About the Workshop

Following the success of the previous two workshops (Oxford, 2019 and Berlin, 2021), we’re proud to announce that the 3rd Automotive CFD Prediction Workshop (AutoCFD 3) will be held in 2022, in person, in Barcelona, Spain.


The main objective of the 3rd Automotive CFD Prediction Workshop is to assess the predictive capability of CFD codes for road-cars geometries. Through mandatory geometry, boundary conditions and computational grids the aim is to provide practical modelling guidelines to the automotive community e.g best-practice turbulence modelling, meshing, numerical schemes. In addition we want to bring the automotive CFD community (both academia and industry) together to discuss future directions.

Computing the test-cases is not required to attend the workshop but we strongly encourage everyone to consider submitting results. Full details of the test-cases will be available shortly.

If you wish to participate please fill in the form here or e-mail admin@autocfd.org so a submission ID can be assigned.

Our data policy can be found here.

Dates

Deadline for notice of participation : March 31st 2022 (extended)
Kick-off meeting (virtual): March 10th 2022 (10am CET and 6pm CET)
Deadline for data submission : 12th August 2022
Workshop : 22nd and 23rd September 2022
** join the mailing list or e-mail admin@autocfd.org to receive details of how to attend the call

Who Should Attend?

CFD Engineers, Aerodynamicists, Academics from Automotive OEMs, start-ups, software companies, academics from around the world

When and where?

22-23rd September 2022 - Barcelona,Spain

Contact

Please contact the workshop organisers admin@autocfd.org to sign up and any queries about the test-cases/technical issues

Test Cases

Case 1 is the Windsor Squareback body at 2.5 degrees yaw. In comparison to the second workshop, the test case has been simplified to be just the original no wheels model and to only require meshes with a high y+ and a wall function type boundary condition. The problem is at a Reynolds number of 3 million based on vehicle length and is within a wind-tunnel like domain. As well as force, moment and surface pressure data, there is also available non intrusive PIV measurements in the wake. The baseline grid is similar to the ‘eddy resolving’ grid from the second workshop and contains 37 million cells. The alternate grids halve and double the core cell size to give 7 million and 197 million cell grids. The grid type follows the second workshop using the ‘trimmer mesh’ and prism layer approach from Simcenter STAR-CCM+. The test description can be found here . Grids are available in a variety of formats below.


Grids


Case 1 - surface grids Windsor body (STL) Windsor body (JT) Windsor pins (STL) Windsor pins (JT)
Case 1 - Coarse Grids CGNS OpenFOAM Fluent STAR-CCM+
Case 1 - Medium (baseline) grids CGNS OpenFOAM Fluent STAR-CCM+
Case 1 - Fine grids CGNS OpenFOAM Fluent STAR-CCM+

Case 2 is the notchback version of the DrivAer. Beside the base variant of the DrivAer (Case 2a) which has been analyzed in the 2nd Automotive CFD Prediction Workshop a variant of the DrivAer (Case 2b), which features a front wheel air deflector, has been proposed for the 3rd workshop. A detailed description of both DrivAer test cases is available here and, for the base variant, from the SAE Technical Paper 2021-01-0958 by Hupertz et al.. For both DrivAer variants the workshop will focus on a closed cooling configuration with static wheels and static floor. A comprehensive set of experimental data from the Pininfarina Wind Tunnel (Courtesy of Ford) including aerodynamic forces, surface pressure, velocity profiles and 2D flowfield measurements will be available for both DrivAer variants for the correlation of CFD analyses presented at the workshop. Please see below for the meshes which were created using ANSA by BETA-CAE Systems. The mesh of the base variant (Case 2a) is identical to the “Case 2 – Wall-Function Grid” used in the 2nd workshop. The Case 2b mesh is identical to the Case 2a mesh except for the front wheel air deflector region. The post-processing excel spreadsheet to enter your results can be found here . Also the grid files for flowfield mapping in ANSA and Nastran format can be found here (coming soon).

Grids


Case 2a - Surface meshes STL ANSA JT Nastran
Case 2b - Surface meshes STL ANSA JT Nastran
Case 2a - Wall-Function Grids CGNS OpenFOAM Fluent CFD++ Mesh statistics
Case 2b - Wall-Function grids CGNS OpenFOAM Fluent CFD++

Submission guidelines

Please e-mail your submission to admin@autocfd.org including your submission ID (which you should have been e-mailed). If the file is too large for e-mail, please include a link to a file transfer service or contact admin@autocfd.org for us to arrange access to one for you.


Agenda

Agenda will be available closer to the workshop

Presentations

Presentations and videos (where available) will be made available after the workshop.

Workshop Organisers

  • Oriol Lehmkuhl (Barcelona Supercomputing Center) - Local Organiser
  • Herbert Owen (Barcelona Supercomputing Center) - Local Organiser
  • Gary Page (Loughborough University)
  • Neil Ashton (Amazon Web Services / University of Oxford)
  • Burkhard Hupertz (Ford)
  • Charles Mockett (Upstream CFD)
  • Lian Duan (Ohio State University)
  • Timo Kuthada (FKFS)
  • Simone Sebben (Chalmers University)
  • Charles Ribes (Stellantis)
  • Iraj Mortazavi (CNAM)
  • Vangelis Skaperdas (BETA-CAE Systems)
  • Martin Passmore (Loughborough University)
  • Adrian Gaylard (Jaguar Land Rover)
  • Astrid Walle (CFD Solutions)

Registration and payment

Full details on registration will be made available closer to the workshop

1st Workshop

The 1st Automotive CFD Prediction Workshop was held on the 11-12th December 2019 in Oxford at St Anne's College. Three test-cases were studied; SAE Notchback geometry, DrivAer Fastback and DrivAer Estate vehicle which are described below Meshes were created for all cases in major grid formats i.e OpenFOAM, STAR-CCM+, Fluent, CGNS in addition to geometry and surface meshes. Participants who submitted results were allocated a 15 minute presentation slot however those who wished to present relevant material (i.e wind-tunnel campaign of the DrivAer model) without computing the test-cases were allowed to speak.

Three test-cases were available for participants to compute and submit to the workshop organisors to crossplot and summarize. Each participant who computes these cases will be given a 15 minute presentation slot to discuss their results. Full descriptions of these cases; SAE Notchback (Case 1 ), DrivAer Fastback (Case 2a ) and DrivAer Estate (Case 2b ) are available in prior links with geometry, surface meshes and volume meshes available to download the table below. Meshes in all the major mesh formats i.e OpenFOAM, STAR-CCM+, Fluent, CGNS. Participants were encouraged to run the coarse, medium and fine meshes to demonstrate mesh convergence where possible.

Grids


Case 1 - geometry STL STL STEP PRT IGS
Case 1 - Grid for DES-type simulations CGNS STAR-CCM+ OpenFOAM Fluent
Case 1a - Grid for RANS-type simulations CGNS STAR-CCM+ OpenFOAM Fluent
Case 1a - BETA-CAE Participant ANSA grids - coarse STAR-CCM+ OpenFOAM Fluent
Case 1a - BETA-CAE Participant ANSA grids - medium STAR-CCM+ OpenFOAM Fluent CGNS
Case 1a - BETA-CAE Participant ANSA grids - fine STAR-CCM+ OpenFOAM Fluent CGNS
Case 2a - Surface meshes STL STEP
Case 2a - coarse Grids CGNS OpenFOAM Fluent STAR-CCM+
Case 2a - medium grids CGNS OpenFOAM Fluent STAR-CCM+
Case 2a - fine grids CGNS OpenFOAM Fluent STAR-CCM+
Case 2b - Surface meshes STL STEP
Case 2b - coarse Grids CGNS OpenFOAM Fluent STAR-CCM+
Case 2b - medium grids CGNS OpenFOAM Fluent STAR-CCM+
Case 2b - fine grids CGNS OpenFOAM Fluent STAR-CCM+

Experimental data for Case 1 was made available here which has the data itself and some instructions. Please refer to the main test-case description for complete information.

Final Agenda for the workshop is here:

Presentations from the 1st workshop are below

Case 1 - Test-Case Description, Meshing and Cross-Plotting Results - Loughborough University /Organisers
Case 2 - Mesh Generation - BETA-CAE Systems/Organisers
Case 2 - Cross-plotting- University of Oxford/BETA-CAE/Organisers
001 - Oxford/BETA-CAE/AWS
007 - ANSYS
011 - Barcelona Supercomputing Centre
012 - Metacomp
013 - Imperial College London
015 - Linköping University
020 - Siemens
022 - The Ohio State University
025 - PSA
026 - upstreamCFD
029 - University of Sydney

1st workshop organisers

* Neil Ashton (University of Oxford) * Gary Page (Loughborough University) * Vangelis Skaperdas (BETA-CAE Systems) * Owen Sinclair (University of Oxford) * William Van Noordt (University of Oxford) * Agata Dybisz (University of Oxford) * Martin Passmore (Loughborough University)

The organisers are grateful to Amazon Web Services for sponsoring this workshop. The organisers would also like to thank the UK Fluids Network and the Ground Vehicle Aerodynamics Special Interest Group (a EPSRC project funded under grant agreement EP/N032861/1) for early discussions on this workshop. In addition members of the UK Automotive Aerodynamics Forum have also given very useful input on the workshop.

2nd workshop

The 2nd Automotive CFD Prediction Workshop was held on the 26th-27th August 2021 in a hybrid format - virtually and in Berlin, Germany. It was preceded by the Fourth International Conference in Numerical and Experimental Aerodynamics of Road Vehicles and Trains (AEROVEHICLES 4 ), and both the conference and workshop were held during the same week. Two test-cases were studied; Windsor body and the DrivAer Notchback (detailed underbody with no rolling road or rotating wheels). Meshes were created for all cases in major grid formats i.e OpenFOAM, STAR-CCM+, Fluent, CGNS in addition to geometry and surface meshes. Participants who submitted results were allocated a 15 minute presentation slot however those who wished to present relevant material (i.e wind-tunnel campaign of the DrivAer model) without computing the test-cases were allowed to speak.

Case 1

Case 1 is the Windsor Body, which is a simplified vehicle like shape in wind tunnel conditions and is intended to capture the important flow-field structures without needing to model complex geometrical detail as is found in the second DriVAer case. The Windsor model, as developed by Steve Windsor of Jaguar Land Rover, used here has been modified to include a version with wheels. Further details are given in the (paper ) by Pavia et al. and the PhD thesis of Varney. These two cases have had extensive measurements taken at the Loughborough University wind tunnel at a Reynolds number of approximately 3 million (based on vehicle length). The full dataset is available here.

Two CAD definitions are provided for the with wheels (1A) and without wheels (1B) geometry. For each case, four standard meshes will be provided in a range of grid formats: low Re wall resolved RANS (WRRANS), wall modelled RANS (WMRANS), low Re wall resolved Eddy Resolving (WRER), wall modelled Eddy Resolving (WMER). For the WRER case, the high aspect ratio near the wall makes this suitable for DES and hybrid RANS-LES approaches, and it is not recommended to be used for a classic eddy resolving LES. A detailed description of the test case is available here (Version v0.5 - 18th June) and the kick off presentation slides here. . Links can also be found below for the post-processing instructions and an example set of files/templates to use for your submission.

Grids


Data Submission Instructions Example files/template
Case 1a - geometry STL STL
Case 1a - low Re wall resolved RANS (WRRANS) CGNS STAR-CCM+ OpenFOAM Fluent
Case 1a - wall modelled RANS (WMRANS) CGNS STAR-CCM+ OpenFOAM Fluent
Case 1a - low Re wall resolved Eddy Resolving (WRER) CGNS (v2) STAR-CCM+ OpenFOAM (v2) Fluent (v2)
Case 1a - wall modelled Eddy Resolving (WMER) CGNS (v2) STAR-CCM+ OpenFOAM (v2) Fluent (v2)
Case 1b - geometry STL STL
Case 1b - low Re wall resolved RANS (WRRANS) CGNS (v2) STAR-CCM+ OpenFOAM (v2) Fluent (v2)
Case 1b - wall modelled RANS (WMRANS) CGNS (v2) STAR-CCM+ OpenFOAM (v2) Fluent (v2)
Case 1b - low Re wall resolved Eddy Resolving (WRER) CGNS STAR-CCM+ OpenFOAM Fluent
Case 1b - wall modelled Eddy Resolving (WMER) CGNS STAR-CCM+ OpenFOAM Fluent

Case 2

Case 2 is the notchback version of the open cooling DrivAer. A detailed description of the open cooling DrivAer test case is available here (Version v6 - 6th July) and from the SAE Technical Paper 2021-01-0958 by Hupertz et al.. The workshop will focus on a closed cooling DrivAer configuration with static wheels and static floor. A comprehensive set of experimental data from the Pininfarina Wind Tunnel (Courtesy of Ford) including aerodynamic forces, surface pressure, velocity profiles and 2D flowfield measurements will be available for the correlation of CFD analyses presented at the workshop. Please see below for the meshes which were created using ANSA by BETA-CAE Systems. The post-processing excel spreadsheet to enter your results can be found here (Version v15 - 6th July). Also the grid files for flowfield mapping in ANSA and Nastran format can be found here (Version v1 - 21st June).

Grids ( Readme )


Case 2 - Surface meshes STL ANSA JT Nastran
Case 2 - Wall-Function Grids CGNS OpenFOAM Fluent CFD++ Mesh statistics
Case 2 - low y+ grids CGNS OpenFOAM Fluent CFD++ Mesh statistics

Final Agenda for the workshop is here:

Presentations from the 2nd workshop are below

Presentations and videos (where available) from the 2nd automotive workshop are shown below. They were presented according to the agenda here .
Workshop kick-off - Neil Ashton (AWS)
Case 1 description and cross-plotting - Gary Page (Loughborough University) - Video-Case-Desc,Video-Cross-Plotting1 ,Video-Cross-Plotting2,Video-Cross-Plotting3
Case 2 description and cross-plotting - Burkhard Hupertz (Ford Motor Company) - Video-Case-Desc ,Video-Cross-Plotting1,Video-Cross-Plotting2 ,Video-Cross-Plotting3
Case 2 meshes - Vangelis Skaperdas (BETA-CAE Systems) - Video
Statistical error quantification - Charles Mockett (Upstream CFD)
Emmanuel Guilmineau - CNRS - Centrale Nantes - Video
Eugen Riegel - Numeric Systems GmbH
Marian Zastawny - Siemens Digital Industries Software- Video
Olivier Thiry - Cadence Design Systems
Hendrik Hetmann - Upstream CFD - Video
Francesco Fabio Semeraro - Politecnico di Milano
Samuel Gomez - Barcelona Supercomputing Center - Video
Walid Hambli - Imperial College London
Date Rentema - DAF Trucks
Christian Taucher - ICON Technology and Process Consulting Ltd.
Astrid Walle - Astrid Walle CFDsolutions
Gary Page - Loughborough University
Neil Lewington - Ford Motor Company
Lian Duan - The Ohio State University
Matthew Kronheimer - TotalSim US
Michael Emory - Cascade Technologies, Inc. - Video
Paul Batten - Metacomp Technologies, Inc. - Video
Liang Yu - University of Sydney
Arjun Yadav - Digital Solutions Inc. - Video
Shijun Chu - Tongji University - Video
Krishna Zore - ANSYS
Kaushik Reddy Mallareddygari - SankhyaSutra Labs Ltd.
Ondrej Cavoj - Skoda Auto + Brno University
Neil Ashton - Amazon Web Services - Video

2nd workshop organisers

* Charles Mockett (Upstream CFD) - **Local Organiser** * Gary Page (Loughborough University) * Neil Ashton (Amazon Web Services / University of Oxford) * Burkhard Hupertz (Ford) * Lian Duan (Ohio State University) * Timo Kuthada (FKFS) * Simone Sebben (Chalmers University) * Charles Ribes (Stellantis) * Iraj Mortazavi (CNAM) * Vangelis Skaperdas (BETA-CAE Systems) * Martin Passmore (Loughborough University) * Adrian Gaylard (Jaguar Land Rover) * Fabian Rösler (Audi) * Marco Kiewat (Audi) * Astrid Walle (CFD Solutions)