NairnFEAMPMViz

NairnFEAMPMViz is a Java application to create simulations, run them, and visualize them. This page has brief instruction on its use and on compiling it if you need to change the source code.

Introduction

The nairn-mpm-fea project includes source code for a Java application called NairnFEAMPMViz that lets you create input files, run calculations, and visualize results for both OSParticulas, NairnMPM, and NairnFEA. The nairn-mpm-fea check has a NairnFEAMPMViz.jar file for this application that is ready to run. Note that NairnFEAMPMViz requires a system with Java 1.6.0 (a.k.a Java 6) or newer installed.

If you want to make changes to the code, you will need to see the instruction on compiling NairnFEAMPMViz to learn how to create a new jar file from the altered source code.

Running NairnFEAMPMViz

You can start a Java application as a jar file by double clicking on the jar file. Although this works on most computers, the application will start with the default amount of memory for the Java Virtual Machine. The default memory is enough to open small calculations, but not enough for larger calculations. To start NairnFEAMPMViz with more memory, you should launch the Java application from a command line using:

java -Xmx512m -jar NairnFEAMPMViz.jar

The -Xmx option allocates the desired memory (where "m" means in megabytes). The -jar option gives a path to the compiled jar file (the above assumes you are in the same folder as the jar file.

When running in Windows, you can launch from a Windows command prompt or from a cygwin shell. In either case, you will need to include the path to the java command in your PATH environment variable. The path to Java executables in Windows will be something like:

C:\Program Files\Java\jdk1.6.0_03\bin

Installation of java may add this path to your Windows environment for you; if not you will have to edit the system environment variables and add it. For cygwin, its $PATH variable does not use the Windows path; thus you will need to manually add the java path to cygwin's $PATH variable as well, perhaps in one of your login files (e.g., .bash_profile). You should add a path that will be similar to:

/cygdrive/c/Files/Java/jdk1.6.0_03/bin

Note the use of forward slashes in cygwin paths instead of Window's back slashes.

Another method in Windows to launch NairnFEAMPMViz correctly is to create a simple batch file. The process is:

Make a copy of the file nairn-mpm-fea/Visualization/build/NairnFEAMPMVIz.bat and edit that copy. This file will contain something like
```
C:
chdir "C:\Documents and Settings\user\nairn-mpm-fea\Visualization\build"
java -Xmx512m -jar NairnFEAMPMViz.jar
```
Edit the second line to be the full path to the folder with your NairnFEAMPMViz jar file (quote the path if it includes spaces in some directory names). The last line assumes your Windows environment includes the path to the java command. If note, you can replace java by the full path to the java executable.
Next create a short cut to the batch file (and give it any desired name). Right click on the new shortcut and select "Properties". In the properties window, click "Change Icon..." and "Browse..." for the NairnFEAMPMViz.ico file (in the nairn-mpm-fea/Visualization/build folder).
Finally, move the short cut to your desktop (or to any other folder). You can double click the shortcut to launch NairnFEAMPMViz ready for calculations and/or visualization.

Running NairnFEAMPMViz on a Remote Computer

To run NairnFEAMPMViz remotely (such as running from a terminal connected to a Linux cluster that has your code and calculation results), you have to log onto the remote computer using X11 terminal software and enable "trusted X11 forwarding." The command line is

ssh -Y -l username servername

Once connected, start NairnFEAMPMViz using the java command line method described in the previous section.

Very Brief Usage Instructions

Initial Setup

The first time you run NairnFEAMPMViz, you have to tell the application the location of the NairnFEA, OSParticulas, and NairnMPM code engines and of a Unix shell. The steps are

Choose "Preferences..." menu command or click the "Prefs" icon
Click the "Code" tab
Click the first five "Change..." buttons and locate the OSParticulas (or NairnMPM) executable, the NairnMPM.dtd file, the NairnFEA executable, the NairnFEA.dtd file, and the bash shell command, respectively. In Windows, the bash command will be in the bin folder of the root cygwin or cygwin64 folder; in other systems, it will be in the /bin folder.
Optionally click the last "Change..." button and select a work space directory. When a directory is selected, NairnFEAMPMViz will default to this directory when opening and saving files.

To do a test calculation, choose the "File → New FEA Commands" or File → New MPM Commands" menu commands (or click their icons). These will open a file with sample scripted input commands. Save the new commands to a new file with extension .fmcmd and the calculations.

Subsequent Usage

The use of NairnFEAMPMViz follows these general tasks:

You can create new input commands files (or open saved ones) and edit them in a text editing window.To edit input files and launch calculations, see the help on running the code. Results run in NairnFEAMPMViz will automatically open for visualization when done.
To run an analysis, choose the "Analyze → Run FEA/MPM Analysis" command (or click the run arrow icon). You will asked to decide where to save the results (as an .fea or .mpm file). Once you select a name, the calculations will run.
When the calculations are done, the results file will open for visualization. The text results will appear in the top two sections of a new window. A control panel for visualizing results will appear in the bottom section.
- To plot results, select a plot type in the control panel area and then follow the blue line to select all available options for that type of plot.
- Finally, click the "Plot" button to get the plot in a new window. To plot different results, select new options and click the "Plot" button again (which may have changed to "Replot" or "Add Plot").
To open saved results for visualization use the "Open..." menu command or click the "Folder" icon. Note that "calculation results" are in the file of output text sent by OSParticulas, NairnMPM or NairnFEA to standard output, and not one of the associated files written by those calculations. Once opened, the text results will appear as described above after running calculations.
For more details on use of NairnFEAMPM, click the "Help" button in the application.

Performance Issues

The nature of Java applications is that they are slower than compiled applications. Thus NairnFEAMPMViz is slower than NairnFEAMPM. The speed of NairnFEAMPMViz, however, is good. All internal calculations run fast. The slowest step is the time required to draw the graphics to the screen. Furthermore, this can be very system dependent

Running on a Linux machine using an X11 terminal is significantly slower, especially when any window with graphics is open. You will want to avoid this option, unless it is the only option available (i.e., when your only access to the data is through a remote login). The differences are caused by the system dependent Java virtual machines and between X11 and non-X11 uses by Java.

Compiling NairnFEAMPMViz Java Application

One option for creating new visualization tools, is to edit the NairnFEAMPMViz source code and create them. After editing, you will need to recompile the code as explained in this section.

Command Line Compile

You can compile the code and create the jar file on a Unix/Linux command line by running the script called makejar that is located at:

nairn-mpm-fea/Visualization/build/makejar

When you run this script, it will compile the Java source code and create a self-contained jar file in that same directory. By default this script assumes compilation on Windows. To compile on Mac uses makejar -m. To compile on Linux, use makejar -l.

To run this script, you need the javac compiler and jar utility installed on your computer. Compilation requires Java 1.6.0 or newer. It is available free on various platforms as part of the standard Java Development Kit (JDK) installation.

If the required javac and jar tools are not in the default path, you can edit the makejar file and enter the full path to each command (or add their paths to your $PATH environment variable). When using cygwin in Windows, the path to the java binaries will be something like:

/cygdrive/c/Program Files/Java/jdk1.6.0_03/bin

Compiling Using Eclipse

Eclipse is an open-source and free development system for Java (and for other languages with the appropriate plug ins). This section explains how to import the NairnFEAMPMViz code into an Eclipse project. This method was done using Eclipse Indigo (3.7), which is available free for Windows, Mac, and other platforms. These steps will probably work for other versions too, possible with minor modifications.

The first steps are to install and prepare Eclipse for Java development. These steps also need tools for subversion and are described here. Be sure to do the optional step for Java development.

You are now ready to manage Eclipse projects using SVN. To get started with a NairnFEAMPMViz project, do the following:

Choose menu command "New → Project...", expand the "SVN" section, choose "Project from SVN" and click "Next".
You will be asked to select an SVN repository. Enter the following settings followed by clicking "Next":
- URL: https://nairn-mpm-fea.googlecode.com/svn/trunk/Visualization/src
- User: enter your gmail name for access to googlecode</tt (this process is assuming you have been added as a "contributor" to the nairn-mpm-fea project. You can request to be added by sending email to project owner.

Choose "Head Revision" for latest version or use date or revision options for older versions and then click "Next" (or "Finish" is "Next" is not available). Select "Check out as project with the name specified" and specify NairnFEAMPMViz. Click "Finish" and the project will be created. It should automatically build and be ready to run. To create a running option with sufficient memory, choose the "Run Configurations..." menu command Select "Java Application" and click the "New" icon to create a new runnable Enter any name such as "NairnFEAMPMViz with Memory". Enter "NairnFEAMPMViz" (or browse for it) into the Project field Enter "NairnFEAMPMViz" (or browse for it) into the Main class field Click on "Arguments" tab Enter "-Xmx512m" into the VM Arguments field (this command tells the Java machine to allocate 512 MB for running NairnFEAMPMViz. You can increase or decrease the memory as needed). Click "Apply" Click "Run" to run NairnFEAMPMViz In the future, you can run using the "NairnFEAMPMViz with Memory" item in the Run History menu

The above process will create a project in your Eclipse workspace that will have a copy of the files needed for the NairnFEAMPMViz project. You can update to the latest version by right clicking (or control clicking on Mac) the project name and selecting "Update" from the "Team" submenu. If you are certified as a project committer, you can save your changes by right clicking (or control clicking on Mac) on the project name and choosing "Team → Commit..." (be sure to enter message described the changes being committed).

The above process will let you compile and run NairnFEAMPMViz within Eclipse. You can also use Eclipse to create a jar file, which can be run outside of Eclipse. The process is:Choose menu command "Export..." and then select "Runable Jar File" in the "Java" section. Click "Next". Choose the NairnFEAMPMViz launch configuration (such as the "NairnFEAMPMViz with Memory" one created above), choose export destination (which by default is (project)/lib/NairnFEAMPMViz.jar, where (project) is the name you gave this project in your workspace), and select to "Extract required libraries into generated JAR". Click "Finish" to generate the jar file. See above to run the new jar with sufficient memory.