Dr. Hakan Osman Caldag

[email protected]

33 Neapolitan House, Joseph Terry Grove, YO23 1PY, York, UK

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Summary: A researcher with strong computational skills in modelling the swimming of microorganisms and artificial microrobots at low Reynolds numbers, spanning across individual and collective dynamics. Experimental expertise that combines a vast array of disciplines to complement modelling work. Substantial experience in teaching assistance for undergraduate and graduate courses across all levels with diverse teaching methodologies.

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Past Work Experience

Feb 2022 – Ongoing

Postdoctoral Research Associate, Department of Mathematics, University of York, UK: Modelling and experiments on the dispersion of swimming algae in fluids, working with Prof. Martin Bees. Teaching assistance, holding seminars for undergraduate courses.

Feb 2021 – Feb 2022

Postdoctoral Researcher, Sabanci University Nanotechnology Research and Application Center (SUNUM), Turkiye: Modelling work on platinum degradation of fuel cells in a TUBITAK (The Scientific and Technological Research Council of Turkiye) supported research project.

Oct 2020 – Feb 2021

Postdoctoral Researcher, Mechatronics Engineering Department, Sabanci University, Turkiye: Work on rolling and sliding of magnetically rotated spheres in confinement.

June 2013 – Aug 2013

Research Intern, École Polytechnique de Montréal, Canada: Required summer internship. Worked with Prof. Sofiane Achiche on a system engineering model of a robot vacuum.

Education

Sep 2016- Aug 2020

PhD in Mechatronics Engineering, Sabanci University, Turkiye. Stability, control and acoustic manipulation of magnetically actuated helical swimmers. Supervisor: Prof. Serhat Yesilyurt. GPA: 4.00/4.00.

Sep 2014 - Aug2016

MSc in Mechatronics Engineering, Sabanci University, Turkiye Characterization of trajectories of magnetically actuated microswimmers with helical tails in circular channels. Supervisor: Prof. Serhat Yesilyurt.  GPA 3.91/4.00.

Sep 2010 – June 2014

BSc in Mechatronics Engineering, Sabanci University, Turkiye Numerical analysis on flow fields around vertical axis wind turbines. GPA: 3.76/4.00.

Honors & Awards

June 2017 – Aug 2020

TUBITAK (The Scientific and Technological Research Council of Turkiye) BIDEB 2211 Fellowship (PhD): Awarded with full tuition waiver and monthly stipend for outstanding academic records and national postgraduate exam performance.

Sep 2016 – June 2017

PhD Scholarship, Sabanci University: Awarded with full tuition waiver and monthly stipend for outstanding academic records.

Sep 2014 – Aug 2016

MSc Scholarship, Sabanci University: Awarded with full tuition waiver and monthly stipend for outstanding academic records.

June 2014

3rd rank/Honors Degree in Mechatonics Engineering BSc, Sabanci University.

Sep 2010 – June 2014

BSc Honor Scholarship, Sabanci University: Awarded with full tuition waiver and additional benefits for outstanding performance in the national university examinations (ranking in top 0.2% among ~1.5 million).

Publications

Journal Articles

  1. Caldag, H. O., Bryant, N. & Bees, M. A. (under review) Active Taylor dispersion with Fourier methods: biased swimming cells with absorbing boundaries.
  2. Caldag, H. O. & Bees, M. A. (in press). Fine-tuning the dispersion of active suspensions with oscillatory flows. Philosophical Transactions of the Royal Society A.
  3. Fung, L., Caldag, H. O. & Bees, M. A. (in press) Foundation and challenges in modelling dilute active suspensions. Philosophical Transactions of the Royal Society A.
  4. Malekabadi, F., Caldag, H. O. & Yesilyurt, S. (2023). Acoustic radiation forces and torques on elastic micro rings in standing waves. Journal of Fluids and Structures 118, 103841. https://doi.org/10.1016/j.jfluidstructs.2023.103841
  5. Shojaeian, M., Caldag, H. O., Bozkurt, A. & Yesilyurt, S. (2022). Fabrication of magnetic helical microribbons made of nickel thin films sandwiched between silicon nitride layers for microswimming applications. Nanotechnology, 34, 015301. https://doi.org/10.1088/1361-6528/ac9530
  6. Caldag, H. O., Demir, E. & Yesilyurt, S. (2022). A numerical and experimental investigation of rolling and sliding motion of rotating spheres inside a cylinder. Journal of Fluid Mechanics. https://doi.org/10.1017/jfm.2021.1144
  7. Caldag, H. O. & Yesilyurt, S. (2020). Acoustic Radiation Forces on Magnetically Actuated Helical Swimmers (promoted as Editor’s Pick). Physics of Fluids, 32, 092012 https://doi.org/10.1063/5.0020930
  8. Caldag, H. O., & Yesilyurt, S. (2019). Trajectories of magnetically-actuated helical swimmers in cylindrical channels at low Reynolds numbers. Journal of Fluids and Structures, 90, pp. 164-176. https://doi.org/10.1016/j.jfluidstructs.2019.06.005
  9. Caldag, H. O., Acemoglu, A., & Yesilyurt, S. (2017). Experimental characterization of helical swimming trajectories in circular channels. Microfluidics and Nanofluidics, 21(8). http://doi.org/10.1007/s10404-017-1973-9

Conference Papers

  1. Caldag, H. O. & Yesilyurt, S. (2020). A Simple Numerical Tool for the Evaluation of Acoustic Radiation Force on Helices. In: International Ultrasonics Symposium (IUS 2020), Las Vegas, Nevada https://doi.org/10.1109/IUS46767.2020.9251472
  2. Caldag, H. O. & Yesilyurt, S. (2020). Steering control of magnetic helical swimmers in swirling flows due to confinement. In: International Conference on Robotics and Automation (ICRA 2020), Paris, France. https://doi.org/10.1109/ICRA40945.2020.9196521
  3. Caldag, H. & Yesilyurt, S. (2018) Dynamics of Artificial Helical Microswimmers Under Confinement. ASME. International Conference on Nanochannels, Microchannels, and Minichannels, ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels ():V001T13A001. http://doi.org/10.1115/ICNMM2018-7632.

Conference Proceedings

  1. Caldag, H. O., Bryant, N. & Bees, M. A. (2024). Active matter dispersion with absorbing boundaries: Fourier methods to the rescue In: 65th British Applied Mathematics Colloquium.
  2. Yesilyurt, S., Shojaeian, M. & Caldag, H. (2023). Manufacturing and near wall swimming of helical thin magnetic ribbons. In: 76th Annual Meeting of the APS Division of Fluid Dynamics, Washington, DC.
  3. Yesilyurt, S., Shojaeian, M. & Caldag, H. O. (2022). Near wall swimming of helical ribbons. IUTAM Symposium: From Stokesian Suspension Dynamics to Particulate Flows in Turbulence
  4. Malekabadi, F., Caldag, H. O., & Yesilyurt, S. (2021). Acoustic radiation forces and torques on compressible micro rings in standing waves. In: 74th Annual Meeting of the APS Division of Fluid Dynamics, Phoenix, Arizona.
  5. Caldag, H. O., Demir, E. & Yesilyurt, S. (2021) A Numerical Investigation Of Rolling and Sliding Motion of Spheres in Confinement. In: 74th Annual Meeting of the APS Division of Fluid Dynamics, Phoenix, Arizona.
  6. Caldag, H. O. & Yesilyurt, S. (2018). Stability of helical microswimmers under confinement. In: 71st Annual Meeting of the APS Division of Fluid Dynamics, Atlanta, Georgia.
  7. Caldag, H. O., & Yesilyurt, S. (2016). Trajectories of artificial microswimmers with helical tails inside circular channels. In: 69th Annual Meeting of the APS Division of Fluid Dynamics, Portland, Oregon
  8. Caldag, H. O., & Yesilyurt, S. (2015) Position and trajectories of helical microswimmers inside circular channels*.* In: 68th Annual Meeting of the APS Division of Fluid Dynamics, Boston, Massachusetts

Teaching

Teaching Assistance

Held active and passive recitations, graded assignments and exams for the following courses:

Freshman

Calculus I: Basic functions, limits, derivatives, definite integral, improper integrals.

Introduction to Applied Mathematics: Kinematical concepts, equations of motion, conservation laws, motion in polar coordinates.

Sophomore

Mechanics: Equilibrium of particles and rigid bodies, centroid, friction, stress.

Junior

Mechanical Systems II: Design of bolts, bearings, gears, shafts; creep, yield and fracture.

Fluid Dynamics: Fluid statics, kinematics, conservation laws, boundary layers, modelling.

Classical and Biological Fluid Dynamics: Inviscid flows and complex variable formalism, Stokes flow, resistive force theory.

Graduate

Computational Analysis and Simulation: Numerical methods for root finding, solving linear system of equations, ordinary and partial differential equations.

Introduction to Scientific Computing: Error analysis, roots of nonlinear equations, interpolation, numerical methods for solving systems of linear equations and differential equations, numerical integration.

Renewable and Sustainable Energy Systems: Engineering thermodynamics review, fluid mechanics of wind energy generation, solar panels, nuclear energy, economic analyses.

Mentoring

Supervised four undergraduate students during their summer research internships at Sabanci University. Helped them carry out experiments on acoustic actuation of microparticles in fluids and 3-dimensional printing of helical swimming microrobots.

Training

Participated in training sessions at Sabanci University: Pedagogical Approach, Teaching Education, Scientific & Academic Development in Engineering.

Skills

Software MATLAB, COMSOL Multiphysics, C++, Simulink, LaTeX, Solidworks, NI LabVIEW.

Language      Turkish (Native), English (Advanced).

Technical Clean room experience (PVD, PECVD, lithography), culturing microorganisms (hazard level 1).