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비뉴턴유체 해석을 위한 Fully Implicit ISPH 모델 개발
신동빈(Dongbin Shin),김지환(Jihwan Kim),변제윤(Je-Yun Byun),주영석(Young-Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Highly viscous fluids are used in a wide range of applications such as natural disasters, computer graphics, and food industries, etc. Numerical approaches are mainly adopted to reproduce complex and nonlinear phenomena of highly viscous fluids. In this study, the fully implicit Incompressible Smoothed Particle Hydrodynamics (ISPH) model was developed to analyze highly viscous fluids, and the model was verified by comparing with the analytic solutions of Poiseuille flow and the experimental data of dam break. The proposed model can overcome the limitation of the large computational time interval that inevitably occur in the analysis of highly viscous fluids, so that it is expected that the model will be widely applicable to practical industries.
Hertz-Mindlin 접촉 모델이 적용된 음해적 입자법을 통한 다물체 충돌해석
이완기(Wan Ki Lee),김기덕(Gi Deok Kim),변제윤(Je Yun Byun),주영석(Young Suk Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Existing Smoothed particle hydrodynamics(SPH) structural analysis model has two problems: tensile instability resulting in particle clumping and the use of non-physical artificial stress. In this study, to solve the above two issues, the structural analysis is implemented with total Lagrangian based corotated SPH, and the Hertz-Mindlin contact model is applied as the interface condition for collision of multi-body. For numerical validation of structural analysis model, dynamic behavior simulation of cantilever beam is performed. Transient analysis of deflection at the cantilever beam tip is conducted, and maximum deflection and frequency are calculated and compared with finite element method(FEM) results and analytical solution. For numerical validation of collision model, transient analysis for reaction force between two elastic rings is performed. The stress distribution and deformation shape at specific time steps are compared with the FEM results.
Multi-GPU 기반 SPH에 대한 동적 부하분산 전략
김기덕(Gi-Deok Kim),이완기(Wan-Ki Lee),변제윤(Je-Yun Byun),주영석(Young-Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Graphics processing unit(GPU) has been developed as much research has been conducted on smoothed particle hydrodynamics(SPH). Therefore, many researchers developed a variety of particle methods based on GPU as well as studies on multi-GPU instead of single-GPU are conducted. One of most widely adopted load balancing algorithms is the fixed analysis area division. The fixed region load balancing algorithm has the advantage that the implementation of load balancing is not complicated, since the particle distribution is not necessary to be considered. However, in the case of a dynamic flow analysis as dam-break, there is a drawback that particles are not distributed evenly into each device. To solve this issue, this paper presents a breakthrough that allocates the number of particles evenly to each GPU. Thus, it can be stated that the proposed load balancing algorithm has a higher applicability than the fixed analysis area division algorithms.