준선형 수치모델을 이용한 투과성 소파장치의 반사율
Reflection of Porous Wave Absorber Using Quasi-linear Numerical Model
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초록
본 연구에서는 투과성 판을 통과하면서 발생하는 에너지 손실효과를 나타내는 비선형 항력 항을 등가 선형화기법으로 선형화시킨 준선형 모델을 제안하였다. 이 모델을 경계요소법(Boundary Element Method)으로 풀어 2 차원 조파수조의 투과성 소파장치를 개발에 활용하였다. 투과성 판에서의 항력계수는 수리 모형실험 결과와 비교를통해 새롭게 구하였다. 공극률 0.1, 잠긴 깊이 d/h = 0.1, 경사각도 10 o ≤ θ ≤ 20 o를 갖는 투과성 소파장치가 전반적으로 우수한 소파성능을 보였다. 개발된 준선형 수치모델은 앞으로 다양한 형태의 투과성 소파장치의 최적 설계에 활용될 것이다.
Abstract
In present study, we suggested the quasi-linear model that linearizes the quadratic drag representing the energy loss across the porous plate. The quasi-linear model was solved by Boundary Element Method (BEM) for development of the porous wave absorber suitable for 2-D wave tank. The drag coefficient at the porous plate was newly obtained through comparison of experimental results. It is found that the porous wave absorber with porosity 0.1, submergence depth d/h = 0.1, and inclined angle 10o ≤ θ ≤ 20o shows the effective wave absorption. Using the developed quasi-linear numerical model, the optimal design of various types of a porous wave absorber will be applied.
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