FERS_core
FERS_core is an open-source Finite Element Method (FEM) library written in Rust with a Python interface. It provides the foundational tools and components necessary for performing FEM analysis. This core package is designed for users who need a reliable and efficient FEM solver.
Features
- Basic Finite Element Method (FEM) solvers
- Mesh generation and manipulation tools
- Support for various types of finite elements
- Easy-to-use Python interface for integration with existing workflows
- Designed for high performance with Rust
Installation
You can install FERS_core via pip:
pip install FERS
Solving a model
from fers_core.builders import create_beam
model = create_beam(5.0, "IPE180", udl=-5000.0) # 5 m span, 5 kN/m downward
model.run_analysis()
print(model.resultsbundle)
Use run_analysis_to_file(path, ...) instead when the result is large — it
streams the JSON straight to disk rather than through the Python heap.
Premium solves and timeouts
Without an API key the solver runs at Free-tier limits (100 members) and makes
no network call at all. Passing api_key raises those limits:
model.run_analysis(api_key=KEY)
A key means each solve first verifies the licence with ferscloud.com, so that
handshake is bounded. If the licence server does not answer within
license_timeout seconds (default 30) the call raises FersTimeoutError
before the solve starts — so retrying is always safe:
import fers_calculations
try:
model.run_analysis(api_key=KEY, license_timeout=60)
except fers_calculations.FersTimeoutError:
... # transient stall — retry or skip this model
except RuntimeError:
... # definitive — bad key, non-premium account, or a rejected model
Keeping those two arms apart is the point: retrying a RuntimeError fails
identically, while collapsing both into except Exception turns a retryable
blip into a lost result. See fers_core/examples/203_Premium_Batch_Solve.py
for the full unattended-batch pattern.
FersTimeoutError subclasses the built-in TimeoutError, so a plain
except TimeoutError catches it too.
Set FERS_LICENSE_TIMEOUT (seconds) to change the default without editing any
call sites. It must be a real environment variable — .env files are not read
by the engine.
license_timeoutbounds the licence handshake, not the solve. A solve is native code with no cancellation point, so no in-process timeout can interrupt it. For a hard ceiling on total wall time per model, run each solve in a killable subprocess — that also reclaims its memory.
Requires engine fers_calculations >= 0.2.53.
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