1. Building a Hex Mesh
First, we are going to construct a structured hex mesh. The hex mesh will span from 0 meters to 4000 m, 4000 m, and 3000 m, for the x/y/z coordinates respectively.
For both consistency and rapid parameter manipulation, these can be stored in
variables. In LaGriT, variables are assigned using the define keyword.
define / X0 / 0.
define / X1 / 4000.
define / Y0 / 0.
define / Y1 / 4000.
define / Z0 / 0.
define / Z1 / 3000.
define / NX / 51
define / NY / 51
define / NZ / 26
define / MONAME / mohex
Above, the spatial domain (X0,X1,Y0,...), element density (NX/NY/NZ), and
mesh name (MONAME) have been defined.
Next, we will create an empty mesh object, with element type hex, using the
cmo / create command:
cmo / create / MONAME / / / hex
Due to the variable assignment of MONAME <- mohex above, this command is
translated internally as:
cmo / create / mohex / / / hex
This empty object can then be populated with nodes and elements.
The createpts / brick command will generate a defined number of
hex elements across a defined domain.
createpts / brick / xyz / NX NY NZ / X0 Y0 Z0 / X1 Y1 Z1 / 1 1 1
NX number of hex elements, along with their corresponding vertices, have been
created in the spatial domain spanning X0->X1, along with NY elements in
the Y domain and NZ elements in the Z domain.
Optionally, save the mesh object:
dump / avs / tmp_hex_01.inp / MONAME
This file can be rendered in certain scientific 3D visualization applications, such as ParaView.