The model considers ASW (amorphous solid water) which has been deposited on a plate and how the surface molecules move about over time.

See:
Description

Packages

The model considers ASW (amorphous solid water) which has been deposited on a plate and how the surface molecules move about over time.

When molecules strike crystaline ice (CI) they stick because of greater binding energy. Over time the CI grows and the ASW shrinks.

The ASW modeling code has three major abstractions:

• surface plate (Plate)
• spot of interest(Spot)
• diffusion model (Diffuse)

used by control code in ModelC. Additional code is scattered through ASWutil and BMP.

Each run produces an HTML page with links to a series of images, where each image is a snapshot of the surface some short time after the previous snapshot.

There are currently a number of (too many!) magic parameters controlling the simulation. These include:

• the size and shape of the "neighborhood";
• the diffusion model which may include:
  • the "natural" fixity of ASW, CI, and the denuded zone;
  • the significance of geometry on the fixity;
  • the variation in the fixity; and
• the level at which a molecule may break free.

Other parameters include

• the size of the patch being simulated;
• the location, size, and shape of objects on the patch;
• the brightness of the image to be formed;
• how often images are to be generated;

Most recently we've been looking at the rate at which a wave train decays towards a flat surface as a function of the number of waves(k) across the patch. You may find results from some runs below:

From this we've found an exponential decay as shown here. overview.html was last edited by Randolph Bentson, on 2005/03/08T09:47:04-08:00