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Finite element analysis of elastic solid/Stokes flow interaction problem
황욱렬,명진석,원호윤,안경환,이승종 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.4
We performed a numerical investigation to find out the optimal choice of the spatial discretization in thedistributed-Lagrangian-multiplier/fictitious-domain (DLM/FD) method for the solid/fluid interaction prob-lem. The elastic solid bar attached on the bottom in a pressure-driven channel flow of a Newtonian fluidbetween flexible bodies and fluid. A fixed regular rectangular discretization was applied for the descriptionof solid and fluid domain by using the fictitious domain concept. The hydrodynamic interaction betweensolid and fluid was treated implicitly by the distributed Lagrangian multiplier method. Considering a sim-plified problem of the Stokes flow and the linearized elasticity, two numerical factors were investigated toclarify their effects and to find the optimum condition: the distribution of Lagrangian multipliers and theand a pseudo-time step test. We found that the fluid stress in a fictitious solid domain can be neglected andthat the Lagrangian multipliers are better to be applied on the entire solid domain. These results will be usedto extend our study to systems of elastic particle in the Stokes flow, and of particles in the viscoelastic fluid.
박준동,안경현,명진석 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
Colloidal dispersions have attracted much attention both from academia and industry due to industrial significance and complex dynamic properties. Accordingly, a variety of attempts have been made to understand the complicated physics of colloidal dispersions. Particle dynamics simulation has been playing an important role in exploring colloidal systems as a strong complement to experimental approaches from which it is hard to get exact microscopic information. Our aim is to provide a well-organized and up-to-date guide to particle dynamics simulation of colloidal dispersions. Among diverse particle dynamics simulation techniques, we focus on Brownian dynamics, Stokesian dynamics, multi-particle collision dynamics, and self-consistent particle simulation techniques. First, the concept of the simulation techniques will be described. Then, for each simulation technique, pros and cons are discussed with a broad range of applications, including concentrated hard sphere suspensions and biological systems. It is expected that this article helps to identify and motivate research challenges.