between the moving object and the fluid background takes place across a volumetric interface. The challenges we face consist in applying this method to complex geometries-parts of experimental facilities, with narrow flow paths and moving bodies with accurate design details.

In the framework of the MAXSIMA project, whose objective is the safety assessment in the nuclear facility MYRRHA, these methods are used in order to reproduce and test the passive activation of the control rods system in the case of an extreme event such as the emergency shutdown of the reactor. The application aims in the first place to prove the feasibility of such innovative simulations, to validate the simulations against experimental tests, which are ongoing in Belgium during this project and finally to provide inputs for the safety analyses. Concretely, the simulation provides information concerning the control rod insertion time (estimated at less than 1 second), the correct passive operation based on the forces acting on the moving assembly-drag, buoyancy, gravity, the pressure drops and the mass flows supplied by the pumps and by the natural circulation of the liquid metal in the primary loop of MYRRHA.

Questo sito utilizza cookie tecnici e assimilati. Possono essere presenti anche cookie profilazione di terze parti. Se vuoi saperne di piĆ¹ o negare il consenso a tutti o ad alcuni cookie leggi l'informativa completa. Proseguendo nella navigazione (anche con il semplice scrolling) acconsenti all'uso dei cookie. This site uses technical and anonymized analytics cookies only. There may also be profiling third-party cookies. Please read the cookie information page to learn more about how we use cookies or blocking them. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.