CTSP (Contamination Transport Simulation Program)
CTSP (Contamination Transport Simulation Program) is a PIC-C developed program for modeling molecular and particulate contamination transport. The need to model contamination transport is commonly encountered in vacuum and aerospace industries. Plastics and other organic materials exposed to low pressures outgas unspent hydrocarbon molecules which can deposit on sensitive surfaces such as camera lenses or radiators. Other components may be sensitive to particulates. These are tiny dust particles arising from air pollution, garments, or flaking off paints. Particulates are present on all surfaces but can redistribute during vibrational events such as spacecraft launch or on-orbit deployments.
CTSP models the transport of molecular and particulate contaminants from their sources to the eventual target settling locations in order to estimate the end of life cleanliness levels. The code utilizes a kinetic method in which the contaminants are represented by simulation particles. Particle positions are advanced through small time steps. This allows the code to take into account aerodynamic, gravitational, or electrostatic forces acting on the particles. Unlike Monte Carlo ray tracing tools, CTSP concurrently simulates the entire contaminant population. The transition regime can thus be considered by including inter-particle collisions via the DSMC method. It also allows the end user to visualize the contaminant plume partial pressures or bulk streaming velocities. CTSP supports highly detailed, multi-million mesh element surface meshes to represent the test geometry. The code also implements multiple contamination-specific material sources, including a detailed model for molecular outgassing and particulate generation. Molecular surface adhesion and desorption physics is governed by surface temperature and material activation energy.
CTSP is a command line program for Microsoft Windows and Linux Ubuntu or CentOS distros. A COTS CAD/FEM meshing package is needed to generate the surface geometry model. A plotting program such as Tecplot or Paraview is needed to visualize the results.
Seat licenses are available to US customers. Please contact us for more information.
A handout is available here: CTSP-flyer.pdf
- L. Brieda, “Numerical Model for Molecular and Particulate Contamination Transport”, AIAA J. Spacecraft & Rockets, accepted for publication July 2018
- L. Brieda, “Molecular Contamination Modeling with CTSP”, Proceedings of 30th International Symposium on Rarefied Gas Dynamics, Vol. 1786, No. 01, 2016, http://doi.org/10.1063/1.4967536 (pdf)
- L. Brieda, “Molecular Outgassing and Deposition in EP Applications”, 34th International Electric Propulsion Conference (IEPC), Kobe, Japan, 2015 (pdf)