Turek-Hron FSI Benchmark simulations with TRACE and CalculiX
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The study examines the Turek–Hron FSI3 benchmark using a partitioned simulation setup that combines the compressible, density-based flow solver TRACE, the coupling framework preCICE, and the structural solver CalculiX. Although the benchmark is formally incompressible, a dedicated low‑Mach setup enables TRACE—originally designed for compressible turbomachinery flows—to operate stably in the incompressible limit. The work compares explicit and implicit coupling approaches and evaluates how different stabilization and acceleration techniques influence simulation stability, with particular focus on the added mass effect, which strongly destabilizes explicit schemes. Results show that TRACE can reproduce reference solutions with good accuracy but is highly sensitive to coupling parameters. Explicit coupling remains stable only under strong damping, whereas implicit coupling achieves robust, convergence-stable performance even under pronounced added-mass conditions. Overall, the study demonstrates both the feasibility of using compressible solvers for incompressible FSI problems and the necessity of appropriate stabilization strategies in partitioned coupling.
