The analysis of containment phenomena in SMRs is challenging, and has to take into account effects that present themselves at a large range of scales. A proposed solution to tackle this multi-scale problem is to decompose it into multiple sub-domains, and solve these concurrently in a coupled approach (e.g. coupled CFD and system codes).
In this seminar, we present our approach to implementing a coupling infrastructure for containmentFOAM, an open source CFD code for containment analysis developed at Jülich Research Center, based on OpenFOAM. An extension with the standardized and open co-simulation interface FMI is discussed. Here, for improved simulation convergence and computational efficiency, a semi-implicit calculation scheme with adaptive time stepping is used. Furthermore, a coupling with the system modeling solution OpenModelica is shown, which is used to produce system thermal-hydraulic lumped-element models.
Based on the described open-source simulation infrastructure, a technological demonstrator is presented: the validation of a pressure suppression safety system model as employed in current light water-based SMR concepts.