Implementation of a Hybrid Navier-Stokes/Vortex Panel Method for ...

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Basic Hybrid CFD Flow Chart Initial Setup Read user input data files Generate polylines Compute helix Compute circulation Compute induced velocities Solve equations Output results file © 2008 GE All rights reserved. 10 Iteration Loop Note User Fortran routines shown in yellow
Computing Circulation in CFX • The circulation is computed on closed loops (polylines) that include all of the sources of vorticity – The circulation calculation is made for a number of spanwise positions along the blade • This calculation is updated every iteration using the current values of the velocity field • Polyline points are mapped to the closest mesh points – Velocity vector and gradient returned at mapped points • User Fortran provides capability to recover gradient operator – Use Taylor expansion to interpolate solution from mapped point (mp) to polyline point (pp) V pp = V mp + ∇V * dr • Circulation calculation requires parallel implementation – Simplest parallel implementation is sufficient, as the line integrals are 1D calculations: – Routines use CFX Flow Parallel message passing calls for parallel communication (as does rest of CFX solver) © 2008 GE All rights reserved. 11
Page 1 and 2: 2008 International ANSYS Conference
Page 3 and 4: Hybrid CFD for Wind Turbine Aero
Page 5 and 6: Hybrid CFD (cont’d) • Hybrid Na
Page 7 and 8: Goals for Hybrid CFD for Wind Turbi
Page 9: User Fortran Routines CFX provides
Page 13 and 14: Induced Velocities • The induced
Page 15 and 16: Computation of Induced Velocities
Page 17 and 18: Mesh Generation • The blade geome
Page 19 and 20: Generation of the polylines Screen
Page 21 and 22: NREL Validation Case • National R
Page 23 and 24: Sensitivity Study • Sensitivity s
Page 25 and 26: Future Work • Hybrid methodology
Page 27: Impact Hybrid CFD - Represents a un

Implementation of a Hybrid Navier-Stokes/Vortex Panel Method for ...

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