ANSYS CFX Advanced Training [Turbomachiery/TurboGrid] Ch4~Ch7

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Chapter 4. Topology

ATM 모드에서 Global size factor option을 쓴다. Global size factor가 커지면 mesh가 커진다. Factor를 주면 모든 방향 (i,j,k)로 늘어난다. 만약 factor를 1에서 2로 하면 mesh 수가 2배가 아니라 7~8배가 증가하게 된다.

Mesh생성시 negative volume이 나오면 안된다. Mesh생성시 빨간색은 기준이 넘는 것이지 문제가 되는 것은 아니다.

- Mesh limits (각도가 가장 중요하다)

 - Maximum face angle: 15 degC

 - Minimum face angle: 12 degC

Topoogy는 격자 요소들을 positioning을 위한 framework로서 활동하는 a structure of blocks이다.

Topology blocks represent sections of mesh that contain a regular pattern of hexahedral elements.

Topology Methods: ATM(Automated Topology and Meshing)

 - less user controls : Topology / blocking is automatically determined and cannot be adjusted.

 - Fully automated : control points are fixed

 - Blade offset in passage

 - Higher mesh quality than control point method

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Chapter 5. Mesh

From topology to mesh: mesh settings describe how the topology is converted to a mesh.

Mesh data 1) Mesh size 2) Passage 3) Hub/Shroud tip 4) Inlet/Outlet domain

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Chapter 6. ATM (Automated Topology and Meshing)

- A new method of automated topology resulting in high quality anisotropic hexahedral mesh

- Simplicity in use (overall & O-grid mesh sizing)

- Mesh quality preserved through increased mesh size

Chapter 7. Analysis and Optimization