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Changho Kim

Postdoctoral Researcher, Computational Research Division


Contact Information

Changho Kim
1 Cyclotron Rd. Berkeley, CA 94720
Lawrence Berkeley National Laboratory
Mailstop: 50A-3111
Office: 50A-3136D

510-486-6900 (fax)

Email: ChanghoKim@LBL.gov
Homepage: ChanghoKim.info


I am a postdoctoral researcher (advisor: John B. Bell) in the Center for Computational Sciences and Engineering (CCSE) in the Computational Research Division (CRD) of the Computing Sciences Directorate at the Lawrence Berkeley National Laboratory.
☞ View my profile in Berkeley Lab CS Newsletter (10/2015)

Research

My current research at the Berkeley Lab focuses on developing stochastic multiscale simulation methodologies and improving theoretical formulations in order to understand multiphysics phenomena involving complex fluids at micro and nanoscales. More specifically, for reaction-diffusion systems and reactive microfluids, I have been developing numerical methods based on fluctuating hydrodynamics.

As a first step, I have developed efficient and robust numerical methods for stochastic reaction-diffusion systems, where the rigor of the master equation approach for reactions and the efficiency of the fluctuating hydrodynamics approach for diffusion are combined.

  • C. Kim, A. Nonaka, J.B. Bell, A.L. Garcia, and A. Donev, "Stochastic simulation of reaction-diffusion systems: A fluctuating-hydrodynamics approach", J. Chem. Phys. 146, 124110 (2017) [Link]
  • Highlight slide
  • Poster
  • Simulation code

In the second phase of the project, I have incorporated the stochastic mesoscopic chemistry description into the full fluctuating hydrodyanmics. The new method for reactive microfluids is constructed to efficiently simulate liquid systems, based on an isothermal multi-species Boussinesq approximation and an implicit treatment of viscous momentum dissipation. In addition, carefully designed numerical modifications are implemented to handle trace chemical species.

  • Highlight slide
  • C. Kim, A. Nonaka, J.B. Bell, A.L. Garcia, and A. Donev, "Fluctuating hydrodynamics of reactive microfluids", manuscript in preparation.
The animation below is my recent simulation result for the asymmetric fingering with the neutralization reaction.