3DS.COM Dassault Systèmes 4/24/2018 ref.: 3DS_Document_2017 Wind and Drivetrain Applications using SIMULIA XFlow LBM 4th Wind and Drivetrain Conference Hamburg, April 19 th 2018 Zaki Abiza XFlow Business Development zaki.abiza@3ds.com
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 2
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 3
Simulation value SIMULIA CFD Strategy LBM for simulations beyond physical tests SIMULIA Lattice-Boltzmann SIMULIA Navier-Stokes High fidelity Steady state & Low unsteady flow Fidelity 4
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 5
Numerical Scheme Lattice-Boltzmann Method Macroscopic variables are statistical moments of the particle distribution function (f) Particles streaming Collision operator with a unique XFlow collision operator in central moments space f = f (x,v,t) 27 velocity directions in 3D Density Linear momentum Structure D3Q27 6 6
Discretization Scheme Lattice Structure Set of 27 PDF at each lattice nodes, Data stored in Octree structure Generated based on input resolved scale and geometries Supports multi-resolution Adaptive & dynamic refinement: wake, moving parts, free surface interface Lattice structure illustration Far Field = 1.28 m Walls = 0.005 m Wake = 0.01 m Far field scale = h Near walls scale = h/4 7
Turbulence Model Large-Eddy simulation (LES) Boundary layer modeling: generalized law of the wall Turbulence modeling: Wall-Modelled LES (WMLES) 8
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 9
Wind Turbine Dynamics Real rotating blades at real scale Wake adaptive refinement 10
Wind Turbines Field Flow interaction between different wind turbines 11
Vertical Axis Wind Turbines (VAWT) VAWT starting characteristics 12
Parts Separation Parts breaking and trajectory 13
Parts Separation Ice detachment and trajectory 14
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 15
Drivetrain Lubrication 3-gear elements drivetrain 16
Drivetrain Lubrication Chain driven gears 17
Simple Gear Lubrication Drivetrain lubrication and thermal analysis 18
Content Introduction Numerical Methodology Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 19
60 m 138 m Offshore Wind Turbine Tower Case study: Wind effect on the flow around an offshore wind turbine tower Water level at Y = 0 m Submerged part: 60 m Water velocity: Wind velocity: 10 [m/s] for Y < 0 m 20 [m/s] for Y > 0 m Water surface 3 configurations: 1. Free Surface flow: no wind, only water 2. Multiphase flow: water and fixed wind 3. Multiphase flow: water and wind sweep Velocity law: X: 20*cos(ω*t) [m/s] Y: 0 [m/s] Z: 20*sin(ω*t) [m/s] 20
Offshore Wind Turbine Tower Case study: Wind effect on the flow around an offshore wind turbine tower Water level at Y = 0 m Submerged part: 60 m Water velocity: Wind velocity: 10 [m/s] for Y < 0 m 20 [m/s] for Y > 0 m 3 configurations: 1. Free Surface flow: no wind, only water 2. Multiphase flow: water and fixed wind 3. Multiphase flow: water and wind sweep Velocity law: X: 20*cos(ω*t) [m/s] Y: 0 [m/s] Z: 20*sin(ω*t) [m/s] Water velocity 21
Offshore Wind Turbine Tower Free-surface flow: No wind effect, only water simulated 22
Offshore Wind Turbine Tower Case study: Wind effect on the flow around an offshore wind turbine tower Water level at Y = 0 m Submerged part: 60 m Wind velocity Water velocity: Wind velocity: 10 [m/s] for Y < 0 m 20 [m/s] for Y > 0 m 3 configurations: 1. Free Surface flow: no wind, only water 2. Multiphase flow: water and fixed wind 3. Multiphase flow: water and wind sweep Velocity law: X: 20*cos(ω*t) [m/s] Y: 0 [m/s] Z: 20*sin(ω*t) [m/s] Water velocity 23
Offshore Wind Turbine Tower Multiphase flow: Effect of the wind on the free-surface of water 24
Offshore Wind Turbine Tower Free-surface flow Multiphase flow More perturbations on water surface with multiphase flow Lower frontal water elevation with multiphase flow 25
Offshore Wind Turbine Tower Case study: Wind effect on the flow around an offshore wind turbine tower Water level at Y = 0 m Submerged part: 60 m Wind sweep Water velocity: Wind velocity: 10 [m/s] for Y < 0 m 20 [m/s] for Y > 0 m 3 configurations: 1. Free Surface flow: no wind, only water 2. Multiphase flow: water and fixed wind 3. Multiphase flow: water and wind sweep Velocity law: X: 20*cos(ω*t) [m/s] Y: 0 [m/s] Z: 20*sin(ω*t) [m/s] Water velocity 26
Offshore Wind Turbine Tower Multiphase flow: Wind direction effect on the water wake 27
Summary The main wind and drivetrain applications of SIMULIA XFlow: Wind Turbine Aerodynamics Drivetrain Lubrication Offshore Wind Turbines 28
Danke! Zaki Abiza XFlow Business Development zaki.abiza@3ds.com 29