Computer science for research
Modelling approaches
The vast majority of numerical activities carried out in the Centre relate to the modelling and simulation of all heat and mass transfer modes (heat conduction, convection, thermal radiation, phase change) as well as to the modeling of the thermal and radiative properties of heterogeneous media. The developments described cover also phenomenological aspects of components and energy systems. The three following transverse categories gather the differents tasks:
- non-isothermal and multiphase flows:
| Heat transfer mode | Turbulent convection and visco-elastic flows | Two-phase flows involving boiling and bubble tracking | Convection-radiation coupling |
| Methods | DNS/LES and LBM | VOF/Level-set | DNS and DOM/Monte Carlo |
- radiative and conductive heat transfer:
| Heat transfer mode | Thermal radiation | Heat conduction | ||
| Length scale | Macroscopic | Micro to nanoscale | Nanoscale | |
| Method |
Monte Carlo / Symbolic Monte Carlo Spectral modelling acceleration |
Fluctuational electrodynamics | DOM / Monte Carlo |
- components and energy-related systems:
| Level of description | Components | Systems | |
| Methods | Energy balance equations / Semi-empirical analyses | Modal orthogonal decomposition | Dynamical thermal models |
| Grey-box approaches | Model order reduction | Artificial Intelligence (Neural Networks / Bayesian Inference) |
Means of calculation
CETHIL has its own computation cluster service. For larger CPU-time calculations, CETHIL members have access to local infrastructures, such as those of the Federation de Calcul Lyonnaise, and national ones (IDRIS/CINES).
In-house simulation softwares:
Among the diverse tools developped, flagship softwares include OPAL (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">OpenCL Link-wise ACM on Many-core Processors), Open-CLAMP (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">OpenCL Processor Array Lattice Boltzmann Method solver), PAC-HT (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Water Heat Pump at High Temperature), StaRPM
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA"> (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Statistical methods for Radiation in Participating Media), SLICE
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA"> (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Simplified L-distributions with ICE scheme), MuNeRa
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA"> (
minor-latin;mso-bidi-font-family:"Century Gothic";color:#333333;mso-ansi-language:
EN-CA;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Multilayer Near Field Radiative Heat Transfer).
Commercial simulation softwares:
Commonly-used softwares at CETHIL are thermal simulation tools, dynamical or not, adapted to multiphysics problems, energy systems, buildings and various other systems, including for instance COMSOL, StarCCM +, EES, TRNSYS.