như thể hiện trong hình dưới đây. Bây giờ xác định các góc độ chính xác như sau. Sử dụng phần Kích thước của tab Phác thảo, và chọn góc. Sau đó nhấn vào dòng và sau đó trên trục-X. Nếu góc sai được hiển thị sau khi bạn đã lựa chọn các trục | Tutorial 11 Airlift Reactor Setting up the Regions Create the 2D Regions 1. Create a Composite 2D Region called Sparger on the top part of the small hole the ring sparger . 2. Create a Composite 2D Region called Top on the very top face of the reactor highest Y-coordinate . 3. Create a Composite 2D Region called Column on the column walls. You need to select five faces the three parts of the outside wall highest X-coordinate the bottom face of the reactor lowest Y-coordinate and the bottom part of the small hole which forms the ring sparger. 4. Create a Composite 2D Region called Symmetryl on the two faces which lie in the XYPlane. 5. Create a Composite 2D Region called Symmetry2 on the two faces which are directly opposite the faces used for Symmetry1. Finally create a Composite 2D Region on the internal face which will form the draft tube. In order to do this it is important to understand the difference between faces and 2D Regions when there are multiple solids in the geometry and how to use the selection rectangles. If you have not already done so you are advised to work through or at least read the meshing section of Tutorial 6 Butterfly Valve and the meshing section of Tutorial 10 Heating Coil. For the Composite 2D Region which comprises the draft tube it is appropriate to include only one side of the internal face. When you come to set up the Thin Surface boundary condition in CFX-Pre the other side of the face will then be automatically identified as the other side of the thin surface. 1. Right-click over Regions in the Tree View and select Insert Composite 2D Region. Change its name to DraftTube. 2. Click on the cyan ball in the triad at the bottom right of the Model View to put the geometry into a good viewing position for the selection. 3. Place the cursor in the position shown in the picture below and click with the left mouse button. 110 CFX-Mesh Tutorials. . 5A5 IP Inc. Section 2 Mesh Generation 4. The selection rectangles will appear. The 2D Regions
