ContaminationFlow: A Molflow+-based test-particle Monte-Carlo code for simulating contamination transfer under molecular flow conditions

We introduce the new simulation tool ContaminationFlow, a test-particle Monte-Carlo (TPMC) simulator to predict the spread of contamination in vacuum environments with a view to virtual prototyping of space vehicles and earth bound vacuum applications. The paper comprises a description of the TPMC method for transient particle transport simulations under molecular flow conditions and for long-term investigations up to several years, which is illustrated by a benchmark problem. The implemented physical models are described along with the simulation algorithm. Strengths and weaknesses of the software are evaluated as well as future measures with regard to the improvement of the prediction accuracy are pointed out.