ember
An 'Enhanced Multi-Block solvER' for turbomachinery computational fluid dynamics, written by James Brind of the Whittle Laboratory at the University of Cambridge. Solves the compressible Reynolds-averaged Navier-Stokes equations on multi-block structured meshes, using an evolution of the fast and robust Denton algorithms. Pre- and post-processing is handled through a numpy-like Python interface, while the heavy computations run through compiled Fortran for speed.
See the manual for full documentation
Installation
ember requires Python 3.12 or newer. Install it from the Python Package Index
under the distribution name ember-cfd, not the import name ember:
pip install ember-cfd
Precompiled wheels are published for Linux (x86_64), so no Fortran compiler is needed there. On other platforms pip falls back to building from source, which requires a Fortran toolchain. See the installation guide for more information on source builds and performance tuning the build for your CPU.
Example usage
Solve the flow through a straight annular duct:
import numpy as np
import ember.block
import ember.fluid
import ember.grid
import ember.patch
import ember.solver
# Generate coordinates for a straight annular duct
ni, nj, nk = 25, 17, 17
L = 0.1 # Span [m]
r_hub = 0.45 # Hub radius [m]
Nb = 60 # Number of blades [-]
pitch = 2 * np.pi / Nb # Theta periodicity [rad]
x = np.linspace(0.0, 2*L, ni)
r = np.linspace(0.0, L, nj) + r_hub
t = np.linspace(-pitch, pitch, nk) / 2
xrt = np.stack(np.meshgrid(x, r, t, indexing="ij"), axis=-1)
# Allocate a block and set up geometry
block = ember.block.Block(shape=(ni, nj, nk))
block.set_xrt(xrt)
block.set_Nb(Nb)
# Set working fluid to a perfect gas
fluid = ember.fluid.PerfectFluid(cp=1005.0, gamma=1.4, mu=1e-5, Pr=0.72)
block.set_fluid(fluid)
# Define inlet boundary conditions at i=0 face
# Fixed stagnation pressure and temperature, no swirl
Po1 = 1e5 # [Pa]
To1 = 300.0 # [K]
block.patches["inlet"] = ember.patch.InletPatch(i=0)
block.patches["inlet"].set_Po_To(Po1, To1)
block.patches["inlet"].set_Alpha(0.0)
block.patches["inlet"].set_Beta(0.0)
# Define outlet boundary conditions at i=-1 face
# Fixed static pressure
P2 = 0.9e5 # [Pa]
block.patches["outlet"] = ember.patch.OutletPatch(i=-1)
block.patches["outlet"].set_P(P2)
# Initial conditions: uniform axial flow
block.set_P_T(P2, To1)
Vx_guess = 100.0 # [m/s]
block.set_Vx(Vx_guess)
block.set_Vr(0.0)
block.set_Vt(0.0)
# Create a single-block grid, set wall distance for turbulence model
grid = ember.grid.Grid([block])
grid.calculate_wdist()
# Choose solver settings and run
solver = ember.solver.Solver(n_step=500, cfl=3.0, n_stage=4, n_levels=3)
solver.run(grid)
The example gallery works through the block interface, and demonstrates the capabilities of the processing interface.
1 maintainer
Metadata
1 maintainer
Release files for ember-cfd 0.4.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| ember_cfd-0.4.1.tar.gz | 2.5 MB | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| ember_cfd-0.4.1-cp314-cp314-win_amd64.whl | CPython 3.14 | CPython 3.14 | Windows x86-64 | Details |
| ember_cfd-0.4.1-cp314-cp314-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.14 | CPython 3.14 | Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 | Details |
| ember_cfd-0.4.1-cp314-cp314-macosx_26_0_arm64.whl | CPython 3.14 | CPython 3.14 | macOS 26.0+ ARM64 | Details |
| ember_cfd-0.4.1-cp313-cp313-win_amd64.whl | CPython 3.13 | CPython 3.13 | Windows x86-64 | Details |
| ember_cfd-0.4.1-cp313-cp313-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.13 | CPython 3.13 | Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 | Details |
| ember_cfd-0.4.1-cp313-cp313-macosx_26_0_arm64.whl | CPython 3.13 | CPython 3.13 | macOS 26.0+ ARM64 | Details |
| ember_cfd-0.4.1-cp312-cp312-win_amd64.whl | CPython 3.12 | CPython 3.12 | Windows x86-64 | Details |
| ember_cfd-0.4.1-cp312-cp312-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.12 | CPython 3.12 | Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 | Details |
| ember_cfd-0.4.1-cp312-cp312-macosx_26_0_arm64.whl | CPython 3.12 | CPython 3.12 | macOS 26.0+ ARM64 | Details |
Total release size: 24.2 MB
Release files / ember_cfd-0.4.1.tar.gz
| Download URL | ember_cfd-0.4.1.tar.gz |
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