Getting started#

Install prerequisites#

Ansys Chemkin 2025 R2 or later with a valid license
Python 3.9 or later
NumPy 1.14.0 or later
PyYAML 6.0 or later
Matplotlib to run examples

Note

Using the latest Ansys Chemkin version is highly recommended.

Install PyChemkin#

Install PyChemkin.

Download the ansys-chemkin-core package from the PyAnsys GitHub repository. Build the wheelhouse locally using Flit:
```
python -m build
```
Install the package using pip:
```
pip install dist\ansys_chemkin-*.whl
```
Alternatively, you can install the package directly from the PyPI repository:
```
pip install ansys-chemkin-core
```
Verify the installation.

Open the Python interpreter from the Windows command prompt and import the ansys-chemkin-core package:
```
>>> import ansys.chemkin.core
```
If PyChemkin is installed correctly, Python displays a statement like this:
```
Chemkin version number = xxx
PyChemkin version number = x.x.x
```
PyChemkin is probably not installed locally if Python displays nothing:
```
>>>
```
If Python displays the following statement, update the local Ansys Chemkin installation to 2025 R2 or later:
```
PyChemkin does not support Chemkin versions older than 2025 R2
```

Note

You must have a valid Ansys license to run PyChemkin after installation.
PyChemkin will search for the latest version of the local Ansys Chemkin installation and use it automatically. Use the PYCK_CHEMKIN_VER environment variable to specify the desired local Ansys Chemkin installation. For example, set PYCK_CHEMKIN_VER="261" to force PyChemkin to use Ansys Chemkin 2026 R1.