Turbulence Models for Typical CFD Scenarios
Theory and Application
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
- 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
Malte Küper
Placement in the CADFEM Learning Pathway
Participant data
Additional information
Commentary
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