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[blockMesh] Mesh refinement and geometry of a Cube

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Old   May 29, 2022, 08:08
Default Mesh refinement and geometry of a Cube
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Hello, I want to refine the mesh of a cube with edge length of 108mm. I am simulating a spray which sprays the fuel from the top to the bottom. I want to refine the mesh on the top where the fuel is injected to the cube. Further down and around the spray, the mesh should be coarser (green block). I want to divide the cube in 9 blocks, as you can see on the attached picture (and inject the fuel unlike on the picture, from the top to the bottom along y axis). The mesh in the middle block should be refined (red block).
I attached the paraview picture to show you from where the injection should begin.
Is it possible to do that by only adjusting simpleGrading or multiGrading? If so, how do I adjust it to achieve this division and refined mesh? I tried it many times, but I don't get it how I want to.
Attached Images
File Type: png blockMeshDict.png (23.6 KB, 5 views)
File Type: png division.png (14.9 KB, 8 views)
File Type: png Mesh refinement.png (54.7 KB, 5 views)
File Type: jpg paraview.jpg (68.7 KB, 12 views)
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mesh refinement study, spray injection

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