Open enrollment training

Applied LES, DES and URANS for Industry

The industry has started to introduce time-dependent numerical simulation such as large eddy simulation (LES), unsteady RANS or hybrid approaches such as DES in their development process. The advantage of these techniques is much higher accuracy of the prediction compared with steady RANS simulations but also possibility to replace costly physical testing and simulate flow situations where experiments are difficult or impossible. Although most commercial (and open source) CFD software have option to run unsteady methods, their usage requires knowledge in running unsteady simulations which puts different requirements than steady RANS on all steps of the process. Being resolving techniques, these techniques put higher requirements on all steps in the project, from the quality of the computational grids, numerical discretization, performing the CFD simulation to analysis of large amount of data obtained from a time-dependent simulation.

This aim of this course is to equip an engineer or researcher with the knowledge to run unsteady CFD simulations for the application of his interest. After the course, the participant will be able to:

- choose the adequate unsteady technique

- prepare computational grid for that is required for the chosen technique

- chose appropriate spatial and temporal discretization and other parameters in the simulation

- run the simulation and do appropriate monitoring of the results

- postprocessor the results and evaluate the quality of the achieved prediction

We will start with introduction in how time-dependent techniques such as Large-Eddy Simulations (LES), Detached-Eddy Simulations (DES), Partially-Averaged Navies-Stokes (PANS) and unsteady RANS (URANS) can be used in vehicle aerodynamics. We will discuss differences between these techniques and give best practical guidelines for usage of each technique. We will show when each of the techniques could/should be used and how to use it.

We believe that the course is useful for engineers and researcher in all industrial sectors where unsteady flows are of importance. The practical example that we will study during the course come from vehicle aerodynamics and bluff body aerodynamics but the method is by no means limited to these two fields. The same methodology can be used in many other industrial fields where separated and unsteady flows occur.

The course will cover three important applications of CFD techniques in industry: prediction using unsteady CFD simulations (LES, DES, PANS, URANS), CFD for flow control and aerodynamic shape optimization.

Agenda

PRELIMINARY PROGRAM

DAY 1 (9.00 -- 17.00)

09.00-12.00  Introductions to time-dependent numerical techniques for vehicle aerodynamics LES, URANS, DES, PANS, numerical aspects, modeling, grids etc.
12.00-13.00  Lunch
13:15-17:00  Workshop: Implementation of LES for external vehicle aerodynamics

DAY 2 (9.00 -- 17.00)
09.00-10.00 CFD for flow control.
10.00-12.00 Workshop: Application of LES and PANS for active flow control.
12.00-13.00 Lunch 13.15-15.00 Active flow control, passive flow control.
15.15-17.00 Workshop: Application of LES and PANS for active flow control. 18:30 Course dinner

DAY 3 (9.00 -- 17.00)

09.00-10.00 Aerodynamic shape optimization of vehicles using CFD.
10.00-12.00 Workshop: Optimization of vehicle shapes using RANS and URANS, response surfaces, neural networks and genetic algorithms.
12.00-13.00 Lunch
13.15-15.00 Optimization using surrogate-based modeling, automatic shape optimization.
15.15-17.00 Workshop: Optimization of vehicle shapes using RANS and URANS, response surfaces, neural networks and genetic algorithms.

Computer Workshops

The course consists of one theoretical and one practical part. The practical part contains three computer exercises. The flow cases used in our exercises are taken directly from our research which makes the exercises realistic and thus more relevant for participants than pure academic simplified cases.

For the description of the computer exercises please see:

http://sinisa-aerodynamics.se/courses-training-2/computer-exercises/


 

 

 

 


 

 

 

Teacher and instructor

The lectures and the workshops will be given by Professor Krajnovic form Chalmers University in Gothenburg, Sweden. Professor Krajnovic pioneered the use of Large Eddy Simulation (LES) technique for the study of vehicle aerodynamics flows. He has written widely on application of unsteady simulations such as LES and hybrid approaches (such as Detached Eddy Simulation (DES) and Partially-Averaged Navier Stokes (PANS)) in aerodynamics of road vehicles, trains and other bluff bodies. His current interests include: prediction of aerodynamics flows, development of hybrid numerical approaches (such as PANS), vehicle aerodynamic shape optimization and flow control.

Prof. Krajnovic is head of Vehicle Aerodynamic Laboratory at Chalmers. Established in 2009, Vehicle Aerodynamic Laboratory is devoted to fundamental and applied numerical research in vehicle aerodynamics. Education of a new generation CFD engineers and researches in vehicle aerodynamics is the core of Vehicle Aerodynamic Laboratory (http://www.tfd.chalmers.se/~sinisa/)

Organization of the course

The course is given during three days and consists of lectures and computer workshops. During the lectures we will discuss the theory and during the workshops we will learn how to prepare, run and analyze different time-dependent CFD simulations.  Furthermore, MATLAB programs will be used for aerodynamic shape optimization. There will be a PC workstation for each participant at the workshops.

Computer Workshops

The course consists of one theoretical and one practical part. The practical part contains three computer exercises. The flow cases used in our exercises are taken directly from our research which makes the exercises realistic and thus more relevant for participants than pure academic simplified cases.

For the description of the computer exercises please see:

http://sinisa-aerodynamics.se/courses-training-2/computer-exercises/


Contact

If you want more information contact Lena Henriksson.

Phone: +46 31 772 4222
Mobile: +46 704 80 81 45
E-mail: lena.henriksson@chalmers.se

Full refund of educational program/course fees will be made for reservations cancelled no later than eight weeks prior to the start of the program/course. Later cancellations incur a cancellation fee as follows:

  • 2 weeks or less prior to program start 100% of the educational program/course fee
  • 2-4 weeks prior to program start 50% of the educational program/course fee
  • 4-8 weeks prior to program start 25% of the educational program/course fee, for educations in the Shipping area: 0% of the educational program/course fee

We are always willing to consider a colleague as a substitute for the original applicant. Cancellation and postponement must be made in writing. Cancellation of accommodation is subject to the cancellation policies of the hotels.