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Couplings in Trio_U
 General introduction

Because of the increase of the computational power, the improvement of the programming languages, of the numerical methods and of the physical models, the complexity of the physical problems that can be studied by numerical simulation constantly increases. In particular, the ingineer demand turns towards the possibility to treat coupled problems. In that purpose, research and development actions are currently carried out in the Trio_U project and two issues are more particularly studied.

The first one deals with the coupling of physical models. In particular, in the study of the thermal-hydraulic behavior of nuclear reactors, it is important to study the couplings between a fluid region and a porous medium.

The second issue deals with the coupling between different computational codes. Indeed, some computational codes, like Trio_U, are more particularly dedicated to a local modeling of flows, whereas other codes, like Cathare, are optimized to solve problems at a much larger scale (they are called system codes). For some applications, it can be important to simulate the entire circuit with macroscopic models and to simulare more precisely a part of the circuit.


 Multi-scale coupling

In many applications, it is important to model the transfers at the interface between a free fluid region and a porous medium. In the framework of the study of nuclear reactors, the core is highly charged with nuclear fuel and it is generally modeled as a equivalent porous medium. The other parts of the reactor are much less charged with solid parts and a porous modeling is not always necessary. Consequently, it is important to couple the free fluid and porous model accurately.

Multi-scale coupling

 Inter-code coupling

 

Any computational code has its own domain of application for which it is optimized. In the framework of the study of the nuclear reactors, the Cathare system code is thus optimized to simulate the flows at the scale of the entire reactor and not only of the nuclear core. However, unlike the Trio_U code, it is not well adapted to the fine simulation of 3D flows. In some applications, it is important to account for both the system effect and the details of the flow in some parts of the circuit. That is why it is important to couple these codes.

 

Inter-code coupling

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