I am Dr. Richard Semaan. I am head of the flow modelling and control group and the academic council (Akademisher Rat) at the institute of fluid mechanics at the Technische Universität Braunschweig. This is my professional website to keep all my friends, collaborators, and all those who are interested in active flow control, reduced-order modeling, and machine-learning updated on my work. Feel free to look around.

My contact information:

Dr. Richard Semaan

Technische Universität Braunschweig

Institute of Fluid Mechanics

Office 117
Hermann-Blenk-Str. 37
38108 Braunschweig

Tel: +49 531391 94258+49 531391 94258
Fax: +49 531391 94254

Email: please use the Email Tool below

Instructions for visitors:

• Airports: Braunschweig, Hannover or Berlin.
• Train to Braunschweig Hauptbahnhof: See http://www.bahn.de.
• Bus 436 from Hauptbahnhof to Institute of Fluid Mechanics, direction "Flughafen". The bus stops at "Luftfahrtbundesamt" which is directly at the entrance of the Institute. During daytime, the bus leaves the Hauptbahnhof at "n:26" and "n:56" and takes about 30 minutes. Details: http://www.verkehr-bs.de

Publications

a) Reviewed publications

1. Fernex D., Noack B. R. , Semaan R. Cluster-based network modeling - automated robust modeling of complex
   dynamical systems. In revision in Science Advances, 2021.

2. Pierzyna M., Burzynski D. A., Bansmer S. E., Semaan R. Data-driven splashing threshold model for drop impact on
   dry smooth surfaces. In review in Journal of Fluid Mechanics, 2020.

3. Shaqarin T., Oswald P., Semaan R., Noack B. R. Drag reduction of D-shaped bluff-body using linear parameter
   varying control. In revision in Physics of Fluids, 2020.

4. Benjamin Herrmann B., Baddoo P. J., Semaan R., Brunton S. L., McKeon B.J. Data-driven resolvent analysis. In review
   in Journal of Fluid Mechanics, available on arxiv.org/abs/2010.02181, 2020.

5. Li H.,Fernex, D.,Semaan R.,Tan J., Morzyński M., Noack B.R. Cluster-based network model. Journal of Fluid Mechanics
   906, 2021.

6. Semaan R., The uncertainty of the experimentally-measured momentum coefficient: Guidelines on how to accu-
   rately estimate Cμ. Experiments in Fluids (In print), 2020.

7. Herrmann H., Oswal P., Semaan R., Brunton S. L., Modeling synchronization in forced turbulent oscillator flows.
   Nature Communications Physics (In print), 2020.

8. Semaan R., El Sayed M. Y., Loges S., Noack B. R., and Radespiel R., Active flow control experiments on a high-lift
   configuration. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Springer, 2020.
9. Semaan R., Yadav V., SCOUT: Signal Correction and Uncertainty Quantification Toolbox in MATLAB. SoftwareX, 11, 100474, 2020.
10. Fernex D., Semaan R., Albers M., Meysonnat P. S., Schröder W., Noack B. R., Self-Similar Turbulent Drag Reduction Formula from Sparse Data for Spanwise Traveling Surface Waves. Physical Review Fluids, 5, 073901, 2020.
11. Albers M., Meysonnat P. S., Fernex D., Semaan R., Noack B.R., Schröder W., Drag Reduction and Energy Sav- ing by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow. Flow Turbulence and Combustion, doi.org/10.1007/s1049, 2020.
12. Shaqarin T., Oswald P., Semaan R. and Noack B. R., Closed-Loop Drag Reduction over a D-Shaped Body via Coanda Actuation. Proceedings of the 5th Symposium on Fluid-Structure-Sound Interactions and Control, Crete, Greece, 2019.
13. Ishar R., Kaiser E., Morzynski M., Fernex D., Semaan R., Albers M., Meysonnat P. S., Schröder W., Noack B. R., Metric for Attractor Overlap. Journal of Fluid Mechanics, 874, 720–755, 2019.
14. Semaan R., El Sayed M. Y., Radespiel R., Sparse Model of the Lift Gains of a Circulation Control Wing with Unsteady Coanda Blowing. Active Flow and Combustion Control 2018, Springer, 3–18, 2018.
15. François D.G., Radespiel R., Semaan R., Numerical Investigations of Spanwise-Varied Unsteady Coanda Actuation on High-Lift Configuration. AIAA Journal of Aircraft, 55:4 1720–1730, 2018.
16. Semaan R., Optimal Sensor Placement using Machine Learning. Computers and Fluids, 159: 167–176, 2017.
17. El Sayed M. Y., Sattler S., Radespiel R., Semaan R., Wake Characterization behind a Circulation Control Wing.
    Experiments in Fluids 58:144, 2017.
18. Semaan R., Shape Optimization of Active and Passive Drag-Reducing Devices on a D-shaped Bluff Body. Notes on
    Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, 327–336, 2018.
19. El Sayed M. Y., Beck N., Kumar P., Semaan R., Radespiel R., Challenges in the Experimental Quantification of the Momentum Coefficient of Circulation Controlled Wings. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, 533–543, 2018.
20. Semaan R., Kumar P., Burnazzi M., Tissot G., Cordier L., and Noack B. R., Reduced-Order Modeling of the Flow around a High-Lift Configuration with Unsteady Coanda Blowing. Journal of Fluid Mechanics, 800: 72–110, 2016.
21. SemaanR.andNaughtonJ.W.,Three-ComponentLaser-Doppler-AnemometryMeasurementsinTurbulentSwirling Jets. AIAAJournal,51(9):2098–2113,2013.
22. Semaan R. and Scholz P., Pressure Correction Schemes and the Use of the Wiener Deconvolution Method in PneumaticSystemswithShortTubes. ExperimentsinFluids,53(3):829–837,2012.
23. Durgesh V., Semaan R., Naughton J. W., Revealing Unsteady Flow Structure from Flow Visualization Images. Euro- pean Physical Journal, Special Topics, 182, 2010.

b) Other publications

1. Fernex D., Weiner A., Noack B. R., Semaan R. Sparse Spatial Sampling: A mesh sampling algorithm for efficient
   processing of big simulation data. AIAA Paper (In preparation for SciTech), 2021.

2. Fernex D., Semaan R., Noack B. R. Generalized cluster-based network model for an actuated turbulent boundary
   layer. AIAA Paper (In preparation for SciTech), 2021.

3. Pohl J. and Semaan R., Quantification and modeling of dynamic lift on a DLR-F15 research airfoil with active
   trailing-edge flap. AIAA Paper 2020-0556, 2020.

4. Oswald P., Semaan R. and Noack B. R., Open- and Closed-Loop Control on a D-shaped Bluff Body Equipped with
   Coanda Actuation. AIAA Paper 2019-3601, 2019.

5. Fernex D., Semaan R., Albers M., Meysonnat P. S., Schröder W., Ishar R., Kaiser E. and Noack B. R., Cluster-Based Network Model for Drag Reduction Mechanisms of an Actuated Turbulent Boundary Layer. Proceedings in Applied Mathematics and Mechanics, 19(1), 2019.

6. Albers M., Meysonnat P. S., Fernex D., Semaan R., Noack B. R. and Schröder W., Parameter Study of Turbulent Drag Reduction by Spanwise Traveling Transversal Surface Waves. Proceedings in Applied Mathematics and Mechanics, 19(1), 2019.

7. El Sayed M. Y., Gomes de Paula N. C., Sedlacek D., Semaan R. and Radespiel R., Investigations into the Effects of Unsteady Blowing on the Wake of a Coanda Flap. AIAA Paper 2019-0587, 2019.

8. Pohl J., Semaan R. and Jones A. R., Dynamic Lift Measurements on an Airfoil with Periodic Flap Motion at High Reynolds Number. AIAA Paper 2019-1396, 2019.

9. ElSayedM.Y.,OswaldP.,SattlerS.,KumarP.,RadespielR.,BehrC.,SinapiusM.,PetersenJ.,WierachP,QuadeM., Abel M., Noack B. R. and Semaan R., Open- and Closed-Loop Control Investigations of Unsteady Coanda Actuation on a High-Lift Configuration. AIAA Paper 2018-3684, 2018.

10. El Sayed M. Y., and Semaan R. and Radespiel R., Sparse Modeling of the Lift Gains of a High-Lift Configuration with Periodic Coanda Blowing. AIAA Paper 2018-1054, 2018.

11. Kauth F., Seume J.R., Narjes G., Müller J. El-Sayed Y., François D.G., Semaan R., Behr C., Schwerter M., Leester- Schädel M., Nolte F., Kumar P., Giesecke D., Atalayer C., Srinivas V. and Müller T. Progress in Efficient Active High-Lift. AIAA Paper 2017-3559, 2017.

12. El Sayed M. Y., and Semaan R. and Radespiel R., Open Loop Control on a Coanda Flap Water Tunnel Model. AIAA Paper 2017-3247, 2017.

13. El Sayed M. Y., Semaan R. and Radespiel R., Open Loop Control on a Coanda Flap Water Tunnel Model. SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report, CFF - Forschungsbericht 2017-14.

14. Burnazzi M., Semaan R., El Sayed M. Y., and Radespiel R., Efficiency Improvements of a Coanda-Flap High-Lift Con- figuration. SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report, CFF - Forschungsbericht 2015-04.

15. Semaan R., El Sayed M. Y., Sattler S., Sultana K., Burnazzi M., Scholz P., and Radespiel R., A Generalized Reduced- Order Model of Flow around an Airfoil with Circulation Control. AIAA Paper 2014-2517, 2014.

16. Kumar P., El Sayed M. Y., and Semaan R., Optimized Sensor Placement using Stochastic Estimation for a Flow over a 2D Airfoil with Coanda Blowing. AIAA Paper 2014-2101, 2014.

17. Burnazzi M., Kumar P., Semaan R. and Radespiel R., Numerical Assessment of Two Periodic Actuation Approaches for Flow Separation Control. DLRK Kongress, Augsburg, 2014.

18. Semaan R., El Sayed M. Y., and Scholz P., An Experimental Setup to Study the Impact of Surface Disturbances on Boundary Layer Transition over a Transonic Laminar Wing Section. AIAA Paper 2013-2813, 2013.

19. Scholz P., El Sayed M. Y., Sattler S., Semaan R., Time-resolving PIV for Closed-Loop Flow Control: A Dedicated Experiment. 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics Lisbon, Portugal, July 2014.

20. El Sayed M. Y. and Semaan R. , Progress toward Closed Loop Control of a Flow around and Airfoil with Coanda Blowing. Proceedings of the International Conference on Instability and Control of Massively Separated Flows, ICOMASEF 2013, Prado Italy.

21. Semaan R. and Sattler S., Galerkin-Based Reduced Order Model of a Flow Around an Airfoil with Circulation Control. SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report, CFF - Forschungsbericht 2013-03.

22. Hahn D., Scholz P., Semaan R., Radespiel R. and Müller-Eigner, R., Erzeugung Definierter Querwirbel in einer Geschlossenen Messstrecke. 60. Deutscher Luft und Raumfahrkongress, Bremen, 2010.

23. Semaan R., Investigations of Swirling Jets. University of Wyoming Doctoral Dissertation, 2010.

24. Toutiaei S., Semaan R. and Naughton J. W., Reynolds Stress and Turbulence Kinetic Energy Balances in Swirling Jets. AIAA Paper 2010-105, 2010.

25. Semaan R., Naughton J. W., and Ewing D., Approach toward Similar Behavior of a Swirling Jet Flow. AIAA Paper 2009-1114, 2009.

26. Semaan R. and Naughton J. W., Initial Assessment of Three Component LDA Measurements for Swirling Jets. AIAA Paper 2008-0761, 2008.

27. Semaan R., Naughton J. W., Riotto B and Gilchrist R. T., Measurements in the Near Field of a Swirling Jet Using CTA, LDA, and PLS. AIAA Paper 2007- 52, 2007.

c) Books & book chapter

1. Semaan R., Fernex D., Weiner A., Noack B.R., xROM : A Toolkit for Reduced-Order Modeling of Fluid Flows, Machine Learning Tools in Fluid Mechanics. Technische Universität Braunschweig, https://doi.org/10.24355/dbbs.084- 202007011404-0, 2020.
2. Radespiel R. and Semaan R. (Editors), Fundamentals of High Lift for Future Civil Aircraft. Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer, Online ISBN 978-3-030-52429-6, 2020.
3. Noack N. B., Fernex D., and Semaan R. Machine Learning for Reduced-Order Modeling. VKI lecture series on Machine Learning for Fluid Mechanics: Analysis, Modeling, Control and Closures, 24–28 Feb., 2020.
4. Dillmann A., Heller G., Krämer E., Wagner C., Bansmer S., Radespiel R. and Semaan R. (Editors), New Results in Numerical and Experimental Fluid Mechanics XI. Notes on Numerical Fluid Mechanics and Multidisciplinary Design Springer, 2017.
5. Radespiel R. and Semaan R. (Editors), SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report. CFF-Forschungsbericht2017-14,2017.
6. Radespiel R. and Semaan R. (Editors), SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report. CFF-Forschungsbericht2015-04,2015.
7. Radespiel R. and Semaan R. (Editors), SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report. CFF-Forschungsbericht2013-03,2013.

d) Software

1. Semaan R. and Yadav, V., Signal COrrection and Uncertainty quantification Toolbox: SCOUT. Available under:
   https://github.com/rsemaan and www.richardsemaan.com/home/software/, 2019.
2. Noack, B. R., Fernex, D. and Semaan R., xROM - a Toolkit for Reduced Order Modelling of Fluid Flows (version 1.0).
   Available under: www.richardsemaan.com/home/software/, 2017.
3. Weiner, A. and Semaan R., flowTorch - a Python library for analysis and reduced order modeling of fluid flows. In
   testing. Expected release: December 2020.