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Fluid-Structure Interaction Modelling with Europlexus Fast Dynamics Software

Fluid-Structure Interaction Modelling with Europlexus Fast Dynamics Software. S. Potapov EDF R&D – Analyses in Mechanics and Acoustics. Colloque GDR Interaction Fluide-Structure Sophia Antipolis, 26-27 September 2005. Outline. Industrial context Numerical tool

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Fluid-Structure Interaction Modelling with Europlexus Fast Dynamics Software

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  1. Fluid-Structure Interaction Modelling with Europlexus Fast Dynamics Software S. Potapov EDF R&D – Analyses in Mechanics and Acoustics Colloque GDR Interaction Fluide-Structure Sophia Antipolis, 26-27 September 2005 Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  2. Outline • Industrial context • Numerical tool • Incompatible FS interface • Validation example • Conclusion Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  3. Main Primary Circuit of PWR Pipeline model Reactor vessel Mixed pipeline / 3D model GV PP anti-whipping devices break 1D/3D Fluid-Structure link Loss Of Coolant Accident (LOCA) Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  4. EUROPLEXUS fast dynamics code (initiated by CEA in 1978, and developed jointly by CEA, JRC, EDF, SAMTECH since 2000) Principal models available for the FSI analysis: Main characteristics: • 1D elements : • transient phenomena (wave propagation) • fluids, structures and their interaction (FSI) • Lagrangian, Eulerian and ALE formulations • geometric and material non-linearities • 1D, 2D, and 3D modelling (1D/3D connexions) • finite element formulation + transport terms • explicit time integration rigid and flexible walls • pipes: • multi-pipe links: • pump, break, local pressure losses • 3D fluid and structure elements • tetrahedron, cube • beam, plate, shell • 1D-3D F and S connexions Domains of analysis: Applications: - nuclear reactors - chemical plants - off-shore structures - submerged pipelines - safety valves 1) pipe circuits 2) hydrodynamics 3) explosions 4) impacts 5) robotics • Compressible fluid materials: • gas (perfect) • two-phase water • - homogeneous equilibrated • - steam tables • pressure losses (distributed) Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  5. vF Dynamic equilibrium over the whole domain: n Fluid n F F M ü = Fext - Fint -r r vS S S Structure Kinematic links: C v = b equality of reactions compatible meshes compatibility condition Equilibrium for the FS interface d.o.f.: mn ün = fext- fint +rn n n vF.n = vS .n For inviscid fluid: Reactions at the FS interface: rn = CTl Incompatible FS interfaces: Hierarchical type interface Fluid Structure 3D Fluid-Structure coupling in EUROPLEXUS Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  6. node Non-matching coupling conditions Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  7. Experiment V32 Initial conditions: HeissDampfReaktor (KFA/ISR, Germany, 1980) (Superheated Steam Reactor) break Core barrel Blowdown nozzle Membrane water Blowdown nozzle: L = 1.37 m A = 0.0314 m2 Core barrel: H = 7.57 m R = 1.32 m t = 0.023 m Mass ring: M = 13500 kg Downcomer P = 11 MPa T = 300 °C Pressure vessel Mass ring Lower plenum FSI simulation of LOCA accident in HDR Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  8. Coarse mesh Refinment procedure Fine mesh Fluid mesh Structure mesh Nb. of elements : Incompatible interface Fluid : 35854 Fluid : 34204 Structure: 2080 Structure: 1148 HDR model with EUROPLEXUS Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  9. Evolution of pressure P x 0.1 (MPa) P x 0.1 (MPa) compatible mesh incompatible mesh Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  10. Time histories of pressure and displacements Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  11. Calculations with and without FSI Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  12. Matching mesh: Non-matching mesh: Fluid: 35854 FE Fluid: 34204 FE Structure: 2080 FEStructure: 1148 FE on Compaq a 25 4 Time performance Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

  13. Conclusion • The use of the new non-matching FS interface algorithm allows realistic prediction of different physical phenomena characterising the LOCA situation • This algorithm allows optimising physical modelling and mesh generation for the fluid and structure domains • The CPU time is drastically reduced Colloque GDR Intéraction Fluide-Structure, Sophia Antipolis

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