NEKCEM

In the software package NEKCEM (Nekton for Computational ElectroMagnetics) the spectral element discontinuous Galerkin (SEDG) method is employed on a conformal spectral-element mesh. NEKCEM features geometric flexibility, spectrally accurate numerical convergence, and an efficient parallel implementation.

This package consists of the components of meshing, Maxwell time domain solver, electrostatic poisson solver, and visualization tools. It supports the computational domain boundary with perfectly matched layer, perfect conductor, and periodic material.

Download and Installation Instructions (Quick Start)

Download and Update Version:
software package published on http://mercurial.mcs.anl.gov/nekcem/
- Unix command for the First Time Users:
  hg clone http://mercurial.mcs.anl.gov/nekcem
- Unix command for the Old Users:
  hg pull http://mercurial.mcs.anl.gov/nekcem
  hg update http://mercurial.mcs.anl.gov/nekcem
- Download other software tools:
  http://www-unix.mcs.anl.gov/~mmin/nekcem/nek-helpful-software.tar
  (prex,postx,genmap,n2to3,paraview-2.4.3-x86-linux.tar.gz, PyVTK-0.latest.tar.gz)

Contents of the NEKCEM package:
It consists of the following main directories: bin, examples, libs, src, doc,...etc.
- bin: script files
  
  home/bin/genmap, n2to3, prex: place them under home directory and use for meshing.
  nekcem/bin/makenek, nek, arch-settings: running scripts
  nekcem/bin/run_paraview, post2vtk: visualization
  home/bin/postx: for visualization.
- examples: test problems
  
  examples/2dnanocyl/ : 2d nano cylinder
  examples/3dbowtie/ : 3d bowtie mesh
  examples/include/nano-source.inc : included in 2dnanocyl.usr
  examples/2dnanocyl/2dnanocyl.usr : subroutine user_drude defines the nano objects.
- libs: libraries (blas, lapack)
- src : source files
- doc : documentation

Installation and instructions:
- Mesh generation:
  
  type preh in example/2dnanocyl/ to bring up the GUI for meshing.
  specify a name such as 2dnanocyl.rea in the preh interface;
  build meshes;define boundary conditions.
  using preh, you generate 2dnanocyl.rea, and running genmap 2dnanocyl.rea will generate 2dnanocyl.map.
- Define 2dnanocyl.usr in examples/2dnanocyl/
  
  Define the degree of polynomial "lxi=5" in SIZEu.
- Compile:
  
  makenek 2dnanocyl
  2dnanocyl.usr will be moved as subuser.F into src.
  check out makenek -h for compile option for different platforms
  SIZEu will be moved as SIZE into src
- Execute:
  
  nek 2dnanocyl
  check out nek -h for compile option for different platforms
  generates field files such as 2dnanocyl.fld01, 2dnanocyl.fld02,... for postx
  generates field files such as 2dnanocyl001.dat, 2dnanocyl002.dat,... for vtk
- GUI for results: use either postx or paraview.
  
  type postx in examples/2dnanocyl/
  type "2dnanocyl" in the postx interface to read field files
  postx enables to produce *.gif for making movie, *.plt, and etc.
  
  type "../../bin/run_paraview -T1000" under "example/2dnanocyl/" to visualize with paraview: for Nsteps = 1000.

General description: doc/
- rea-file.txt: explains the data for each line in 2dnanocyl.rea.

Examples

2-D dielectric cylinder.

2-D Drude models for a nanocylinder.

2-D Drude models for a nanocylinder: [E_x]| [E_y]| [Energy]

3-D Drude models for a nanosphere.

Drude model with 40 spheres.

* The animated GIFs appear on explorer, firefox, netscape.