Tutorial on WDK-VENUS: A Streamlined and Modular Workflow for High-Temperature Dynamics and Kinetics of Atom-Diatom
1School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Chemical Theory and Mechanism, Chongqing University, Chongqing 401331, P. R. China.
This study introduces WDK-VENUS, a new automated workflow for quasi-classical trajectory (QCT) simulations. It efficiently calculates reaction rate coefficients for hypersonic flows, crucial for high-temperature aerodynamics.
Area of Science:
- Computational fluid dynamics
- Chemical kinetics
- Aerospace engineering
Background:
- High-precision dynamic simulations are vital for understanding hypersonic flows and nonequilibrium effects.
- The quasi-classical trajectory (QCT) method is essential for modeling microscopic molecular collisions.
- Existing QCT programs lack automated workflows for converting trajectory data to reaction rate coefficients.
Purpose of the Study:
- To develop WDK-VENUS, a modular QCT workflow for atom-diatom collisions.
- To automate the calculation of reaction rate coefficients from QCT simulations.
- To facilitate high-temperature aerodynamics research by simplifying QCT analysis.
Main Methods:
- The VENUS program was enhanced to handle high rovibrational states.
- An automated bmax test module was implemented.
- An external Python code with modules for sampling, Gaussian process regression (GPR), validation, and rate coefficient calculation was developed.
Main Results:
- WDK-VENUS provides an automated workflow for QCT simulations.
- The workflow utilizes GPR machine learning to fit models and calculate high-precision integral cross sections (ICSs).
- Equilibrium and nonequilibrium rate coefficients can be calculated with reduced human intervention.
Conclusions:
- WDK-VENUS simplifies QCT calculations and integrates Python analysis tools.
- The modular design supports batch processing and facilitates broader interdisciplinary applications.
- This workflow enhances the study of high-temperature thermochemical nonequilibrium flows.
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