ensight-reader

This library provides a pure Python reader (with some writing capability) for the EnSight Gold data format, a common format for results of computational fluid dynamics (CFD) simulations. It also comes with a few CLI tools, notably ensight_transform which allows you to perform in-place scaling/translation/etc. of the geometry in your case.

The library designed for efficient, selective, memory-mapped access to data from EnSight Gold case – something that would be useful when importing the data into other systems. If you're looking for a more "batteries included" solution, look at vtkEnSightGoldBinaryReader from the VTK library (see docs for comparison).

Requirements

• Python 3.9+
• NumPy 1.21+

Installation

pip install ensight-reader

Example – Python API

import ensightreader
import numpy as np

case = ensightreader.read_case("example.case")
geofile = case.get_geometry_model()

part_names = geofile.get_part_names()                # ["internalMesh", ...]
part = geofile.get_part_by_name(part_names[0])
N = part.number_of_nodes

with geofile.open() as fp_geo:
    node_coordinates = part.read_coordinates(fp_geo)  # np.ndarray((N, 3), dtype=np.float32)

variable = case.get_variable("UMean")

with variable.mmap_writable() as mm_var:
    data = variable.read_node_data(mm_var, part.part_id)
    data[:] = np.sqrt(data)                           # transform variable data in-place

Example – CLI

# increment X coordinate
ensight_transform --translate 1 0 0 sphere.case

# scale by 1000 (eg. m -> mm conversion)
ensight_transform --scale 1e3 1e3 1e3 sphere.case

# rotation matrix
ensight_transform --matrix \
    0 -1  0  0 \
    1  0  0  0 \
    0  0  1  0 \
    0  0  0  1 \
    sphere.case

# transform only "internalMesh" part
ensight_transform --translate 1 0 0 --only-parts internalMesh motorbike.case

To learn more, please see the documentation.