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ANSYS CFX-Mesh Tutorials phần 6

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Set Type để cắt vật liệu và cơ quan cơ thể thẳng thừng. Để chọn cơ thể thẳng thừng, bạn có thể click vào cơ thểTạo ra các khu vực đầu vào: 1. 2. Tạo một khu vực hỗn hợp 2D được gọi là Vịnh. Chọn mặt hình chữ nhật vững chắc với mức thấp nhất X-phối hợp để áp dụng nó cho. | Tutorial 6 Butterfly Valve 3. Change Inflation Option to First Layer Thickness and set the First Prism Height to 0.5 mm. The pipe wall is to be modeled as a rough wall with an equivalent sand grain roughness of 0.2 mm. To maintain the validity of the assumptions used in modeling rough walls it is important that the thickness of the first element off the wall is not much smaller than the equivalent roughness height. In general a value equal to the roughness height is recommended which would be 0.2 mm here. It is also important that the mesh length scale does not increase dramatically in the transition from the last inflation layer to the rest of the volume mesh. The value chosen here for the first prism height combined with the high expansion factor allows the elements in the inflation layers to expand to a reasonable size before the transition to the rest of the volume mesh. To produce a good mesh for this geometry a much smaller Maximum Spacing is required allowing a First Prism Height of 0.2 mm to be used and a smooth transition from the last inflation layer to the bulk volume mesh. 4. In the Tree View right-click on Inflation and select Insert Inflated Boundary. 5. For Location select both pipe wall and Default 2D Region from the Tree View. Hold down the Ctrl key in order to select the second of these. Generating the Surface Mesh Next take a look at the mesh on the pipe wall 1. Right-click over Preview in the Tree View and select Insert Preview Group. Change the name of the Preview Group to pipe wall. 2. For Location select the Composite 2D Region pipe wall from the Tree View. 3. Now right-click over the Preview Group pipe wall in the Tree View and select Generate This Surface Mesh. The surface mesh will be generated on just the corresponding faces. 4. Click over the axes in the bottom right corner of the Model View in the position shown in the picture below. As you move the cursor into this position the black -X -axis will appear it is not shown by default . .