Camila Chovet Laurent Keirsbulck Bernd. R. Noack
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1 Camila Chovet Laurent Keirsbulck Bernd. R. Noack Marc Lippert Jean-Marc Foucaut Lyon, 2016 November 28
2
3 INTRO 1 Bombardier Toyota LAMIH Alstom MCA PSA Railway industry employees 1 st European region for railway 4 International manufacturers leaders 1 Billion euros sales revenue Car industry employees 1 st French region for car industry 3 Cars Manufacturers Vehicles 7 production plants Logistics employees 3 rd French region for logistics 1 st French harbor platform (Boulogne, Calais, Dunkerque) m 2 Last generation warehouses
4 INTRO 1 Bombardier Toyota LAMIH Alstom MCA PSA Railway industry employees 1 st European region for railway 4 International manufacturers leaders 1 Billion euros sales revenue Car industry employees 1 st French region for car industry 3 Cars manufacturers vehicles 7 production plants Logistics employees 3 rd French region for logistics 1 st French harbor platform (Boulogne, Calais, Dunkerque) m 2 Last generation warehouses
5 INTRO 2 Problem: Increase base pressure - Flow structure 35 d inclinaison U Flapping shear layer Kelvin- Helmholtz & pairing Oscillation of recirculation bubble - Physics of control strategies Boundary layer separation (Recirculation bubble) Longitudinal vortices - Methods of flow control Passive control (Small variation in the geometric configuration) Limitations of design requirements Active control (Injection of momentum)
6 INTRO 2 Problem: Increase base pressure - Flow structure 35 d inclinaison U Flapping shear layer Kelvin- Helmholtz & pairing Oscillation of recirculation bubble - Physics of control strategies Boundary layer separation (Recirculation bubble) Longitudinal vortices - Methods of flow control Passive control (Small variation in the geometric configuration) Limitations of design requirements Active control (Injection of momentum)
7 INTRO 3 Active control of the turbulent flow downstream of a backward facing step with dielectric barrier discharge plasma actuators. Patricia Garrido (2014) Thesis work Re H X r /X ro 1. Fence 2. Loudspeaker 3. DBD plasma 4. Oscillating flap 5. Loudspeaker 6. Synthetic jet 7. Wake generator 8. Suction/blowing 9. Flapping foil 10. Permeable surface % 15% 20% - 65% 20% 89% 31% 30% 33%
8 SETUP 4 Activity fields: Land transport Aeronautics Civil engineering Environment Characteristics: Closed-loop wind tunnel Max. velocity 60m/s (200km/h) Optimal test vein: section 2m x 2m, length 10m
9 SETUP 5 H = 83mm
10 SETUP double frame pictures 7Hz repetition rate
11 SETUP 5 Dynamic characterization of row of piezoelectric micro-blowers for separated air flow control. C. Chovet et al. (2016) (Sensor and Actuators A: physical) Vol:249. pp
12 SETUP 6 Sensor Actuator 2cm 2cm Intake channel Nozzle (0.8mm) Diaphragm Piezoelectric element Pump - 25 static pressure sensors in parallel with - 25 sub-miniature piezo-resistive Kulite sensors Nominal measurement range of 35Kpa Sampling frequency 10KHz - Pulsed Jet (non-zero-net-mass-flux) - Combination of a disc-shaped piezoelectric element and a metal diaphragm (Vibrations 26 khz). - Air discharges up to 1 l/min. - Low Power Consumption.
13 NFORCED y/h y/h 7 Mean reattachment length (Lr) Critical parameter on separated and reattaching flows studies, e.g: Re H = x/h - Mean detachment - Time-averaged velocity close to the wall x/h - Transitory detachment - Forward flow probability (FFP) equal to 50% Aspects of turbulent boundary layer separation. (1996) Prog.Aerospace Sci
14 NFORCED 8 Re H δ/h ER L r /H U 0 = 5.7m/s - 33m/s Re H = δ/h = ER = 1.04
15 ERIODIC 9 Control law b = A Cos (wt)
16 ERIODIC y/h 10 x/h f f = f H/U o
17 MLC 11 Closed-Loop Turbulence Control: Progress and Challenges. B.R. Noack & S. Brunton (2014) Applied Mechanics Reviews
18 MLC 11 Closed-Loop Turbulence Control: Progress and Challenges. B.R. Noack & S. Brunton (2014) Applied Mechanics Reviews
19 MLC 12 Real-time loop (fast) Actuators b Sensors s Control law b=k(s) S1 Sn Machine Learning Control- Taming Nonlinear Dynamics and Turbulence T. Duriez et al. (2016) Springer Book 5
20 MLC 12 Real-time loop (fast) Actuators b Sensors s Tree configuration Control law b=k(s) S1 Sn b = cos S 1 tanh(0.2) Machine Learning Control- Taming Nonlinear Dynamics and Turbulence T. Duriez et al. (2016) Springer Book 5
21 MLC 12 Real-time loop (fast) Actuators b Sensors s Cost J Control law b=k(s) S1 Objective: minimize J Sn Learning loop (slow) Genetic Programming J 1 < J 2 < < J n Machine Learning Control- Taming Nonlinear Dynamics and Turbulence T. Duriez et al. (2016) Springer Book 5
22 MLC 13 b 1 1 = K 1 1 J 1 1 Elitism b 1 2 = K 1 2 J 1 2 b i 1 = K i 1 J i 1 Tournament Crossover Replication b i 2 = K i 2 J i 2 b n 1 = K n 1 J n 1 Mutation b n 2 = K n 2 J n 2 e.g. b = H(s 3 exp s ) b 1 = H(s 3 exp s ) b 2 = H(s 3 exp s ) b 1 = H(s 3 exp s ) b 2 = H(s 3 exp s ) b 1 = H( s 9 + ) b 2 = H( s 9 + ) b i 1 = H( + 0.8) b k 2 = H( + 0.8) b j 1 = H(tanh 0.1) b l 2 = H(tanh 0.1) Closed-Loop Turbulence Control: Progress and Challenges. B.R. Noack & S. Brunton (2014) Applied Mechanics Reviews
23 MLC LC 14 Control law
24 SETUP MLC 15
25 MLC 16
26 MLC y/h y/h y/h x/h y/h y/h 17 J = L r E + γ < b > Multi-frequency forcing - 12 generations individuals Non-autonomous feedback Optimal periodic forcing x/h Senosor-based feedback x/h Benchmark x/h x/h
27 RESULTS 18 Recirculation area (Ar) Internal recirculation length (Xr) External recirculation length (Lr)
28 RESULTS 19
29 RESULTS 20 BFS: Unforced and periodic forcing flows simulation David Uystepruyst & François Beaubert Cluster reduce order model (CROM) Eurika Kaiser SIMO MIMO MLC (LGPC) Bernd Noack, Ruiying Li Active flow control strategies LAMIH Automatic department (ARI project) Pulsed jet (coanda effect) Ahmed body ( SIMO & MIMO MLC) Bernd Noack, Ruiying Li & Eurika Kaiser Real car active flow control Bernd Noack, Ruiying Li & Eurika Kaiser
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