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Introductory Course Delft3D-RGFGRID

Introductory Course Delft3D-RGFGRID. Generation and manipulation of curvi-linear grids. Why use a curvi-linear grid?. high resolution in the area of interest low resolution far away at boundaries to save computational costs avoid stair-case boundaries (also at gullies) Requirements:

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Introductory Course Delft3D-RGFGRID

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  1. Introductory Course Delft3D-RGFGRID Generation and manipulation of curvi-linear grids

  2. Why use a curvi-linear grid? • high resolution in the area of interest • low resolution far away at boundaries to save computational costs • avoid stair-case boundaries (also at gullies) • Requirements: • smooth w.r.t. consecutive grid cells (10 - 20 %) • orthogonal (< 0.02)

  3. General strategy • iterative grid generation, grid shape procedure • rough sketch using splines • refinement • orthogonalisation • grid manipulation

  4. Example spline grid

  5. First rough grid

  6. Refined and orthogonalised

  7. RGFGRID - File

  8. RGFGRID – Co-ordinate System

  9. RGFGRID - Operations Better to use Edit – Block Orthogonalise

  10. RGFGRID - View

  11. RGFGRID - Edit

  12. RGFGRID – Edit – Shortcut keys • D delete (polygon or grid) point • E* delete polygon • I insert (polygon or grid) point • R replace (polygon or grid) point • X* break up polygon • * keep pressed

  13. RGFGRID - Operations DD grids require the same M,N orientation

  14. RGFGRID - Settings

  15. This is what it may look like

  16. In detail

  17. Hands-on Delft3D-RGFGRID • identify flow problem • determine resolution in area of interest • determine position of open boundaries (where does boundary condition data come from) • open boundaries sufficiently far away, (especially WL-boundaries) • grid lines preferably parallel to main channels, coast line • maintain orthogonality and smoothness • iterative grid refinement / grid shape procedure • save intermediate splines and grids

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