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. Semaan R., The uncertainty of the experimentally-measured momentum coefficient: Guidelines on how to accurately estimate Cμ, in review in Experiments in Fluids, 2020.
2. Herrmann H., Oswal P., Semaan R., Brunton S. L., Modeling synchronization in forced turbulent oscillator flows.
   In review in Nature Communications Physics, available under https://arxiv.org/abs/2001.12000 2020.
3. Semaan R., El Sayed M. Y., Loges S., Noack B. R., and Radespiel R., Active flow control experiments on a high-lift configuration. Accepted for publication in Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Springer, 2020.
4. Semaan R., Yadav V., SCOUT: Signal Correction and Uncertainty Quantification Toolbox in MATLAB. SoftwareX, 11,100474, 2020.
5. 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.
6. Albers M., Meysonnat P. S., Fernex D., Semaan R., Noack B.R., Schröder W., Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow. Flow Turbulence and Combustion, doi.org/10.1007/s1049, 2020.
7. Shaqarin T., Oswald P., Semaan R. and Noack B. R., Closed-Loop Drag Reduction over a D-Shaped Body via Coanda Actuation. Submitted to Proceedings of the 5th Symposium on Fluid-Structure-Sound Interactions and Control, Crete, Greece, 2019.
8. 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.
9. 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.
10. 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.
11. Semaan R., Optimal Sensor Placement using Machine Learning. Computers and Fluids, 159: 167–176, 2017.
12. El Sayed M. Y., Sattler S., Radespiel R., Semaan R., Wake Characterization behind a Circulation Control Wing. Experiments in Fluids 58:144, 2017.
13. Semaan R., Shape Optimization of Active and Passive Drag-Reducing Devices on a D-shaped Blu Body. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, 327–336, 2018.
14. El Sayed M. Y., Beck N., Kumar P., Semaan R., Radespiel R., Challenges in the Experimental Quantification of the Momentum Coecient of Circulation Controlled Wings. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, 533–543, 2018.
15. 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.
16. SemaanR.andNaughtonJ.W.,Three-ComponentLaser-Doppler-AnemometryMeasurementsinTurbulentSwirling Jets. AIAAJournal,51(9):2098–2113,2013.
17. Semaan R. and Scholz P., Pressure Correction Schemes and the Use of the Wiener Deconvolution Method in PneumaticSystemswithShortTubes. ExperimentsinFluids,53(3):829–837,2012.
18. Durgesh V., Semaan R., Naughton J. W., Revealing Unsteady Flow Structure from Flow Visualization Images. European Physical Journal, Special Topics, 182, 2010.

b) Other publications

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. ElSayed M.Y.,Oswald P., Sattler S., Kumar P., Radespiel R., Behr C., Sinapius M., Petersen J., Wierach P, Quade M., 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. Burnazzi M., Semaan R., El Sayed M. Y., and Radespiel R., Eciency Improvements of a Coanda-Flap High-Lift Configuration. SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report, CFF - Forschungsbericht 2015-04.
13. 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.
14. 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.
15. Burnazzi M., Kumar P., Semaan R. and Radespiel R., Numerical Assessment of Two Periodic Actuation Approaches for Flow Separation Control. DLRK Kongress, Augsburg, 2014.
16. 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.
17. 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.
18. El Sayed M. Y. and Semaan R. , Progress toward Closed-Loop Control of a Flow around an Airfoil with Coanda Blowing. Proceedings of the International Conference on Instability and Control of Massively Separated Flows, ICOMASEF 2013, Prado Italy.
19. SemaanR.andSattlerS.,Galerkin-BasedReducedOrderModelofaFlowAroundanAirfoilwithCirculationControl. SFB 880 – Fundamentals of High-Lift for Future Commercial Aircraft, Biennial Report, CFF - Forschungsbericht 2013-03.
20. Hahn D., Scholz P., Semaan R., Radespiel R. and Müller-Eigner, R., Erzeugung Denierter Querwirbel in einer Geschlossenen Messstrecke. 60. Deutscher Luft und Raumfahrkongress, Bremen, 2010.
21. Semaan R., Investigations of Swirling Jets. University of Wyoming Doctoral Dissertation, 2010.
22. Toutiaei S., Semaan R. and Naughton J. W., Reynolds Stress and Turbulence Kinetic Energy Balances in Swirling Jets.
    AIAA Paper 2010-105, 2010.
23. Semaan R., Naughton J. W., and Ewing D., Approach toward Similar Behavior of a Swirling Jet Flow. AIAA Paper
    2009-1114, 2009.
24. Semaan R. and Naughton J. W., Initial Assessment of Three-Component LDA Measurements for Swirling Jets. AIAA
    Paper 2008-0761, 2008.
25. 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, in 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), Notes on Numerical Fluid Mechanics and Multidisciplinary Design: Fundamentals of High Lift for Future Civil Aircraft (in preparation). Springer, 2020.
3. Noack N. B., Fernex D., and Semaan R. Machine Learning for Reduced-Order Modeling. In 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: Contributions to the 20th STAB/DGLR Symposium Braunschweig, Germany,2016. 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:
   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.