PURPOSES : In this study, a numerical clogging model that can be used to realistically visualize the movement of particles in cylindrical permeability test equipment was proposed based on the system coupling of computational fluid dynamics with the discrete element method and experimental permeability test results. This model can also be used to simulate the interaction of dust particles with bedding particles.
METHODS: A 4-way system coupling method with multiphase volumes of the fluid model and porous media model was proposed. The proposed model needs to consider the influence of flow on the dust particles, interaction between the dust particles, and interaction between the dust particles and bedding layer particles. The permeability coefficient of the bedding layer in cylindrical permeability test equipment was not calculated by using the permeability test result, but was estimated by using the particle packing model and Ergun model.
RESULTS : The numerical simulation demonstrated a good agreement with the experimental test results in terms of permeability and drain time. Additionally, the initial movement of particles due to the sudden drain hole opening was successfully captured by the numerical model.
CONCLUSIONS : A 4-way coupling model was sufficient to simulate the water flow and particle movement in cylindrical permeability test equipment. However, additional tests and simulation are required to utilize the model for more realistic block pavement systems.

ABSTRACT
 1. 연구배경 및 목적
 2. 문헌고찰 및 이론적 배경
  2.1. 유체 유동 해석
  2.2. 입자 거동 해석
  2.3. 조합해석 이론
 3. 수치해석을 활용한 투수실험 모사
  3.1. 투수 실험 조건
  3.2. 투수 실험 모사 조건
  3.3. 투수 실험 모사 결과
 4. 결론 및 고찰
 REFERENCES

• 윤태영(한국건설기술연구원) | Yun Taeyoung 교신저자
• 조윤호(중앙대학교) | Cho Yoon Ho