Testcase: 2D Plain Channel Flow Simulation
Author:   Jiaxing Qi
Email:    jiaxing.qi@uni-siegen.de
Date:     06 Aug. 2013

How to run this testcase:
0. choose Reynolds number by exporting environment variable Re
  e.g. export Re=100

1. choose mesh refinement level by exporting environment variable level
  e.g. export level=7
  (possible refine levels are 6, 7, 8, 9, 10)

2. provide email address to which result files will be sent by exporting environment email
  e.g. export email=yourname@uni-siegen.de

3. provide seeder and musubi exe path
  e.g. export musubi=~/apes/musubi/build/musubi
  e.g. export seeder=~/apes/seeder/build/seeder

4. run runTestcase.sh script
  e.g. ./runTestcase.sh

5. simulation results will be sent to your email box.
   results (that are compared with refenrece) are:
   velocity distribution across channel
   shear stress
   strain rate

This testcase runs a 2D plain channel flow simulation.
The channel geometry has a height of .01, length of 0.08
boundary conditions: 
  velocity_inlet, 
  pressure_outlet, 
  no-slip wall (simple bounce back)

This testcase contains the following files:
common.lua: include common parameters used by both mesh generation and LB
simulation. In this way, different size of channel can be easily set up.
seeder.lua: lua file used to generate mesh.
musubi.lua: lua file used to run LB simulation.
evaluate.sh: script file to run the whole simulation chain.

Reference: Linear Euler analytical solution
