**About penacho - Smokestack pollutant dispersion simulator**

**Penacho** calculates and draws the gas dispersion of a smokestack in the atmosphere. The plume evolution and the pollutant concentration distribution over the surrounding area can be seen in an interactive 3D graph.

**Penacho** is free software, publised under GNU GPL.

The user can input the problem data in a structured graphical interface: fluid characteristics at the chimney output, air and surface conditions, atmospheric stability and yearly wind conditions. It's a huge amount of data, but Penacho starts with a typical problem parameters. The UI uses the Qt libraries.

**Penacho** solves its physic atmospheric dispersion model: about 53 equations covering fluid mechanics, plume rise, particles deposition, diffusion of contaminants, etc. Some model simplifications are: one dimension plume, stationary flux and plain ground. The differential equations are solved with Cvode C libraries (part of Sundials project).

**Penacho** can draw plume evolution, pollutant concentration distribution over the surrounding area and particles deposition. Penacho provides impressive 3 dimensional graphs, completely interactive: zoom, rotation and move. Concentration can be plotted simultaneously as an isosurface and a grid plane in x, y and/or z axis direction.

Simulation results can be exported as a text file, vtk structured points or CSV (suitable for spreadsheets). The graphics are built with the Visualization Toolkit (VTK) library.

UI, math solver and graphics module are completely independent. So, for example, you don't have to know a word about Qt or Vtk if you are just editing some differential equations.

**Penacho** source code is self documented using Doxygen, which generates a complete C++ class and source file reference manual, both in HTML and PDF. Documentation about physic modeling, mathematical equations, program users' manual and programmers' manual is written in LaTeX, but so far only in Spanish.

About **Penacho**: it was born in a Master Thesis in Industrial Engineering. "Penacho" means plume in Spanish, but it also means pride.