04/15/2020

Innovative Simulations with Quality:

Workshop  on „Practical Use of Turbulence Models – Background & Application“

– also in a digital live format –

Life is sometimes turbulent; technical flows most of the time. But at least you can simulate the latter. We will show you in a seminar, which is now also available in an online digital format, how to perform turbulent flow simulations best.

High-quality simulations require knowledge of the underlying physics, of turbulence modelling and the implementation of the models in CFD codes. Such knowledge is a prerequisite for meeting the high accuracy requirements in the design and optimisation of high-technology products. The seminar, which ISimQ organises together with CADFEM, provides you with the necessary know-how and shows the practical application of turbulence models in a CFD software.

The course dates are:

• 25 – 27 May 2020, Aadorf (Switzerland) or as an online seminar
• 22 – 24 September 2020, Hannover or as an online seminar
• 10 – 12 November 2020, Renens (Switzerland) or as an online seminar
• 15 – 17 December 2020, Innsbruck (Austria) or as an online seminar

Twelve course units provide information on all relevant topics: Basics of turbulence physics, introduction to turbulence modelling, eddy viscosity models, second-moment closures (Reynolds stress models), scale-resolving turbulence models, turbulent heat and mass transfer, and boundary and initial conditions for turbulent flow simulations In parallel to the theory, the course attendees apply the models to typical turbulent flows, like wall boundary layers, diffusor flows, impinging jets and flows with recirculation.

The seminar aims at project managers, development and simulation engineers as well as at researchers who develop and optimise products in which turbulence is essential and who want to calculate the influence of turbulence on their applications using CFD methods.

Stream the seminar via a digital live format

CADFEM’s online seminars bring face-to-face seminars into a digital live format. As an attendee, you can dial into the online workshop in which the course instructor presents the seminar topics live. You can run the CFD software and perform exercises from your web browser by using the included seminar cloud. By sharing screen contents, the course instructor can answer your questions as in a face-to-face seminar.

The attendance fee for the three-day seminar is 2,055 € in Germany and Austria, and 2,230 € in Switzerland. Members of research institutes, universities and participants in mid-career training programs receive a discount of 30 %, Bachelor and Master students of 80 %.
You can register for the workshop with the link „Hintergrund und Anwendung von Turbulenzmodellen in typischen CFD-Szenarien“

Program – Day 1

09:00 – 10:30
Physics and mathematical description of turbulent flows
• Definition of turbulent flows
• Technical relevance
• Properties of turbulent flows – „turbulence syndrome”
• Simulation strategies
• Statistical treatment of turbulence

11:00 – 12:30
Introduction to turbulence modelling
• Conservation equations for averaged variables
• Closure problem of turbulence
• Parametrisation of turbulence
• Eddy viscosity hypothesis
• Classification of turbulence models

13:30 – 15:00
Two-equation turbulence models
• Turbulence models in ANSYS CFD – overview
• Turbulent kinetic energy – equation & modelling
• Length scale variables
• Model overview – k-ε-, k-ω-, SST- and BSL-models
• Strengths and weaknesses of turbulence models & model recommendations

15:30 – 17:00
Workshop – parabolic flows
• Simulation of turbulent duct flows and boundary layers
• Meshing requirements
• Boundary and initial conditions
• Solver settings
• Analysis, quality control and plausibility checks
• Comparison with data and correlations

Program – Day 2

09:00 – 10:30
Wall shear layers and wall functions
• Near-wall conservation equations
• Velocity and temperature profiles
• Profiles of turbulence variables
• Linear, logarithmic and „automatic“ wall functions
• „High-Re“- and „Low-Re“ turbulence models

11:00 – 12:30
Boundary and initial conditions for turbulent flow simulations
• Definition of turbulence intensity and eddy viscosity ratio
• Inlet boundary conditions – Boundary layers, duct and channel flows, quiescent atmosphere
• Boundary conditions – constant values & profiles
• Initial conditions and estimates
• Workshop – definition and application of inlet profiles

13:30 – 15:00
Workshop – elliptic flows
• Simulation of separating flows – diffusor flow
• Meshing requirements
• Boundary and initial conditions
• Solver settings
• Analysis, quality control and plausibility checks
• Comparison with data

15:30 – 17:00
Second-moment closures – Reynolds stress models
• Recommended applications
• Exact Reynolds stress equations
• Models for the Reynolds stress equations – turbulent transport, pressure-strain redistribution terms, dissipation rates
• Algebraic stress models

Program – Day 3

09:00 – 10:30
Workshop – Reynolds stress & algebraic stress models
• Flow in a U-duct – effect of streamline curvature
• Meshing requirements
• Boundary and initial conditions
• Solver settings
• Analysis, quality control and plausibility checks
• Comparison with data

11:00 – 12:30
Heat and mass transfer
• Statistically averaged energy, temperature and concentration equations
• Eddy diffusivity models
• Second-moment closures for turbulent scalar fluxes
• Wall heat transfer

13:30 – 15:00
Workshop – heat transfer
• Impinging jet
• Meshing requirements
• Boundary and initial conditions
• Solver settings
• Analysis, quality control and plausibility checks
• Comparison with data

15:30 – 17:00
Scale-resolving turbulence models
• Large Eddy Simulation (LES) models
• Hybrid turbulence models – SAS, DES, SBES
• Application recommendations
• Workshop – setup of scale-resolving simulations
• Closing discussion & outlook