Type Grid

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Mesh or grid can be in 3- dimension and 2-dimension. Meshing has applications in the fields of geography, designing, computational fluid dynamics. And many more places. The two-dimensional meshing includes simple polygon, polygon with holes, multiple domain and curved domain. In three dimensions there are three types of inputs. The responsive grid focuses on consistent spacing widths, rather than column width. Material Design margins and columns follow an 8px square baseline grid. The spacing property is an integer between 0 and 10 inclusive.

Description

Pointwise generates structured, unstructured, hybrid, overset, voxel, and high-order grids. The element types it makes include triangles, quadrilaterals, tetrahedra, pyramids, prisms andhexahedra. Pointwise divides the overall computational space into one or more sub-regions called blocks.

Pointwise can be used to generate both 2D and 3D blocks. A 2D block consists entirely of surface cells while a 3D block contains entirely volumetriccells. All blocks in the same grid must either be 2D or 3D; you cannot combine blocks of differing dimensionality in the same grid.

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Tip: When deciding which topology to use for a geometry, there are several factors you have to take into consideration: how much timeyou have available for the grid generation process, the grid types your solver supports, the accuracy desired in certain areas of your grid, and the desired grid size.

Structured, Unstructured, and Hybrid Grids

The type of each block can either be structured, unstructured or hybrid. A structured blockconsists entirely of quadrilateral (2D) or hexahedral (3D) cells that have been arranged in anordered IxJxK array. An unstructured block consists of triangles and quadrilaterals (2D) ortetrahedral, pyramid, prism, and hexahedral cells (3D) having no implicit order. If all blocksin a grid are structured, then the overall grid type is called structured. When all blocks in a gridare unstructured, then the overall grid type is called unstructured. If the grid consists of bothstructured and unstructured blocks, the overall grid is called hybrid, a special type ofunstructured grid.

This structured grid was generated using the Glyph scripting language.
This unstructured grid was generated using the T-Rex meshing algorithm.

Special Grid Types

Pointwise can also be used to generate the following special grid types in 3D: overset, voxel,high-order.

Overset grids use multiple disconnected grids to discretize the computational space. The component grids (which can be structured, unstructured, or hybrid) need only overlap each other to completely cover the computational space and may intersect one another. As a final pre-processing step, a composite grid assembly software determines both which grid points lay outside the computational space and grid-to-grid connectivity.

Type Grid
This overset grid was assembled using 7 overlapping structured component grids. The surface grid and symmetry plane have been colored according to which of the component grids they belong.

Voxel grids are a special type of unstructured grid that use layers of regularcartesian-aligned hexahedral cells, instead of isotropic tetrahedral cells, to fill theinterior of the volume.

This voxel grid was created by using the T-Rex meshing algorithm to create the boundary layer and point cloud sources to give additional refinement below the rotors.

High-order grids provide increased solution accuracy for finite-element solvers by increasingthe polynomial degree of the basis functions assumed for the solution within each element (alsoknown as P-refinement). High-order grids are created from an initial linear (or P1) grid byincreasing the number of points that define each element according to the desired polynomialdefinition (quadratic, cubic, etc.). As a final pre-processing step, the grid is deformed andsmoothed in order to accurately capture curved geometry.

This high-order grid was created by elevating an unstructured grid to P2. The inset image displays the grid points on the surface and symmetry plane near the nose. Linear points are displayed in red and high-order points are displayed in blue.

Each column in the grid is defined using a Column Definition (ColDef). Columns are positioned in the grid according to the order the Column Definitions are specified in the Grid Options.

The following example shows a simple grid with 3 columns defined:

See Column Properties for a list of all properties that can be applied to a column.

If you want the columns to be grouped, you can include them as children like so:

Groups are explained in more detail in the section Column Groups.

Modular grid examples

Custom Column Types

In addition to the above, the grid provides additional ways to help simplify and avoid duplication of column definitions. This is done through the following:

  • defaultColDef: contains properties that all columns will inherit.
  • defaultColGroupDef: contains properties that all column groups will inherit.
  • columnTypes: specific column types containing properties that column definitions can inherit.

Default columns and column types can specify any of the column properties available on a column.

Grid

Column Types are designed to work on Columns only, i.e. they won't be applied to Column Groups.

The following code snippet demonstrates these three properties:

When the grid creates a column it starts with the default column definition, then adds in anything from the column type, then finally adds in items from the specific column definition.

For example, the following is an outline of the steps used when creating 'Col C' shown above:

The following example demonstrates the different configuration properties in action.

Css

Right Aligned and Numeric Columns

The grid provides a handy shortcut for aligning columns to the right. Setting the column definition type to rightAligned aligns the column header and contents to the right, which makes the scanning of the data easier for the user.

Because right alignment is used for numbers, we also provided an alias numericColumn that can be used to align the header and cell text to the right.

Column IDs

How to make a grid

Each column generated by the grid is given a unique Column ID, which is used in parts of the Grid API.

If you are using the API and the columns IDs are a little complex (e.g. if two columns have the same field, or if you are using valueGetter instead of field) then it is useful to understand how columns IDs are generated.

If the user provides colId in the column definition, then this is used, otherwise the field is used. If both colId and field exist then colId gets preference. If neither colId nor field exists then a number is assigned. Finally, the ID is ensured to be unique by appending '_n' if necessary, where n is the first positive number that allows uniqueness.

Types Of Coordinate Grids

In the example below, columns are set up to demonstrate the different ways IDs are generated. Open the example in a new tab and observe the output in the dev console. Note the following:

Type Grid Pokemon

  • Col 1 and Col 2 both use colId. The grid appends '_1' to Col 2 to make the ID unique.
  • Col 3 and Col 4 both use field. The grid appends '_1' to Col 4 to make the ID unique.
  • Col 5 and Col 6 have neither colId or field so the grid generates column IDs.