On the use of 3D simulations in Energy and Buildings related applications

Transcription

1 On the use of 3D simulations in Energy and Buildings related applications Dr. Cécile Goffaux Energy & Buildings Team Leader Contact: Doc. ref.: ENB-NS

2 Energy & Cenaero in a nutshell T & R D Ph ce n da Energy Gui re a tw f & So Buildings D & R Universities Companies

3 Energy, Buildings & Environment: so many challenges, actors and scales in action... g n i ild ems u B yst S & Active envelop Sm art citi es Pe op le Comfort, Efficiency, Energy, Safety, Health,... Manufacturer, Designer, Owner, Cities,...

4 Among these, what's the key role of simulations? Trial/error not full scale Decrease the time to market Innovative product development Large scale projects Cost reduction Trade-off to find btw simulation & experiment on demonstrator (ex. Wind tunnel) Technical/Economic optimisation Guide the decision process Incremental process to identify the key parameters/phenomena Norms requirement check & certification (efficiency, comfort, safety)

5 So many different tools: example for energy efficiency in buildings Different goals, design stage, expertise, accuracy, time constant 1D Dynamic tools Certification tools (PHPP, PEB, RT2012) 3D CFD-based tools

6 Why are 3D CFD-based methods growing? R&I is growing towards enhanced and novel designs Customer/user requirements increase...such as or with the next generation of norms? Towards more accuracy (multi-physics) Towards both local and holistic design

7 3D costs, expertise, time constant: so many barriers... What are the trends & philosophy for the near future? Promote a rational use Multi-fidelity approach in the different design stages Cope with known limitations of others tools Dedicated issues Qualitative/incremental approach Reduce the gap btw 3D mockup and 3D simulations Exchange protocols based on IFC standards BIM philosophy Provide the technology Saasification Opensource technology & dvp Automated chains Interoperability with others tools

8 Few Cenaero Buildings Energy efficient design Comfort and air quality assessment HVAC design, optimization and integration assessment Innovative wind-driven & thermal system design Smart Cities Pedestrian comfort Urban & industrial pollutant/smog dispersion Wind resource assessment for natural ventilation for building and small wind turbine design

9 Few Cenaero Wind Energy Design Fatigue, noise analysis, conditioned based monitoring support Grid integration Green processes Thermal management Energy recovery system design Biomass Safety Wind-induced mechanical efforts (civil engineering) Fire safety engineering

10 CFD-based quantification and optimisation of product efficiency for the industry -Develop TiO2 coating on steel for city depollution -Assess the efficiency in case of wind-driven flows Tests KO CFD/multi-physics with local effects Objectives Extract the dominant parameters Optimize the product CFD + Optimisation CPU time issue Need to find the best CFD approach Need to assess the discrepancies (benchmarks) Qualitative approach instead of quantitative, coupled with surrogate model (= interpolated model)

11 JAI benchmark for the wind-driven flow around an isolated building (wind tunnel) Wind tunnel benchmark: allows to define the right turbulence model & the mesh to deal with a 3D flow issue... Roof (acceptable) Wake loop close to building (acceptable) Wake badly estimated (far field, vortex shedding missed) but a deeper numerical investigation is necessary since the process is multi-physics (flow + energy + Nox diffusion)

12 Model exploitation: surrogate model to assess the coating efficiency in case of wind-driven flow Wind speed Solar heat flux Coating properties Minamo DoE (surrogate model) Optimization CFD model 3D resolved mesh ANOVA 1st sensitivity Coating efficiency optimization efficiency Wind is dominant: k coating efficiency saturation velocity profile around an isolated coated building Coating improves destruction k v

13 Towards a Saas solution for the mechanical design of light structures Cover group: SME software edition 3D design of light structures Improve the Eurocode by proposing innovation based on 3D dynamic simulations of wind loads Closing the loop R&D (methodolgy, validation) -Standard bilateral exchanges btw 3D simulations and 3D mockup -API dvp -Automatization, robustness, optimisation of 3D simulation chains -Opensource Saas for Cover customer

14 R&D development and validation (SIMBA project) In-situ results on the roof CFD Eurocode Wind tunnel on mock-up Experimental BBRI Roof results Mechanical design

15 Provide the technology A first success to match the partner requirements CAO Configurations Expected level of norm improvement Acceptable CPU time for calculation License cost vs Opensource Saasification solution vs packaged solution Next steps Robustness/Automatisation Saas Cenaero (Cetic)