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NUMERICAL MODELLING OF MECHANICAL COUPLING IN FLUIDS & STRUCTURES SOFTWARE fluidyn - MP

NUMERICAL MODELLING OF MECHANICAL COUPLING IN FLUIDS & STRUCTURES SOFTWARE fluidyn - MP. PRESENTATION OF fluidyn - MP. General : role & utility of Computational Fluid Dynamics. A reliable numerical representation of a real processus with the help of well adapted physical models

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NUMERICAL MODELLING OF MECHANICAL COUPLING IN FLUIDS & STRUCTURES SOFTWARE fluidyn - MP

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  1. NUMERICAL MODELLING OF MECHANICAL COUPLING IN FLUIDS & STRUCTURES SOFTWARE fluidyn - MP

  2. PRESENTATION OF fluidyn - MP

  3. General : role & utility of Computational Fluid Dynamics A reliable numerical representation of a real processus with the help of well adapted physical models Easy to use & adapted to optimisation studies in industrial processes Economic with a security advantage Ideal complementary tool for experimental measurements Access to physical variables (velocities, pressure, temperature, etc.) at each point in the domain

  4. Software fluidyn - MP, FSI model Strong coupling & conjugate heat transfer between fluid & structures integrated in a single software platform Robust physical models & various well adapted solvers Finite Volume Method for fluids and Finte elements method forstructures Automatic exchange of boundary conditionsbetween fluids & structures - Adaptative Fluid Mesh Local time step usedto reduce CPU time

  5. Fluid Solver Solution of Navier-Stokes Equations 3-Dimensions Compressible / incompressible Mechanical / thermal shocks Viscous / non-viscous Laminar / turbulent Multi-species Multi-phase

  6. Fluid Solver Non-Newtonian Flows : Bingham law Power law Chemical – combustion reactions Arrhenius model Eddy-break-up model Eddy dissipation model Deflagration & fire BLEVE Pool fire Detonation JWL model Two phase flows droplets, bubbles, particles Euler-Lagrange Monte-Carlo, Free surface flow ( VOF method + CSF method)

  7. Fluid Solver Free surface two phase flows VOF method (Volume of Fluid) Finite volumes solution Adapted to gravity controlled flows whose interfaces undergo large deformations 3 high order convective schemes (Inter-Gamma Differencing, HRIC & CICSAM) CSF method (Continuum Surface Force) for modelling surface tension

  8. Fluid Solver Free surface two phase flows ALE method (Arbitrary Lagrangian Eulerian) Finite volumes solution adapted to problems needing a fine modelling & whose interface undergoes small deformations 2 solution algorithms : Donor Cell (1st order) & Van Leer (2nd order) easy calculation of surface tension

  9. Fluid Solver Two phase Euler / Lagrange flows Euler / Lagrange method adapted to flows with the presence of a dispersed phase diluted or dense flows monitoring each particle trajectory jet, fluid bed flows modelling, etc.

  10. Fluid Solver Two phase Euler / Lagrange flows Particle size distribution various distribution methods : uniform, gaussian, Rosin-Rammler type, Nukiyama-Tanasawa type, user routine non uniform distribution : statistic method of Monte-Carlo wall interaction accounted for via a restitution coefficient modelling inter-particle collisions, coalescence phenomena, rupture & agglomeration

  11. Fluid Solver Turbulence Algebraic Models • Baldwin- Lomax Mixing Length : • Van Driest damping • Abbott & Bushnell • Cebeci- Smith Sub grid scale model SGS Two equations transport (k - e) & RNG Reynolds stress model (anisotropic turbulence)

  12. Fluid Solver Equations of State Perfect gas Ideal gas JWL (Jones - Wilkins - Lee) for explosions Linear - polynomial User defined Viscosity & Prandtl number Temperature functions User defined

  13. Fluid Solver Spatial discretization schemes Explicit : Van Leer Flux Vector Splitting Roe Flux Difference Splitting 3rd order Advection Upwind Splitting, HLLC Semi- implicit : Weighted Upwind Scheme QSOU 2rd order Implicit : Central Difference Scheme 3rd order Flux Limiter Scheme (Van Leer, SMART, etc.)

  14. Fluid Solver Temporal discretization scheme Explicit : Time step • global minimum for transient simulations • local for steady state simulations convergence acceleration Temporal Integration • 6 step 2nd order Runge Kutta. Implicit: Gauss-Seidel or Jacobi iterative methods steady state calculation & low velocities.

  15. Structured solver • FINITE ELEMENTS • 3D beam elements • 3 node shell elements • 4 node tetrahedral elements • Material characteristics • Linear elasto-plastic, orthotropic • Piecewise linear • Non linear plastic

  16. Structured Solver Small deformations & large displacements Finite Elements method Large deformations Finite Elements method Finite Elements solvers Explicit / implicit Rayleigh damping

  17. Structured solver • Boundary Conditions • Transient or constant • Outside : at nodes : temperature, forces, displacements at faces: pressure, volume forces • Imposed automatically in fluids & structures • Modelling displacement of fluid mesh with UpdatedLagrangian method

  18. Heat transfer modelling Automatic simulation of convective & radiative heat transfer Radiation models Transparent media • Automatic calculation of 3D view factors • Shadow effect of intermediate obstacles Opaque Media • Six-Flux model • Discrete ordinate model Thermal analysis • Material properties w.r.t temperature • Conduction with Finite Elements method.

  19. Fluid solver • Fluid temperature • Heat transfer coefficient • Distribution of boundary pressures Iterations until convergence • Thermal solver • Transient heat transfer • Solid temperature • Structured solver • Thermal load • Mechanical load (pressure) • stress & deformations FLUID-STRUCTURE REMESHING Computation Procedure - 4 steps

  20. Pre - processor Mesh Multi-block structured Un-structured • Delaunay method • 2D & 3D meshes • Hybrid, tetrahedral or hexahedral mesh Adaptative mesh • Shocks, turbulent boundary layers, .. • Refined mesh & automatic interpolation of the solution. Interactive, simple & automatic Complex geometries

  21. Post - processor Geometry & computation parameters visualisation during simulation. 3D colour visualisation. Multi-viewport facility : upto 30 viewports Comparison of results obtained from different computations Vectors, iso-contours, iso-surfaces & 3D current lines Translations, rotations, multi projections XY plots: residual & other parameters Animations

  22. Fluidyn - MP : STUDY CASES FLUID – STRUCTURE MECHANICAL INTERACTIONS DOOR OPENING UNDER FLUID PRESSURE AEROSPACE TOBOGGAN FLAPGATE OPENING UNDER FLUID PRESSURE TNT EXPLOSION TUNNEL (BOURGES)

  23. fluidyn-FSI Simulation of large displacements & large structural deformations due to fluid movements STRONG COUPLING by 2 METHODS Finite Volumes (FV) for fluids Finite Elements (FE) for solids FLUID – STRUCTURE INTERACTION

  24. Fluid Solver • Fluid Temperature • Coefficient of heat transfer • Pressure distribution at the boundaries Iterations until convergence • Heat Solver • Transfer of transient heat • Temperature in solids • Structured solver • Heat load • Mechanical loads (pressures) • stress & deformations FLUID-STRUCTURE REMESHING Calculation Procedure - 4 steps fluidyn- FSI

  25. STUDY 1 : OPENING OF A DOOR UNDER FLUID PRESSURE

  26. TARED DOOR DESCRIPTION - Opening of a door under fluid pressure effect. - Modelling with the help of the software Fluidyn - FSI Chambre à 30 bar Porte -----> fluidyn- FSI

  27. RESULTANT OF DISPLACEMENT IN THE DOOR fluidyn- FSI

  28. DOOR DEFORMATION fluidyn- FSI

  29. PRESSURE CONTOUR fluidyn- FSI

  30. PRESSURE CONTOUR fluidyn- FSI

  31. PRESSURE CONTOUR fluidyn- FSI

  32. PRESSURE CONTOUR fluidyn- FSI

  33. STUDY 2 : OPENING OF A FLAPGATE UNDER THE EFFECT OF FLUID PRESSURE

  34. PROBLEM - A flapgate situated at the end of a pipe opens under the action of fluid flow - Modelling with the help of Fluidyn - MP - fluid = water, inlet velocity = 1.07 m/s - flapgate = steel slab - 3D flow, strong coupling between fluid & structure fluidyn- FSI

  35. GEOMETRY OF THE PROCESS fluidyn- FSI

  36. DOMAIN MESH Fluid = Finite Volumes Structure = Finite Elements fluidyn- FSI

  37. FLOW IN THE MEDIAN PLANE fluidyn- FSI

  38. FLUID PRESSURE ON THE STRUCTURE fluidyn- FSI

  39. FINAL STATE fluidyn- FSI

  40. STUDY 3 : WIND RESISTANCE OF AN ESCAPE CHUTE

  41. PRESENTATION DESCRIPTION • Wind resistance of an escape chute submitted to a lateral wind of 25 nodes • Simplified Case : isolation des arcs & the runways for the simulations • Structural Modelling with the help of finite elements of beam type • Fluid Modelling (air) with the help of finite volumes • Results searched for : deformations & maximum stress

  42. CHARACTERISTICS

  43. FLUID MESH

  44. STRUCTURAL MESH

  45. BOUNDARY CONDITIONS

  46. RESULTS : DEFORMATIONS

  47. RESULTS : DEFORMATIONS

  48. RESULTS : RESULTANT OF DISPLACEMENT

  49. RESULTS : AERAULICS AROUND THE CHUTE

  50. STUDY 4 : TNT EXPLOSION IN A TUNNEL STUDY OF ASSOCIATED DEFORMATIONS

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