Revision as of 15:22, 2 October 2013

Elmer is an open source (GPL) computational tool for multi-physics problems. It is developed by CSC in collaboration with Finnish universities, research laboratories and industry.

Getting started with the Virtual Machine

Step 1 - Install Virtual Box

If you don't have a virtualization utility already installed on your system, go to the Oracle VirtualBox website to download a binary package suitable for your host operating system. Follow the documentation to install the software components and to start the VirtualBox Manager.

Step 2 - Download the Virtual Machine ONELAB_VM

Virtual Machine

SHA1 checksum

Step 3 - Import the Virtual Machine in Virtual Box

In the VirtualBox Manager, import the downloaded OVA file by following the instructions. A new VM entry - named ONELAB_VM appears in the left panel.

Step 4 - Start the Virtual Machine

Start the VM by double clicking its entry in the VirtualBox Manager. Enter "plos" for login and "plos" again for password (without quotes)

Step 5 -

Open the Firefox browser of the Virtual Machine, reload this page and proceed from within the Virtual Machine.

CRYO

Download and inflate the archive cryo.zip in a work directory. Then right-click on the icon cryo.ol and opent it with gmsh. Alternatively, start gmsh and click File-> Open-> cryo.ol from the menu.

The physical background is the cryogenic treatment of warts by application of a cryogenic fluid. The idea is to maximize the destruction of wart tissue cells while minimizing damages to healthy skin tissue. A damage function depending on temperature distribution and exposure time is built to represent this trade-off. The purpose of the modeling is to determine the application time that minimizes this damage function.

Various geometrical and modeling parameters can be interactively modified in the ONELAB window. After execution, a plot of the damage function vs. time is displayed and the optimum application time tmin is shown to the ONELAB window.

Cryo-engineering metamodel

BEAM

Download and inflate the archive beam.zip in a work directory.

The physical background of this model is the didactical analysis of a clamped beam (static 3D elasticity). The dimensions of the beam and the material parameter can be modified interactively in the ONELAB window. Diagrams of the internal moments can be generated. Check for this the option Compute MT diagrams, click on Check and then on Run.

LASER

Download and inflate the archive laser.zip in a work directory. Then right-click on the icon cryo.ol and opent it with gmsh. Alternatively, start gmsh and click File-> Open-> laser.ol from the menu.

The physical background of this model is the laser stimulation of skin in order to measure the density of nociceptive receptors. For a correct interpretation of the experimental data, an accurate nowledge of the temperature distribution in time and across the skin is needed. The metamodel allows selecting various laser types (Gaussian, flat-top) and various stimus characteristics (imposed flux or controlled temperature). Each simulation generates a Gnuplot graphical output that is directly interpretable by clinicians.