Submitted by Marton Ady on Friday, June 8, 2012 - 17:12.
Recently two MolFlow users have been facing a similar problem:
One of them wanted to simulate outgassing due to beam loss, others had outgassing due to electrons in the system. In both cases, they had a distribution of outgassing that changed depending on the location. The only way to enter it to MolFlow was to create a matrix of facets, and define the outgassing rate one-by-one. A rather long and boring process.
So I decided to create a way of defining a spacial outgassing distribution. The key is the Explode command that existed already in Molflow.
First, you have to define how fine the outgassing matrix is by defining a regular mesh:
Then we select the facet and issue the new "create outgassing map" command:
Below you see a map of the facet. For each mesh element, you can manually set the outgassing value. Note that the edited cell's location is highlighted on the geometry (similar to texture plotter):
You can also paste values from the clipboard from Excel. The values are pasted to the right and bottom from the actual cell. Then you can define the desorption type (Uniform, Cosine, Cosine^N). Finally, if everything's ready, click Explode.
The exploded geometry highlights those facets that have a desorption now:
To test that everything was well defined, add a mesh that counts desorbed molecules, and you'll see a nice colormap of the values you just entered:
Submitted by Marton Ady on Wednesday, May 16, 2012 - 11:58.
GEO files can be big. This is partly because they are text files (readable in let's say Notepad), but also because they often contain repetitive information (for example, even a tiny facets with default parameters takes about 20 lines to write).
There is also a problem related to this: sending them by email or sharing over Dropbox might result in the browser interpreting the content (ie. displaying the GEO file as a webpage instead of downloading, the email client putting the file content in the email, etc.).
Good news is, because of this uncompact and repetitive behaviour, they are very well compressible. It is not common to have 2% compression ratio, converting a 100MB GEO file to a 2MB GEO7Z file.
Submitted by Marton Ady on Wednesday, May 16, 2012 - 10:55.
In the Tools / Global Settings menu, you can find a new option: autosave. You can toggle the frequency in minutes, and it is possible to restrict this to only when simulation is running (and when it is assumed that the file save process doesn't interrupt your work).