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http://www.itk.ntnu.no. A Simulation Framework for Testing Flow Control Strategies. Marek Gayer, Milan Milovanovic and Ole Morten Aamo Faculty of Information Technology, Mathematics and Electrical Engineering Department of Engineering Cybernetics
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http://www.itk.ntnu.no A Simulation Framework for Testing Flow Control Strategies Marek Gayer, Milan Milovanovic and Ole Morten Aamo Faculty of Information Technology,Mathematics and Electrical Engineering Department of Engineering Cybernetics The 18th IASTED International Conference on Applied Simulation and Modelling ~ASM 2009 September 7 – 9, 2009Palma de Mallorca, Spain
Introduction 1/2: Flow control of vortex shedding around 2D cylinder
Introduction 2/2: Flow control with suction/blowing actuation slots
Simulation framework architecture Simulation case Grid Navier-Stokes solver and data VISTA withDiffpack Actuation --- Feedback Utility library Flow control module Post-processing Results
Code VISTA – CFD/N-S solver • Finite element method based incompressible Navier-Stokes solver • C++, using Diffpack numerical package • VISTA menu system reads parameters from extendible input case files • Additional parameters provided in files • Support for computational grids, VTF data sets, restarting simulations
Flow control modules • Realizes simulation of a flow controller • Reads data for a control case • Reads variables from N-S CFD code • Implement a controller computation • Applies computed values back to N-S • Output results to files • Implemented as inherited C++ classes
Utility Library • Provides general functionality for Flow Control modules • Uses VISTA and Diffpack • Routines for real and complex matrix and vector classes • Reading and writing data files • Uses special .m files for input/output
Case study: Control of vortex shedding around cylinders with G-L • Simplified Ginzburg-Landau equation • for , with boundary conditions and • Stabilizing state feedback controller:
Stabilization of fully developed vortex shedding; Re=60 (GL Inova)
Monitoring of simulation control related parameters in MATLAB
Conclusion • Simulation Framework for incompressible fluid flow control featuring: • CFD code VISTA (Navier-Stokes based) • Flow Control Module(s) • Utility Library • Input cases with grid input files • Results visualized/real time monitored in MATLAB and GL Inova • Case study removes vortex sheddding;Re=60
Possible future effort • Extend to work with the output feedback problem, for the G-L eq. in [Aamo2007] • Try for Re > 60 • Develop simulation cases and modules for 3D control of fluid flows • Implement parallel processing
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