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Advanced CFD Analysis of Aerodynamics Using CFX

Outline. CFX: Advanced CFD softwareThe companyThe productsTurbulence Modells in CFXNear wall treatment in CFXExamples:Duct with adverse pressure gradientAirfoilsHeat transfer. CFX: Member of AEA Technology. CFX: Global Position. CFD (Computational Fluid Dynamics) group of AEA TechnologyLargest European CFD company210 employees8 main officesStrong industrial presenceGrowth rate approx. 25% per yearMore than 1500 installed licenses.

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Advanced CFD Analysis of Aerodynamics Using CFX

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    1. Advanced CFD Analysis of Aerodynamics Using CFX Jorge Carregal Ferreira Achim Holzwarth, Florian Menter

    2. Outline CFX: Advanced CFD software The company The products Turbulence Modells in CFX Near wall treatment in CFX Examples: Duct with adverse pressure gradient Airfoils Heat transfer

    3. CFX: Member of AEA Technology

    4. CFX: Global Position CFD (Computational Fluid Dynamics) group of AEA Technology Largest European CFD company 210 employees 8 main offices Strong industrial presence Growth rate approx. 25% per year More than 1500 installed licenses

    5. CFD-Analysis Generate geometry: fluid domain Generate mesh: discrete representation of fluid domain Solve Navier-Stokes Equiations Analyse Results Coupling: Optimisation, fluid-structure coupling, accoustic analysis, design improvements

    6. Leading Technology in CFX-5 Easy to use Pre-Processor CFX-Build based on MSC.Patran: Unstructured hybrid grids Coupled algebraic multigrid-solver (AMG): Accurate, robust and fast Solution time scales linear with grid size Excellent parallel performance Grid adaptation UNIX, NT, Linux

    7. Leading Technology in CFX-5 Laminar and turbulent flows. Stationary and transient solutions. Large variaty of turbulence models. Transport equations for additional scalars. Multi-component and multi-phase fluids. Coupling with solid heat conduction. Solution depended mesh adaptation. Linear scaling of solver with grid size. Scalable parallel performance.

    8. Preprocessing with CFX-Build

    9. Turbulence Models in CFX-5 Release of the latest turbulence models k-? Model Variants k-? Model and BSL Model (Wilcox, Menter) SST Model (Menter, Blending between k-? and k-?) Reynolds Stress Models Extended near-wall treatments Scalable wall functions for k-? Automatic near-wall treatment for k-? and SST LES model (Smagorinski) Documented validation cases on these models are available Future: Improved LES and transition modelling

    10. Problems of Standard k-? Model Two Problems: Missing transport effects. Too large length scales. Result: Reduced or omitted separation. Very often: Too optimistic machine performance.

    11. Standard k-? Model (Wilcox)

    12. Standard k-? Model (Wilcox) Advantages: Lower length scales near wall. Robust sublayer formulation (low-Re). Problem: Free stream sensitivity. Has not replaced k-? models.

    13. k-? Model Free Stream Problem

    14. k-? vs. k-? Formulation

    15. Optimal Two Equation Model Combination of k-w and k-e model: k-w model near the surface k-e model for free shear flows (e equation is transformed to w) Blending is performed automatically based on solution and distance from the surface. This model is called “Baseline Model – BSL” Combined with “Shear-Stress-Transport” limiter offers optimal boundary layer simulation capabilities. BSL+Limiter gives SST model.

    16. Diffuser Flow, 1

    17. Diffuser Flow, 2

    18. Wall Boundary Treatment

    19. Scaling of Variables near Wall

    20. Flat Plate: Velocity Profile

    21. Flate Plate: Wall Friction

    22. Low-Re k-? Model

    23. k-? Automatic Switch

    24. k-? Automatic Switch

    25. Pipe Expansion with Heat Transfer

    26. Pipe Expansion with Heat Transfer

    27. Pipe Expansion with Heat Transfer

    28. Pipe Expansion with Heat Transfer

    29. Summary CFX: Advanced CFD software Fast and robust solver technology Powerful Pre- and Postprocessing tools Leading Turbulence Modells Robust near wall treatment Allows for Accurate solutions Reliable Predictions

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