Hangjie Ji bio photo

Hangjie Ji

I'm from Hangzhou, China. Currently in Los Angeles, USA. Passionate about mathematics and technology.


Me in a Nutshell

I am an Assistant Adjunct Professor for the Program in Computing at UCLA Department of Mathematics working as a postdoc of Professor Andrea Bertozzi. I completed my Ph.D. in Mathematics at Duke University under the guidance of Professor Thomas P. Witelski.

Current Teaching (Winter 2020)


  • Ph.D. in Mathematics , Duke University, 2012 - 2017
  • M.S. in Computer Science, Duke University, 2015 - 2016
  • B.S. in Mathematics, Zhejiang University, 2008 - 2012

Research Interests

Partial differential equations, fluid dynamics, scientific computing

Curriculum Vitae

You can download my complete CV here.

Publications and preprints

  1. Y. Dukler, H. Ji, C. Falcon, A. L. Bertozzi, A theory for undercompressive shocks in tears of wine. Submitted to Physical Review Fluids (2019). [Link]

  2. H. Ji, T. P. Witelski, Steady states and dynamics of a thin film-type equation with non-conserved mass. To appear in European Journal of Applied Mathematics (2019). [Link]

  3. A. Sadeghpour, Z. Zeng, H. Ji, N. D. Ebrahimi, A. L. Bertozzi, Y. S. Ju, Water vapor capturing using an array of traveling liquid beads for desalination and water treatment. Science Advances 5, no. 4 (2019): eaav7662. [Link]

  4. H. Ji, C. Falcon, A. Sadeghpour, Z. Zeng, Y. S. Ju, A. L. Bertozzi, Dynamics of thin liquid films on vertical cylindrical fibers. Journal of Fluid Mechanics 865 (2019): 303-327. [Link] [Video Link]

  5. H. Ji, L. Li, Numerical methods for thermally stressed shallow shell equations, Journal of Computational and Applied Mathematics (2018). [Link]

  6. H. Ji, T. P. Witelski, Instability and dynamics of volatile thin films, Physical Review Fluids 3, no. 2 (2018): 024001. [Link]

  7. Y. Gao, H. Ji, J. Liu, T. P. Witelski, A vicinal surface model for epitaxial growth with logarithmic free energy, Discrete & Continuous Dynamical Systems - B (2018): 1771-1784. [Link]

  8. X. Hu, Y. Li, H. Ji, A nodal-based finite element approximation of a phase field model for shape and topology optimization, Applied Mathematics and Computation (2018). [Link]

  9. H. Ji, T. P. Witelski, Finite-time thin film rupture driven by modified evaporative loss, Physica D: Nonlinear Phenomena, vol 342 (2017), pp. 1-15. [Link]

  10. Y. Gao, H. Ji, J. Liu, T. P. Witelski, Global existence of solutions to a tear film model with locally elevated evaporation rates, Physica D: Nonlinear Phenomena, vol 350 (2017), pp. 13-25. [Link]

  11. H. Ji, Thin films with non-conservative effects, PhD Dissertation, Mathematics, Duke University, 2017. [Link]

Papers in preparation:

  1. with A. Sadeghpour, N. D. Ebrahimi, C. Falcon, A. L. Bertozzi, Y. S. Ju, Thermally-driven coalescence in thin liquid film flowing down a fiber

  2. with A. Sadeghpour, A. L. Bertozzi, Y. S. Ju, Dynamics of fluid films flowing down a fibre influenced by nozzle geometry