AMS Seminar

Speaker Name: 
Changho Kim
Speaker Title: 
Postdoctoral Researcher
Speaker Organization: 
Lawrence Berkeley National Laboratory
Start Time: 
Monday, November 13, 2017 - 4:00pm
End Time: 
Monday, November 13, 2017 - 5:00pm

Stochastic Simulation Method for Reactive Microfluids under Thermal Fluctuations

One of the essential components needed for realistic simulation of microfluids is the inclusion of thermal fluctuations. Our approach, fluctuating hydrodynamics (FHD), adds fluctuations by incorporating random fluxes into diffusion processes. While this description dates back to Landau and Lifshitz, developing general formulations and corresponding numerical schemes beyond the linear approximation of weak fluctuations has been attempted only recently. Accurately modeling fluctuations is even more crucial for simulating a reactive microfluid due to the relatively small population of reactant chemical species and the Poisson character of reactions. In the first part of the presentation, I present a newly developed simulation method, which is designed to have good performance in the large Schmidt number regime (e.g. aqueous solutions). In the second part, using a simpler reaction-diffusion problem, I discuss how a FHD-based scheme is systematically constructed and analyzed. In the last part, I briefly discuss how the FHD approach can be justified from the microscopic viewpoint using molecular dynamics simulations.
Changho Kim is a postdoctoral researcher at the Lawrence Berkeley National Laboratory working under the advisement of John Bell. He received his Ph.D. in Applied Mathematics at Brown University under the supervision of George Karniadakis. Before this, He received his Ph.D. in Chemistry at Korea Advanced Institute of Science and Technology (KAIST). His current research focuses on developing stochastic multiscale simulation methodologies and improving underlying theoretical formulations in order to understand multiphysics phenomena involving complex fluids at micro and nano scales, which are commonly found in nanomaterial and biological systems.