RESEARCH
ONGOING PROJECTS
Drop splash on liquid film
Drop impact on wire
Falling multi-body into liquid pool
Droplet in shear flow with surfactant transportation
Filling box from top opening with liquid
Development and validation of computational methods that can be applied to general 3D multiphase problems
Very accurate modeling for surface tension dominant flow
Immersed stationary and moving (forced+FSI) solid object with full contact dynamics (advancing and receding angle)
Energy equation with phase change + species transport equation
Surfactant model with Marangoni effect
Non-Newtonian fluid + user specific body forces (coriolis, centrifugal etc)
Parallelization and optimization for massive distributed processing
Application to various engineering problems (drop collision, bubble rising, RT instability, Pool (film/nucleate) boiling, drop impact etc)
Joint project with CNRS
- Latest development
Deformable solid (Fluid-Solid interaction)
Flexible solid under external velocity
Regular surface
shear modulus (0.4 GPa)
advancing angle (100)
receding angle (80)
SHPo surface
shear modulus (0.4 GPa)
advancing angle (165)
receding angle (160)
Drop impact on flexible cantilever - application to energy harvesting system
Collision model for the moving solid (with fluid flow) - IMPULSE RESPONSE MODEL
restitution coefficient = 0
restitution coefficient = 0.5
restitution coefficient = 1.0
3 solids interaction (r.c. =1)
2 solids and 1 drop (r.c. =0)
complex system with drops and solids
User friendly input for complex physical problems
easy implementation of arbitrary initial velocity
3 drops impact with different initial velocity
heterogeneous surface properties
mixing hydrophilic + hydrophobic surface
2. Drop-particle interactions (developing detailed regime map)
3. Falling drop with surfactant transport (application to fine dust control)
4. Sound-controlled spatiotemporal patterns (related to faraday instability)
5. Characteristics of flow patterns in tandem cylinder (application of deep learning process)
PREVIOUS SELECTED PROJECTS
1. Numerical simulation of micro droplet condensation and jumping process with phase change on super-hydrophobic surface
Main objective of current research is to develop direct numerical simulation tool which can analyze entire process of jumping droplet on condensing surface. With devised numerical algorithm, we can understand the fundamental physics associated with droplet jumping process during phase change process, which will result in identifying key parameter for related condensation process. Multiphase flow simulation with more than one phase change will be necessary ingredient along with accurate modeling of surface tension including contact line dynamics. Phase transformation should be accounted precisely with appropriate interfaces advection scheme
2. Numerical investigation of BOW phenomenon in ultra thin silicon solar cell
In order to reduce the cost per watt of photovoltaic power generation, reducing the thickness of the crystalline silicon solar cell is a promising strategy. However, with a thinner silicon wafer, the bowing depth induced by two distinctive thermal expansion rates between the silicon substrate and the aluminum layer in the rear grows exponentially. In this study, we worked on developing an accurate numerical technique that can calculate the correct deformation of the bow, especially for an ultra-thin silicon solar cell with < 100 μm thickness.
3. Numerical simulation of particulated flow in solar thermal absorber (CSP)
We have developed numerical model for the particulated flow through narrow slit using Eulerian-Granular method. Commercial software (ANSYS FLUENT) was utilized as simulation tool and main foucs was to identify the effect from various numerical options modeling of solid particles as continuous phase in granular flow.