mkgeo_grid(1rheolef)

📦
version 7.2 · 4 versions
, in debian trixie, ubuntu noble, ubuntu questing

💅 mkgeo_grid — structured mesh of a parallelepiped 💅

okay bestie, welcome to the rheolef manual, section 1rheolef — yes we're doing the whole "mkgeo_grid(1rheolef)" thing but cute ✨

✨ NAME ✨

mkgeo_grid — a structured mesh of a parallelepiped, brought to you by rheolef-7.2 🧊

🦋 SYNOPSIS 🦋

mkgeo_grid [options] [nx [ny [nz]]]

🍓 EXAMPLES 🍓

okay so the classic move: build a triangular-based 2d 10x10 grid of the unit square, like this:

mkgeo_grid -t 10 > square-10.geo
geo square-10.geo

orrr you can just do it all in one command line, main character energy:

mkgeo_grid -t 10 | geo -

🌸 DESCRIPTION 🌸

This command is so useful when you're testing programs on simple geometries. It literally skips the whole "prepare an input file for a mesh generator" saga. No cap. 💀

The optional nx, ny and nz arguments are integers that specify the subdivision in each direction. Defaults? nx=10, ny=nx and nz=ny. The mesh files go on standard output — pipe away, queen 👑

And it supports all the possible element types: edges, triangles, rectangles, tetrahedra, prisms and hexahedra. the range. we love to see it 🫶

👑 ELEMENT TYPE OPTION 👑

  • -e — 1d mesh using edges 🪡
  • -t — 2d mesh using triangles 🔺
  • -q — 2d mesh using quadrangles (rectangles) 🟦
  • -T — 3d mesh using tetrahedra 🔻
  • -P — 3d mesh using prisms 💎
  • -H — 3d mesh using hexahedra 🎲

🌈 THE GEOMETRY 🌈

  • -a float
  • -b float
  • -c float
  • -d float
  • -f float
  • -g float

The geometry can be any [a,b] segment, [a,b]x[c,d] rectangle or [a,b]x[c,d]x[f,g] parallelepiped. By default a=c=f=0 and b=d=g=1, so we're vibing with the unit boxes 📦

For instance, this command meshes the [-2,2]x[-1.5, 1.5] rectangle:

mkgeo_grid -t 10 -a -2 -b 2 -c -1.5 -d 1.5 | geo -

🎀 BOUNDARY DOMAINS 🎀

  • -[no]sides — the boundary sides are represented by domains: left, right, top, bottom, front and back 🧭
  • -[no]boundary — this option defines a domain named boundary that groups all sides 🫂

By default, both sides and the whole boundary are defined as domains:

mkgeo_grid -t 10 -nosides | geo -
mkgeo_grid -t 10 -noboundary | geo -
mkgeo_grid -t 10 -noboundary -nosides | geo -

🧚 REGIONS 🧚

  • -[no]region — the whole domain is split into two subdomains: east and west. Also, the separating domain is named interface in the mesh. This option is used for testing computations with subdomains (e.g. transmission problem; see usersguide) 📖

Example:

mkgeo_grid -t 10 -region | geo -

⭐ CORNERS ⭐

  • -[no]corner — the corners (four in 2D and eight in 3D) are defined as OD-domains. This could be useful for some special boundary conditions 🔩

Example:

mkgeo_grid -t 10 -corner | geo -
mkgeo_grid -T  5 -corner | geo -

💜 COORDINATE SYSTEM OPTIONS 💜

  • -cartesian
  • -rz
  • -zr

Specifies the coordinate system. The default is cartesian while -rz and -zr denote some axisymmetric coordinate systems 🔄 Recall that most of Rheolef codes are coordinate-system independent and the coordinate system is specified in the geometry file .geo. iykyk 📁

🔥 IMPLEMENTATION 🔥

This documentation has been generated from file main/sbin/mkgeo_grid.sh 📜

🌟 AUTHOR 🌟

Pierre Saramito <Pierre.Saramito@imag.fr> 👑

Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@imag.fr>

GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. ⚠️

okay that's the whole page bestie, mwah 💋 this was rheolef, Version 7.2, and the page itself is mkgeo_grid(1rheolef) — go mesh something iconic 🦋✨

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