开源的CFD代码dolfyn伴随着一个预处理器。

预处理器以适合dolfyn的格式写入几何文件。该 输入是一组三个文件，描述了细胞，顶点连接边界。Dolfyn读取几何文件和一个单独的输入文件。在这个输入文件中，用户设置数字和模型数据，边界条件等。输入文件可以用任何简单的编辑器编辑。(The Open Source CFD code dolfyn is accompanied by a preprocessor.

The preprocessor writes a geometry file in a format suitable for dolfyn. The input is a set of three files which describe the cells, vertices en the boundaries. Dolfyn reads the geometry file and a separate input file. In this input file the user sets numerical and model data, boundary conditions etc. The input file can be edited with any simple editor.)