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Helyx Elements

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Presenta una interfaz de Asistente aerodinámico externo para simulaciones de aerodinámica externa del vehículo, además de una interfaz CFD de propósito general para resolver otras aplicaciones de diseño de flujo automotriz

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Helyx Elements

  1. 1. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. INTRODUCTION TO V2.3.0 Advanced Open-Source CFD for Automotive Design Francisco J. Campos Director of Operations 14 November 2017
  2. 2. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. About ENGYS › Global providers of CFD products and services › Founded in the UK (2009) › Main focus on leveraging open-source software − FOAM/OpenFOAM developers since 1999 › Strong annual growth › 6 offices worldwide − UK, Germany, Italy, USA, Australia, RSA › Well established resellers network − Japan, South Korea, China, USA, Benelux OPENFOAM® and OpenCFD® are registered trade marks of OpenCFD Ltd.
  3. 3. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Our Products HELYX General-purpose, open- source CFD for enterprise ELEMENTS Advanced open-source CFD for automotive design HELYX ADD-ONS Adjoint optimisation Block-coupled solvers Marine hydrodynamics Advanced multi-phase flow HELYX-OS Open-source GUI for standard OpenFOAM HELYX-OS is not approved or endorsed by OpenCFD Ltd., producer and distributor of OpenFOAM software via www.openfoam.com, and owner of the OPENFOAM® and OpenCFD® trade marks.
  4. 4. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  5. 5. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Origins AUTO RESEARCH CENTER Automotive Engineering R&D, Wind Tunnel, 7-Post & Gearbox Rig, CFD ENGYS Open-source CAE Software Engineering, CFD, MDO, Development, Support STREAMLINE SOLUTIONS LLC ARC and ENGYS unique combination of automotive engineering resources and CAE software development expertise to create ELEMENTS for CFD automotive analysis using open-source methods Joint Venture
  6. 6. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Vision Vehicle design analysis suite satisfying the needs of styling, engineering and management Open-source CFD simulation engine (powered by HELYX® - ENGYS) Modular program architecture for fast expansion and development First-class user support and extensive written documentation Embedded best practices for best-in-class vehicle design simulation Advanced Graphical User Interface (GUI) for ease-of-use
  7. 7. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Package CFD GUI General purpose CFD analysis HELYX® Core Open-source CFD simulation engine User Support Help line Aero GUI Aerodynamics setup wizard ELEMENTS Add-ons Solver extension modules (e.g. Adjoint) Code Maintenance Regular software updates/upgrades Documentation User reference guide and tutorials
  8. 8. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  9. 9. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Overview › Wizard type GUI for Virtual Wind Tunnel simulations › 6 simple simulation steps: › Automatic CFD mesh and DES setup for multiple vehicle shapes and configurations › Validated DES methods › Fully-customisable setup → embed your own simulation practices in the GUI › Open-source simulation engine
  10. 10. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Product Launcher › ELEMENTS incorporates two CFD interfaces in one GUI: External Aero GUI External vehicle aerodynamics wizard General purpose CFD interface UHTM, HVAC, cabin comfort, powertrain, CAA…
  11. 11. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Simulation Setup
  12. 12. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Wind Tunnel Validation › Objectives: − Validate best-practices for external aerodynamics CFD › Requirements: − Wind tunnel measurements (ARC and OEMs wind tunnels) − Wide range of vehicle shapes › Outcome: − Automatic CFD process − Consistent drag prediction across multiple vehicle shapes − High accuracy within a specified confidence interval of error › Reference: − de Villiers, E. et.al, ELEMENTS - A New Aerodynamics Analysis Software, International Journal of Automotive Engineering, 2014.
  13. 13. › Sedan › Hatchback › Estate › SUV › Streamliner › Nascar › Indycar › Light Duty Truck › Heavy Duty Truck © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Wind Tunnel Validation Vehicle Types
  14. 14. › All vehicle types › Fixed Ground › 5-belt Moving Ground › Single Belt Moving Ground › Test Speed › Yaw Angle › Ride Height › Vehicle Modifications (e.g. Cooling close/open, Spoiler on/off, Underbody Panels on/off) © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Wind Tunnel Validation 200+ Test Configurations
  15. 15. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Wind Tunnel Validation Cars > Cars →
  16. 16. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Aero GUI > Wind Tunnel Validation Trucks > Trucks →
  17. 17. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  18. 18. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. General CFD Interface > Overview › General purpose CFD interface for automotive applications: − UHTM (CHT, fans, porous media) − CAA (LES/DES turbulence) − HVAC (thermal flows, radiation) − Soiling (Lagrange DPM) − Water management (VOF, multiphase) − Others › Automatic hex-dominant mesh › Easy setup and usage › Open-source simulation engine
  19. 19. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. General CFD Interface > Product Launcher › ELEMENTS incorporates two CFD interfaces in one GUI: External Aero GUI External vehicle aerodynamics wizard General purpose CFD interface UHTM, HVAC, cabin comfort, powertrain, CAA…
  20. 20. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. General CFD Interface > CFD Process Process Tabs
  21. 21. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. General CFD Interface > Main Features › Control and execute helyxhexMesh utility › Specify all mesh parameters for the model: − Base mesh size − Local surface and mesh refinements − Near-wall layers › Import meshes from other tools › Specify all CFD parameters for the model: − Modelling approach − Turbulence model − Material properties − Boundary conditions − Solver controls › Initialise flow fields › Execute solvers › Monitor solution parameters: − Force coefficients − Surface / volume reports − Probes, etc › Visualise results or export to other visualisation tools
  22. 22. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  23. 23. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Adjoint > Key Features › Add-on solver module for ELEMENTS developed by ENGYS › Unique continuous adjoint formulation for topology and shape optimisation › Multi-objective support › Incompressible and compressible flow › RANS and time-averaged DES/LES › 2nd order accuracy for adjoint advection › Turbulence handling (frozen, S-A, k-e) › MRF and porous media support › Immersed boundary for topology interface tracking › Fully validated and deployed in industrial settings since 2009  VW, Audi, BMW, Volvo, Subaru, etc.
  24. 24. › CFD computation: v, p → primal fields › Adjoint CFD computation: u, q → “dual” fields › Computation of sensitivities: − Surface sensitivities → − Volume sensitivities → © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Adjoint > Continuous Formulation v u Othmer, C. The Adjoint Method Hits the Road [2014]
  25. 25. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Adjoint > Sensitivities Surface Sensitivities = 𝝏𝑱 𝝏𝜷 Volume Sensitivities = 𝝏𝑱 𝝏𝜶 red → push surface in blue → push surface out → max. mass flow 𝜕𝐽 𝜕𝛽 → min. drag𝜕𝐽 𝜕𝛽 Othmer, C. The Adjoint Method Hits the Road [2014] red → free volume cells blue → penalise volume cells → min. pressure drop 𝜕𝐽 𝜕𝛼 → max. flow uniformity 𝜕𝐽 𝜕𝛼
  26. 26. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Adjoint > Topology Optimisation › Specify design space and inlet/outlet interfaces › Define optimisation objectives › Calculate volume sensitivities − Volume cells penalised according to objective function − Track “optimum” interface with level-set immersed boundary › Output “smooth” surface optimised shape › Single flow simulation → min. pressure drop 𝜕𝐽 𝜕𝛼 → max. flow uniformity 𝜕𝐽 𝜕𝛼
  27. 27. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Adjoint > Shape Optimisation › Based on RANS or time-averaged DES/LES results › Define optimisation objectives › Compute surface sensitivities › Morph mesh/surface to reach optimal solution (neutral state) → max. mass flow 𝜕𝐽 𝜕𝛽 → min. drag𝜕𝐽 𝜕𝛽
  28. 28. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  29. 29. › CFD benchmark performed by Volvo › Comparison wind tunnel vs. CFD codes vs. ELEMENTS › Multiple configurations tested: © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > Overview Configuration V60 S60 XC90 Open cooling (Baseline) X X X Closed cooling (by taping) X X X Closed cooling (by shutters) X Removed front wheel deflectors X X X Added planar rim covers X X Removed underbody type panels X Added separation edge between roof spoiler & D-pillar X Volvo V60 (MY2010) Volvo XC90 (MY2016) Volvo S60 (MY2010) Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring).
  30. 30. › On-road conditions › Moving ground: − 1x centre belt − 4x scalable wheel drive units › Boundary layer control: − Boundary layer scoop − Floor mounted suction (2 zones) − Tangential blowing › Test velocity → 140 km/h › Test yaw → 0° © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > Wind Tunnel Setup Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). Volvo Car Corporation Wind Tunnel (PVT)
  31. 31. › All meshes and solver runs performed in ELEMENTS › Automatic hex-dominant parallel meshing with best practices for external aero › Transient incompressible flow analysis → DDES-SA › Velocity → 140 km/h (38.89 m/s) @ 0° yaw › Condenser, radiator & intercoolers (Darcy-Forchheimer) › Cooling fans (rotating wall velocity) › Moving ground with rotating wheels (moving walls) › Ignored thermal effects (cold flow) © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CFD Setup Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring).
  32. 32. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CDxA Results V60 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CDxA normalised w.r.t. Baseline(PVT)
  33. 33. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CDxA Results S60 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CDxA normalised w.r.t. Baseline(PVT)
  34. 34. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CDxA Results XC90 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CDxA normalised w.r.t. Baseline(PVT)
  35. 35. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CLRxA Results V60 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CLRxA normalised w.r.t. Baseline (PVT)
  36. 36. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CLRxA Results S60 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CLRxA normalised w.r.t. Baseline (PVT)
  37. 37. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Volvo Aero Benchmark > CLRxA Results XC90 Hejdesten, M., Sebben, S. A CFD Benchmark for Improved Accuracy of Aerodynamics Simulations. 2017 JSAE Annual Congress (Spring). CLRxA normalised w.r.t. Baseline (PVT)
  38. 38. › DES transient aerodynamics analysis performed in ELEMENTS › Open cooling geometry › Open road conditions › Verify best CFD simulation practices for accurate prediction of drag/lift › Comparison to wind tunnel and commercial CFD codes (not shown here) © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > CRF - FIAT FIAT Bravo Aero > Overview With kind permission of CRF
  39. 39. › Automatic hex-dominant parallel meshing with embedded best practices for external aero › Localised volume refinements to resolve wake and other important areas › Near-wall layers to model boundary layer flow › Zonal meshing to capture porous regions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > CRF - FIAT FIAT Bravo Aero > CFD Mesh With kind permission of CRF
  40. 40. › Transient incompressible flow analysis → DDES-SA › Velocity → 140 km/h (38.89 m/s) › Condenser, radiator & intercoolers (Darcy-Forchheimer) › Moving ground with rotating wheels (moving walls) › Ignored thermal effects (cold flow) © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > CRF - FIAT FIAT Bravo Aero > CFD Setup With kind permission of CRF
  41. 41. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > CRF - FIAT FIAT Bravo Aero > Underhood Velocities intercooler condenser radiator With kind permission of CRF
  42. 42. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > CRF - FIAT FIAT Bravo Aero > Results CD and CL Coefficients Value CD CFD CD Wind Tunnel 1.0262 CL CFD CL Wind Tunnel 1.1642 Coefficients are normalised w.r.t. FIAT Wind Tunnel test measurements for FIAT Bravo configuration With kind permission of CRF
  43. 43. › Evaluation of ELEMENTS for CAA › Assessment of external aerodynamics noise acting on driver’s side window › Compressible iDDES Spalart-Allmaras › ASX SUV model @ 100 km/hr › Multiple probes (microphones)distributed on side window › Acoustic signal range between 250 Hz and 5000 Hz © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > MMC ASX External CAA > Overview With kind permission of Dr. Okutsu (MMC)
  44. 44. › Automatic hex-dominant parallel meshing with best practices for external aero › Added localised mesh around side-window area refinements to resolve all frequencies of interest › Employed original STL geometry without need for cleaning or preparation © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > MMC ASX External CAA > CFD Mesh With kind permission of Dr. Okutsu (MMC)
  45. 45. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > MMC ASX External CAA > PFL ⅓-Octave-Bands fm ≈ 500 Hz fm ≈ 4000 Hz With kind permission of Dr. Okutsu (MMC)
  46. 46. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > MMC ASX External CAA > Pressure @ f = 250 to 750 Hz Aerodynamic pressure fluctuations travelling at ~30m/s Acoustic Wavelength @ 750 Hz  l ≈ 45 cmWith kind permission of Dr. Okutsu (MMC)
  47. 47. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > MMC ASX External CAA > Pressure @ f = 4000 to 5000 Hz Acoustic Wavelength @ 5000 Hz  l ≈ 7 cm Acoustic waves travelling at the speed of sound Aerodynamic pressure fluctuations travelling at ~30m/s With kind permission of Dr. Okutsu (MMC)
  48. 48. › Compare in-cabin comfort flow parameters between designs › Two HVAC configurations: − With dashboard diffuser − Without dashboard diffuser › Steady-state CFD analysis in ELEMENTS starting from raw CAD © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > Overview Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  49. 49. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > Design Configurations CASE 1: No Diffuser CASE 2: Diffuser Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  50. 50. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > Surface Wrapping Fully Automatic Surface Wrapping Holes found in STL geometry are detected and closed automatically during meshing using our unique surface wrapping technology Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  51. 51. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > CFD Mesh Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  52. 52. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > Surface Temperatures CASE 1: No Diffuser CASE 2: Diffuser Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  53. 53. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > Ferrari FF Type Cabin HVAC > Near-wall Velocity CASE 1: No Diffuser CASE 2: Diffuser Special thanks to E. Cardile (Ferrari) - 5th European Workshop - Mobile Air Conditioning and Vehicle Thermal Systems (2013)
  54. 54. › Intake port modification for improved flow mixing › Integrated shape/topology CFD based optimiser › Multi-objective: − Pressure loss reduction − Swirl increase in target volume − Modification localised to port-arms © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Topology Optimisation > Engine Port Setup de Villiers, E. and Othmer, C. Multi-Objective Adjoint Optimization of Intake Port Geometry. SAEWC 2012 Swirl zone Volume objective
  55. 55. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Topology Optimisation > Engine Port Results de Villiers, E. and Othmer, C. Multi-Objective Adjoint Optimization of Intake Port Geometry. SAEWC 2012 Design Candidates →
  56. 56. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Topology Optimisation > Engine Port Design Process Othmer, C. The Adjoint Method Hits the Road (2014) [F. Kunze and R. Niederlein] Packaging space definition in CAD Final (hand-made) CAD GeometryDrafting with ELEMENTS-Adjoint Fine tuning with ELEMENTS-Adjoint ELEMENTS-Adjoint + manual CAD iterations
  57. 57. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Topology Optimisation > Other Examples Othmer, C. The Adjoint Method Hits the Road (2014) [M. Towara] [M. Tomecki] [C. Ehlers, K. Arntz] [U. Giffhorn] [N. Peller] [U. Giffhorn] [R. Niederlein]
  58. 58. › Objective → Minimise drag › Low-Reynolds mesh (y+ ~ 1) › Primal → RANS with Spalart-Allmaras › Adjoint → Adjoint Spalart-Allmaras › 4 cases tested by morphing different areas of the car › 2 of the cases verified in the wind tunnel © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Shape Optimisation > VW XL1 External Aerodynamics Othmer, C. The Adjoint Method Hits the Road (2014)
  59. 59. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Shape Optimisation > VW XL1 Results Othmer, C. The Adjoint Method Hits the Road (2014) -0,9% / +1,2% for 10mm displacement Confirmed in wind tunnel -0,13% / +0,14% for 5mm displacement -0,6% / +0,8% for 5mm displacement -0,8% / +1% for 10mm displacement Confirmed in wind tunnel 1 2 3 4 Morphing according to / opposite to sensitivities
  60. 60. › Experimentally validate QTA − FKFS quarter scale wind-tunnel model › Do not implement “known” improvement measures › Only modify upper body › Only outward displacement − Does not reduce packaging space › Primal → Time-averaged DES › Adjoint → Adjoint Spalart-Allmaras © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Shape Optimisation > Audi Q5 External Aerodynamics Reproduced with kind permission of Thomas Blacha, Audi AG - SAE TP 2016-01-1615
  61. 61. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Shape Optimisation > Audi Q5 Results Reproduced with kind permission of Thomas Blacha, Audi AG - SAE TP 2016-01-1615
  62. 62. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Success Stories > VW Group Adjoint Shape Optimisation > Other Examples red: inwards for low drag blue: outwards for low drag Othmer, C. The Adjoint Method Hits the Road (2014)
  63. 63. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  64. 64. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Upcoming Features › New client-server GUI framework › New meshing technology with improved quality and near-wall layer coverage › Improved turbulence models for external aerodynamics → new implementation of S-A and kw-SST › Improved modelling of rotating wheels → testing generalised internal boundaries (GIB) and ACMI › Improved modelling for aero-acoustics → acoustic propagation equation (APE) › Surface morphing (automatic / parametric) › All other CFD capabilities delivered with HELYX®
  65. 65. › DrivAer (TU Munich) → 37 million cells – 6 near-wall layers © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Upcoming Features New Dualised Meshing Approach
  66. 66. › New 3D Rendering engine › Fully synchronous remote execution › Interactive graphical visualisation of results directly on the server side › Support for different queue system drivers, incl. PBS, LSF and SLURM › HPC / cloud ready © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. ELEMENTS Upcoming Features Client-Server Local Cloud Remote SSH
  67. 67. 1. ELEMENTS Overview 2. Aero Wizard GUI 3. General CFD GUI 4. ELEMENTS Adjoint 5. Success Stories 6. Developments 7. Conclusions © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. CONTENTS
  68. 68. © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION. Why ELEMENTS? › Enterprise CFD solution › Minimal CAD clean-up › Advanced, automatic parallel meshing › Fully validated DES methods › Highly accurate → WLTP compliant › Open-source solvers → scalable, fast and efficient › Easy to learn and use › Multi-platform (Linux and Windows) › Best-in-class user support › Cost effective
  69. 69. Disclaimer ENGYS is the proprietor of the copyright subsisting in this work. No part of this work may be translated, reprinted or reproduced or utilised in any material form either in whole or in part or by any electronic, mechanical or other means, now known or invented in the future, including photocopying and recording, or in any information storage and retrieval system, without prior written permission from ENGYS. Applications for permission to reproduce any part of this work should be addressed to ENGYS at info@engys.com © Copyright 2017 ENGYS Limited. All rights reserved. NOT FOR DISTRIBUTION.

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