효율적인 해양구조물 유동 해석을 위한 직교좌표계기반의 코드 개발 - AMR, VOF, IBM, VIV, LES의 통합
Development of a Cartesian-based Code for Effective Simulation of Flow Around a Marine Structure - Integration of AMR, VOF, IBM, VIV, LES
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Simulation of flow past a complex marine structure requires a fine resolution in the vicinity of the structure, whereas a coarse resolutionis enough far away from it. Therefore, a lot of grid cells may be wasted, when a simple Cartesian grid system is used for an ImmersedBoundary Method (IBM). To alleviate this problems while maintaining the Cartesian frame work, we adopted an Adaptive MeshRefinement (AMR) scheme where the grid system dynamically and locally refines as needed. In this study, We implemented a movingIBM and an AMR technique in our basic 3D incompressible Navier-Stokes solver. A Volume Of Fluid (VOF) method was used toeffectively treat the free surface, and a recently developed Lagrangian Dynamic Subgrid-scale Model (LDSM) was incorporated in thecode for accurate turbulence modeling. To capture vortex induced vibration accurately, the equation for the structure movement and thegoverning equations for fluid flow were solved at the same time implicitly. Also, We have developed an interface by using AutoLISP,which can properly distribute marker particles for IBM, compute the geometrical information of the object, and transfer it to the solver forthe main simulation. To verify our numerical methodology, our results were compared with other authors’ numerical and experimentalresults for the benchmark problems, revealing excellent agreement. Using the verified code, we investigated the following cases. (1)simulating flow around a floating sphere. (2) simulating flow past a marine structure.
Abstract
Simulation of flow past a complex marine structure requires a fine resolution in the vicinity of the structure, whereas a coarse resolutionis enough far away from it. Therefore, a lot of grid cells may be wasted, when a simple Cartesian grid system is used for an ImmersedBoundary Method (IBM). To alleviate this problems while maintaining the Cartesian frame work, we adopted an Adaptive MeshRefinement (AMR) scheme where the grid system dynamically and locally refines as needed. In this study, We implemented a movingIBM and an AMR technique in our basic 3D incompressible Navier-Stokes solver. A Volume Of Fluid (VOF) method was used toeffectively treat the free surface, and a recently developed Lagrangian Dynamic Subgrid-scale Model (LDSM) was incorporated in thecode for accurate turbulence modeling. To capture vortex induced vibration accurately, the equation for the structure movement and thegoverning equations for fluid flow were solved at the same time implicitly. Also, We have developed an interface by using AutoLISP,which can properly distribute marker particles for IBM, compute the geometrical information of the object, and transfer it to the solver forthe main simulation. To verify our numerical methodology, our results were compared with other authors’ numerical and experimentalresults for the benchmark problems, revealing excellent agreement. Using the verified code, we investigated the following cases. (1)simulating flow around a floating sphere. (2) simulating flow past a marine structure.
참고문헌 (14)
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