2D grids: about
Definition
A 2D grid is a face support, on which the user can evaluate a spatial quantity.
Use
A 2D grid is used for:
 plotting of scalar spatial quantities as colorshading isovalues
 plotting of scalar spatial quantities as arrows
 exportation of values
Shapes of 2D grids
2D grids can be of rectangular, annular, cylindrical or spherical shape.
2D grid and infinite box
The spatial support of the 2D grid type can be extended beyond the bounded study domain.
Mesh
The mesh of a 2D grid is based on a userdefined discretization: computation points are regularly spaced on the surface of the support.
Rectangular 2D grid
A 2D grid of rectangular type is built in one of the planes XY, YZ or XZ and characterized by a position, dimensions and discretizations.
An example of the definition of a rectangular 2D grid is presented below.
Definition of the "Rectangular" 2D grid  

The position is defined by:


The dimensions are defined by:


The discretization are defined by a number of elements along the two main axes of the plane 
Annular 2D grid
A 2D grid of annular type is built in the XY plane of the coordinate system for definition and is characterized by a position, dimensions and discretizations.
An example of the definition of an annular 2D grid is presented below.
Definition of the "Annular" 2D grid  

The position is defined by:


The dimensions are defined by:


The discretization are defined by: 




Angle unit of coordinate system  Angle θ 

degree  0< θ  ≤ 360 
radian  0< θ  ≤ 2 π 
Cylindrical 2D grid
A 2D grid of cylindrical type is characterized by a position, dimensions and discretizations.
An example of the definition of a cylindrical 2D grid (a part of a hollow cylinder) is presented below.
Definition of the "Cylindrical" 2D grid  

The position is defined by:


The dimensions are defined by:


The discretization are defined by: 




Angle unit of coordinate system  Angle θ 

degree  0< θ  ≤ 360 
radian  0< θ  ≤ 2 π 
Spherical 2D grid
A 2D grid of spherical type is characterized by a position, dimensions and discretizations.
An example of the definition of a spherical 2D grid (a part of a hollow sphere) is presented below.
Definition of the "Cylindrical" 2D grid  

The position is defined by:


The dimensions are defined by:


The discretizations are defined by: 




Angle unit of coordinate system  Angle θ  Angle φ 

degree  0< θ  ≤ 360  0< φ  ≤ 180 
radian  0< θ  ≤ 2 π  0< φ  ≤π 