파 구조물 지반의 비션형적 동적응답해석을 위한 직접수치해석기법의 개발
Direct Numerical Simulation on the Nonlinear Dynamic Responses among Wave, Structure and Seabed
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초록
파랑하중하의 지반내 간극수압의 정확한 평가는 연안구조물에서 지반의 안정성을 검토하는데 중요한 요소이다. 파 · 구조물 · 지반의 상호간섭에 대한 대부분의 기존 수치모델은 파동장과 지반부를 분리하여 해석하는 Hybrid기법을 적용하고 있기 때문에, 보다 고정도로 이들의 상호간섭을 모의하기 위해서는 파랑하중하에서 파 · 구조물 · 지반을 일체화한 수치모델의 개발이 필요하다. 본 연구에서는 투과층의 다양한 기하학적인 형태에 따라 층류저항까지 고려한 모델화된 유체저항을 도입하여 파 · 구조물 · 지반의 비선형동적응답을 해석하기 위한 직접수치해석기법을 새롭게 제안하였다. 직접수치해석기법은 Hybrid기법과는 달리 유체와 다공질매체의 접합면에서 특별한 경계조건을 필요로 하지 않는다. 파 · 구조물 · 지반의 상호간섭에 대해 기존의 수리실험결과와 본 연구의 계산결과를 비교함으로써 좋은 일치성을 확인할 수 있었다. 따라서 새롭게 제안된 본 수치기법은 파 · 구조물 · 지반의 비선형동적응답을 평가하는 유용한 기법으로 판단된다
Abstract
Accurate estimation of the wave-induced pore water pressure in the seabed is key factor in studying the stability of the seabed in the vicinity of coastal structure. Most of the existing numerical models for wavestructureseabed interaction have been linked through applying hybrid numerical technique which is analysis method separating the wave field and seabed regime. Therefore, it is necessary to develope a numerical model for simulating accurately wavestructureseabed interaction under wave loadings by the single domain approach for wave field and seabed regime together. In this study, direct numerical simulation is newly proposed. In this model, modeled fluid drag has been used to detect the hydraulic properties according to the varied geometrical shape inside the porous media by considering the turbulence resistance as well as laminar resistance. Contrary to hybrid numerical technique, direct numerical simulation avoids the explicit formulation of the boundary conditions at the fluid/porous media interface. A good agreement has been obtained by the comparison between existed experimental results by hydraulic model test and direct numerical simulation results for wavestructureseabed interaction. Therefore, the newly proposed numerical model is a powerful tool for estimating the nonlinear dynamic responses among a structure, its seabed foundation and water waves.
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