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Fluid mechanics
Fluid mechanics

Turbulence Models for Typical CFD Scenarios

Theory and Application

Overview

Training Expert

This training course teaches the fundamentals of turbulence modeling and uses four practical examples to demonstrate how the models can be implemented. This training is offered as a 3-day course.

Duration
3 days

Prerequisites
Basic knowledge of Ansys CFD

Software used
Ansys CFD

Benefits
  • Understand the mathematical description of turbulent flows
  • Estimate the cost-benefit ratio of different turbulence models
  • Use turbulence models in CFD simulation software
  • Assess the plausibility of results of turbulent flow calculations

Description

The majority of practically every relevant flow is turbulent. Knowledge of turbulence models and their use in simulation processes is necessary to simulate turbulent flows with the required industrial accuracy.

This training course conveys the fundamentals of turbulence modelling and demonstrates the use of turbulence models with practical examples. You learn the mathematical description of turbulent flows and can estimate the cost-benefit ratio of various turbulence models. Within this course, you have practiced the use of turbulence models in a CFD simulation software. Therefore, you know what to look out for when evaluating results and can draw meaningful conclusions from your simulations. You can assess the plausibility of results of turbulent flow calculations.

This training course is aimed at development and simulation engineers, researchers, and project managers, who deal with turbulent flows in their work and want to calculate them precisely.

Detailed agenda for this 3-day training

Day 1

01 Mathematical description of turbulent flows

  • Definition of turbulent flows
  • Technical relevance
  • Properties of turbulent flows – turbulence syndrome
  • Predictability of turbulent flows
  • Statistical treatment of turbulent flows
  • Correlations

02 Eddy viscosity turbulence models

  • Statistical averaging – RANS equations
  • Closure problem of turbulence
  • Turbulence models – definition & purpose
  • Turbulence models in Ansys CFD – overview
  • Eddy viscosity hypothesis & models
  • Turbulent kinetic energy equation – discussion & modeling

03 Workshop: separating diffusor flow

  • Geometry definition
  • Computational meshes – design & quality
  • Boundary and initial conditions
  • Discretization schemes, convergence control & criteria
  • Post-processing
  • Comparison to data
  • Iteration and discretization error quantification
  • Use of Ansys CFX and Fluent

04 Two-equation eddy-viscosity models

  • Turbulent kinetic energy cascade
  • Choice of turbulent length scale variables
  • Modelling of dissipation rate conservation equation
  • k-ε turbulence model
  • k-ε turbulence model – strengths & limitations
  • k-ω turbulence model

Day 2

05 Near-wall turbulent flows

  • Thin shear layer equations for turbulent flows
  • Wall-bounded turbulent flows
  • Viscous sublayer & fully-turbulent near-wall zone
  • Velocity profiles – wall vicinity
  • Temperature profiles – wall vicinity
  • Turbulence properties in wall shear layers

06 Workshop: duct flows

  • CFD best-practice workflow
  • Fully-developed duct flow – theory
  • Definition of target quantities
  • Model selection
  • Computational meshes
  • Boundary and initial conditions
  • Solver settings
  • Post-processing & analysis
  • Comparison to correlations and empirical wall laws
  • Evaluation of different wall models
  • Use of Ansys CFX and Fluent

07 Modern two-equation turbulence models

  • Blended k-ω/k-ε turbulence models – concept
  • BSL turbulence model
  • Blending functions
  • SST turbulence model
  • GEKO turbulence model
  • Model extension - streamline curvature
  • Model extension - laminar-turbulent transition

08 Boundary conditions

  • Finite volume mesh arrangements: vertex-centered – CFX & cell-centered – Fluent
  • Wall functions – purpose
  • Wall functions – velocity, temperature & turbulence quantities
  • “Automatic” wall functions
  • Near-wall mesh considerations
  • Inlet boundary conditions

Day 3

09 Turbulent heat transfer

  • Energy conservation
  • Reynolds-averaged energy equation
  • Eddy diffusivity model
  • Transport equations for turbulent scalar fluxes
  • Limitations of eddy diffusivity models
  • Modelling of turbulent scalar flux equations

10 Workshop: heat transfer

  • Impinging jet with heat transfer
  • Definition of target quantities
  • Model selection
  • Computational mesh requirements
  • Boundary and initial conditions
  • Solver settings
  • Post-processing, quality and plausibility checks
  • Comparison to data
  • Practical exercises with Ansys CFX and Fluent

11 Reynolds stress models and second-moment closures

  • Shortcomings of eddy viscosity models
  • Exact Reynolds stress equations
  • Reynolds stress models
  • Redistribution terms. return-to-isotropy & rapid
  • Algebraic stress models
  • Workshop - curved boundary layer

12 Scale-resolving turbulence models

  • Scale-resolving models – definition
  • LES models – principle
  • Subgrid scale models – Smagorinsky
  • Hybrid turbulence models – principle
  • DES & SBES turbulence models
  • SAS turbulence model

Your Trainers

Dr.-Ing. Georg Scheuerer
CEO, ISimQ
Malte Küper
Consulting & Service, CADFEM (Austria) GmbH, Innsbruck

Placement in the CADFEM Learning Pathway

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Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

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As long as a coures still has free places, it can be booked.

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Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

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