Industry's First High-Fidelity LES Solver
Cadence Fidelity CharLES
The industry's first high-fidelity CFD solver that expands large eddy simulation (LES) to a broad range of engineering applications — aeroacoustics, aerodynamics, combustion, heat transfer, and multiphase. Leverages CPUs and GPUs to bring LES turnaround from days to hours.
Overview
LES at Engineering Turnaround
LES used to be a research tool — too expensive for industrial design loops. Fidelity CharLES changes that. By leveraging both CPUs and GPUs and scaling linearly to hundreds of GPUs across dozens of nodes, it brings the LES turnaround on real engineering geometries down from days to hours.
The result: high-fidelity unsteady simulation becomes a regular part of design — not a one-off study. Aeroacoustic certification, combustion stability, wake-resolved aerodynamics — all in the iteration cycle.
Key Capabilities
What Makes CharLES Different
Voronoi Meshing
Voronoi meshing is the foundation — inherent quality, body-fitted, scalable. The mesher is purpose-built for the solver.
GPU Acceleration
Scales linearly to hundreds of GPUs across dozens of nodes. GPU-native execution, not bolt-on offload.
Advanced LES Numerics
Advanced numerical methods with extreme scalability — preserve LES fidelity at industrial geometry sizes.
Days to Hours
LES turnaround on realistic engineering geometries drops from days to hours — design iteration becomes feasible.
Ffowcs Williams-Hawkings
Aeroacoustic predictions via the FW-H analogy — far-field noise from near-field unsteady CFD without spending mesh on the far field.
Quantitative Imaging
Dimensional reduction, modal decomposition, quantitative imaging — extract physics from the unsteady solution beyond raw field data.
Applications
Where LES Pays Back
Aeroacoustics
Far-field noise prediction via FW-H — automotive cabin noise, aircraft community noise, fan / rotor tonal noise.
Unsteady Aerodynamics
Wake-resolved external aerodynamics — separated flows, buffet, gust response, jet plumes, plume-airframe interaction.
Combustion
Premixed and non-premixed combustion under turbulence-chemistry interaction — combustion instabilities, emissions prediction.
Heat Transfer
Unsteady wall heat-transfer prediction — turbine blade cooling, gas-path heat loads, hot-gas ingestion.
Multiphase
Two-phase and free-surface phenomena resolved at LES fidelity — spray combustion, atomisation, primary breakup.
Rotor / Propeller Noise
Tonal and broadband rotor noise — UAVs, eVTOL, marine propellers, ducted fans. Combines well with Fine Marine and Turbo.
Performance
From Research Tool to Engineering Tool
The Fidelity Charles Solver leverages both CPUs and GPUs, reducing LES turnaround from days to hours and scaling linearly to hundreds of GPUs across dozens of nodes. LES stops being a one-off study and becomes part of the design iteration loop.
Combine with the Millennium Enterprise Multiphysics Platform for a turnkey LES + HPC stack — Cadence-hosted, ITAR-certified cloud, or on-premises.
Analysis Tools
Get Physics Out, Not Just Field Data
Dimensional Reduction
Project unsteady fields onto reduced-order representations — extract dominant flow features without drowning in raw data.
Acoustic Predictions
Ffowcs Williams-Hawkings analogy for far-field noise prediction — built-in, no third-party plug-ins.
Quantitative Imaging
Quantitative imaging post-processing — turn LES data into the same diagnostic visualisations used in experimental work.
Modal Decomposition
POD, DMD, spectral methods — identify coherent structures and instability modes from the unsteady solution.
Extreme Scalability
Linear scaling to hundreds of GPUs — production-scale LES on real geometry, not just textbook benchmarks.
Robust Analysis
Robust analysis tools that turn LES results into engineering decisions — go beyond visualisation toward quantitative engineering output.
Related
Works Well With
Fidelity Flow DBS
Density-based RANS / DES for steady and unsteady aero — use as the upstream tool before CharLES LES for the regions that need it.
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Fidelity Turbo
Rotating-machinery solver — CharLES adds LES for rotor noise and unsteady wake studies of turbomachinery.
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Fidelity Autogrid
Mesh pre-processing — Voronoi meshing pairs natively with the CharLES solver core.
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Get Started
Bring LES Into the Design Loop
Talk to Craftronics about Fidelity CharLES — high-fidelity LES at engineering turnaround.