numerical modelling of mechanical coupling in fluids & structures software fluidyn - mp
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
-
NUMERICAL MODELLING OF MECHANICAL COUPLING IN FLUIDS & STRUCTURES
SOFTWARE fluidyn - MP
-
PRESENTATION OF fluidyn - MP
-
General : role & utility of Computational Fluid DynamicsA 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
-
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 for structures
Automatic exchange of boundary conditions between fluids & structures - Adaptative Fluid Mesh
Local time step used to reduce CPU time
-
3-DimensionsCompressible / incompressibleMechanical / thermal shocks Viscous / non-viscousLaminar / turbulentMulti-speciesMulti-phaseSolution of Navier-Stokes EquationsFluid Solver
-
Non-Newtonian Flows : Bingham lawPower law
Chemical combustion reactions Arrhenius modelEddy-break-up modelEddy dissipation model
Deflagration & fireBLEVEPool fire
DetonationJWL model
Two phase flows droplets, bubbles, particlesEuler-Lagrange Monte-Carlo, Free surface flow ( VOF method + CSF method)
Fluid Solver
-
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
Fluid SolverFree 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
Fluid SolverFree surface two phase 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.
Fluid SolverTwo 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
Fluid SolverTwo phase Euler / Lagrange flows
-
Algebraic ModelsBaldwin- LomaxMixing Length :Van Driest dampingAbbott & BushnellCebeci- SmithSub grid scale model SGS Two equations transport (k - e) & RNGReynolds stress model (anisotropic turbulence) TurbulenceFluid Solver
-
Perfect gasIdeal gasJWL (Jones - Wilkins - Lee) for explosionsLinear - polynomialUser defined
Equations of StateTemperature functionsUser defined
Viscosity & Prandtl numberFluid Solver
-
Spatial discretization schemesExplicit : Van Leer Flux Vector Splitting Roe Flux Difference Splitting 3rd order Advection Upwind Splitting, HLLCSemi- implicit : Weighted Upwind Scheme QSOU 2rd order Implicit : Central Difference Scheme 3rd order Flux Limiter Scheme (Van Leer, SMART, etc.)
Fluid Solver
-
Explicit :Time stepglobal minimum for transient simulations local for steady state simulationsconvergence acceleration Temporal Integration 6 step 2nd order Runge Kutta.
Implicit:Gauss-Seidel or Jacobi iterative methodssteady state calculation & low velocities.Temporal discretization schemeFluid 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
Structured solver
-
Structured Solver Small deformations & large displacements Finite Elements method
Large deformationsFinite Elements method
Finite Elements solversExplicit / implicit
Rayleigh damping
-
Boundary Conditions Transient or constant
Outside : at nodes : temperature, forces, displacementsat faces: pressure, volume forces
Imposed automatically in fluids & structures
Modelling displacement of fluid mesh with Updated Lagrangian methodStructured solver
-
Automatic simulation of convective & radiative heat transfer
Radiation modelsTransparent mediaAutomatic calculation of 3D view factors Shadow effect of intermediate obstaclesOpaque MediaSix-Flux modelDiscrete ordinate modelThermal analysisMaterial properties w.r.t temperatureConduction with Finite Elements method.Heat transfer modelling
-
Computation Procedure - 4 steps
-
Multi-block structured
Un-structured
Delaunay method2D & 3D meshesHybrid, tetrahedral or hexahedral mesh
Adaptative meshShocks, turbulent boundary layers, ..Refined mesh & automatic interpolation of the solution.
Interactive, simple & automaticComplex geometries
MeshPre - 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
AnimationsPost - processor
-
Fluidyn - MP : STUDY CASESFLUID STRUCTURE MECHANICAL INTERACTIONSDOOR OPENING UNDER FLUID PRESSUREFLAPGATE OPENING UNDER FLUID PRESSUREAEROSPACETOBOGGANTNT EXPLOSION TUNNEL (BOURGES)
-
fluidyn-FSIFLUID STRUCTURE INTERACTION
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
-
Calculation Procedure - 4 stepsfluidyn - FSI
-
STUDY 1 : OPENING OF A DOOR UNDER FLUID PRESSURE
-
TARED DOORDESCRIPTION
- Opening of a door under fluid pressure effect.- Modelling with the help of the software Fluidyn - FSI
Porte ----->Chambre 30 barfluidyn - FSI
-
RESULTANT OF DISPLACEMENT IN THE DOORfluidyn - FSI
-
DOOR DEFORMATION fluidyn - FSI
-
PRESSURE CONTOURfluidyn - FSI
-
PRESSURE CONTOUR fluidyn - FSI
-
PRESSURE CONTOURfluidyn - FSI
-
PRESSURE CONTOURfluidyn - FSI
-
STUDY 2 : OPENING OF A FLAPGATE UNDER THE EFFECT OF FLUID PRESSURE
-
fluidyn - FSI- 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
PROBLEM
-
GEOMETRY OF THE PROCESSfluidyn - FSI
-
DOMAIN MESHFluid = Finite Volumes Structure = Finite Elementsfluidyn - FSI
-
FLOW IN THE MEDIAN PLANEfluidyn - FSI
-
FLUID PRESSURE ON THE STRUCTUREfluidyn - FSI
-
FINAL STATEfluidyn - FSI
-
STUDY 3 : WIND RESISTANCE OF AN ESCAPE CHUTE
-
DESCRIPTION
Wind resistance of an escape chute submitted to a lateral wind of 25 nodesSimplified Case : isolation des arcs & the runways for the simulationsStructural Modelling with the help of finite elements of beam typeFluid Modelling (air) with the help of finite volumesResults searched for : deformations & maximum stressPRESENTATION
-
CHARACTERISTICS
Properties of the escape chute
E
4.58E+5 N/m2
0.3
5.7kg/m3
Properties of the arcs
E
4.58E+5 N/m2.
0.3
5.7 kg/m3
Physcial properties of air
Fluide
Incompressible
1.16924 kg/m3
Cp
1005 J.kg-1.K-1
Flow
Viscous
Viscosity:
1.895E-05 m2/s
Pr
0.72
Turbulence Model
k-
-
FLUID MESH
-
STRUCTURAL MESH
-
BOUNDARY CONDITIONS
-
RESULTS : DEFORMATIONS
-
RESULTS : DEFORMATIONS
-
RESULTS : RESULTANT OF DISPLACEMENT
-
RESULTS : AERAULICS AROUND THE CHUTE
-
STUDY 4 : TNT EXPLOSION IN A TUNNELSTUDY OF ASSOCIATED DEFORMATIONS
-
DESCRIPTION
TNT Explosion in a cylindrical section of a T tunneldimensions : diameter = 168 mm, lengths = 1.28 m & 1.50 m Tunnel walls in steel, thickness = 2 mmTNT Load of 18.5 g placed at the tunnel headResults searched for : propagation of detonation wave, final structural deformationPRESENTATION
-
GEOMETRY
-
JWL equation for TNT
Ideal gas for airMATHEMATICAL MODEL
-
JWL EQUATION COEFFICIENTS0= 1630 kg/ m3A= 3.71213E0= 7 GJ/m3B= 0.032306Pcj= 0.21 MbarR1= 4.15Dcj= 0.693 cm/sR2= 0.9cj= 0.3cj= 2.727
-
Elasticity Module = 210 GPaPoisson Coefficient= 0.3Density= 7850 kg/m3STEEL PROPERTIES
-
BOUNDARY CONDITIONS : FLUID
-
BOUNDARY CONDITIONS : STRUCTURE
-
FLUID MESH
-
STRUCTURAL MESH
-
Symmetry (in the Y direction perpendicular to the tunnel plane) : mesh reduced to half of the domain3D domain extended beyond the tunnel head in order to place the TNT charge3D Mesh48972 cells for the fluid9128 elements for the structure3D SIMULATION
-
RESULTS : PICS OF THE PRESSURE AT MONITOR POINTS
-
RESULTS : COMPARISON WITH EXPERIMENTAL RESULTS
-
RESULTS : PRESSURE WAVE PROPAGATION
-
RESULTS : DISPLACEMENT STRESS IN THE STRUCTURE
-
RESULTS : DEFORMED FINAL STATE OF THE STRUCTURE
-
UKSUTTON COLDFIELDFRANCELyonCHINABeijingJAPANTokyo