Installation

Running the nozzle model requires the following elements to be installed:

• meshutils : a simple in-house C code embedded in MULTIF used for CAD and pre-/post-processing,
• SU2 : CFD code developed at Stanford,
• GMsh : an open source mesh generator,
• AEROS : finite element code developed at Stanford.

meshutils

Meshutils is a simple in-house C code embedded in the MULTIF python module. It computes the nozzle shape parameterization and performs all the pre- post-processing operations. The C functions are directly called from python.

To compile meshutils, first change the current directory to the one containing the core of multif:

$ cd /Path/to/MULTIF
$ cd multif/

Then, run the following command, which require to specify the location of the Gmsh include files and library.

$ python setup.py build_ext --inplace --include-dirs=/path/to/Gmsh/include/gmsh --library-dirs=/path/to/Gmsh/install/lib

This will compile meshutils and create a python module to be imported in multif.

NB: Running the setup requires to have SWIG installed. SWIG is a widely used software development tool that connects programs written in C with python. More information: http://www.swig.org

SU2

A custom version of SU2 is available on github:

$ git clone -b darpa https://github.com/vmenier/SU2.git

All the information needed to compile SU2 can be found here: https://github.com/su2code/SU2/wiki/Installation

Specific information for windows users: https://github.com/su2code/SU2/wiki/Windows-Installation

This version of SU2 includes a local under-relaxation coefficient and a local CFL value for implicit simulations. To enable them, the following options were added to the configuration file:

 % ---- Local CFL options ----

 % Activate local CFL? (YES/NO)
 CFL_ADAPT_LOCAL= YES

 % Parameters of the adaptive CFL number (factor down, factor up, CFL min value,   
 %                                        CFL max value )       
 CFL_ADAPT_LOCAL_PARAM= ( 0.1, 1.5, 1e-12, 30.0 ) 

 % ---- Under-relaxation options ----
 
 % Activate local under-relaxation? (YES/NO)
 RELAXATION_LOCAL= YES

 % Maximum local variation percentage of the density at each time step,
 % and minimum value for the density
 HARD_LIMITING_PARAM= (0.25, 1e-5)

Gmsh

[//]: # Gmsh can also be installed by either downloading one of the binaries available (see http://gmsh.info/bin/), or by compiling the source code (see http://gmsh.info/src/).

Currently Gmsh must be compiled from the source code with openCASCADE support. To do so, obtain the Gmsh source code (see http://gmsh.info/src/) and ensure openCASCADE is installed (this can be done via package manager for Linux distributions, for example on Ubuntu the liboce-foundation-dev and/or liboce-modeling-dev packages suffice). On Linux, the following example set of instructions have been successfully used:

tar -zxvf gmsh-2.13.1-source.tgz mkdir gmsh-2.13.1-build cd gmsh-2.13.1-build
cmake ../path/to/gmsh/source cmake -DENABLE_FLTK:BOOL=OFF -DCMAKE_INSTALL_PREFIX=/path/to/install/location . cmake -DDEFAULT=0 -DENABLE_BUILD_LIB=1 -DENABLE_BUILD_SHARED=1 . make lib make shared make install

Note that if you are a mac user, you can install Gmsh using Homebrew (http://brew.sh) by running the following command line: brew install gmsh

AEROS

Aero-S is the general-purpose finite element code developed by the FRG at Stanford.