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ANSYS Innovations in Fluid DynamicsRelease 18.0 Update
John Stokes, M.A.Sc.Director of Software Development
Fluids Aerospace Technology
• ANSYS Fluent: general purpose• ANSYS CFX: turbomachinery Separate Presentation
Flagship Products
• ANSYS Polyflow: materials processing• ANSYS Forte: internal combustion engines• ANSYS Chemkin-Pro: chemical reaction and fuels• ANSYS FENSAP-ICE: aircraft icing
Specialty Products
• ANSYS AIM Pro: CAD, CFD, FEA, EM, Multiphysics
Design Engineers
Product Update
ANSYS CFD Enterprise• Solvers: Fluent, CFX, AIM, Polyflow, FENSAP-ICE, Forte, 4 HPC• PrepPost: Workbench, AIM, SCDM, ACS, Meshing, ICEM-CFD,
TurboGrid, CFD-Post, Viewmerical, OptiGrid, DX, Simplorer Entry
ANSYS CFD Premium• Solvers: Fluent, CFX, 4 HPC• PrepPost: Workbench, SCDM, Meshing, ICEM-CFD, TurboGrid,
CFD-Post, OptiGrid
ANSYS AIM Pro• Solvers: Fluids, Mechanical, 2 HPC• PrepPost: Workbench, SCDM, Meshing
Updated Product Licenses
Updated Product Licenses
• Updated licenses will be announced by letter– Will describe full update process and additional options– Fluent and CFX licensees will receive ANSYS CFD Premium– ANSYS CFD licensees will receive ANSYS CFD Enterprise
• When will you receive the updated licenses?– Automatically at lease/TECS renewal– Sooner by calling your account manager
• Contact your ANSYS Account Manager for information
Flow with Interacting Bodies and Arbitrary Motion
• Many geometries cannot be well represented using a single, contiguous mesh
• Different mesh types required to represent different geometric features
• Preparing appropriate meshes can be time consuming and complicated
• Large, poorly structured meshes can take excessive time to solve and can result in reduced accuracy
Overset mesh can speed and simplify simulations with multiple moving parts. This example includes multiple background and component meshes.
Problem
Flow with Interacting Bodies and Arbitrary Motion
• Extended overset mesh capabilities in ANSYS Fluent to simplify and speed simulations that include– Structured mesh around individual parts– Part swapping– Moving cell zones without having to use
re-meshing or smoothing– Design exploration studies
• Selected ANSYS 18 enhancements– Use with density-based solver and
compressible flows– Increased parallelization to speed
solutions
Hypersonic compressible flow simulation using overset mesh and Fluent’s density-based solver
Solution
Complex Applications with many Zones, Species, etc.
• Difficult management and workflow
• Numerous Usability Improvements– Wildcard filtering of lists and drop-downs– Grouping in list boxes and tree– Copy/Paste selection– Multi-select in tree – Context-sensitive actions– Optimization of zone conversion algorithm– Automatically mesh interface pairing
Problem
Solution
Post-Processing Functionality and Ease-of-Use
• Need for more efficient and powerful flow visualization
• Richer and easier-to-use post-processing– New Persistent Graphics Object types
• Meshes, pathlines, particle tracks, plots– Compound graphics displays
• Transparency controls, colour maps– Pathlines on all Eulerian phases– Smooth contours– Interactive legend sizing and placement– Simplified solution animation workflow
Problem
Solution
Pushing Performance Further
• Ever larger simulations!
PR Nov. 15, 2017: ANSYS, the High Performance Computing Center (HLRS) of the University of
Stuttgart, and Cray Inc. set a new supercomputing world record (172k cores)
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R18.0
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Nose-based gradients optimized to speed external aerodynamics
• New scalability record 172K cores• >10X faster HDF write performance
– 20X faster than non-HDF• Specific algorithmic optimizations
– Sliding interfaces– Node-based gradients
Problem
Solution
Extended and Improved Adjoint Design Optimization
• Broader need for powerful adjoint optimization
• Added support for – Rotating machinery– Conjugate Heat Transfer (CHT)
• Improved solution stability– Suppression option for dissipation
stabilization scheme
Baseline Fan Blade Modified Fan Blade
8-bladed fan, 1900rpm; Objective: Increase mass flow
Optimized heat exchanger fins show 2.1% improvement in heat flux
Problem
Solution
Reacting Flow Modeling
• Need higher accuracy, greater efficiency and better usability
• PDF combustion with real gas– 20% speed-up
• CHEMKIN-CFD for– Surface reactions– ISAT tabulation
• Visualization of FGM PDF tables– Plot 3D surface or 2D curves of 4-
dimensional (adiabatic) and 5-dimensional (non-adiabatic) PDF tables
T
Temperature, compared with experimental data
Problem
Solution
Multiphase Flow Modeling
• Need higher accuracy, greater efficiency and better usability
• New model for water-oil displacement in reservoirs
• Dramatic speedup for transient VOF problems– 25%-50% solver speed-up, increased scalability
• Compressible multiphase robustness and accuracy– Reduced need for solution steering– Key application: high pressure fuel injectors
• Discrete phase/particulate model enhancements– Injection types, erosion models, condensation,
evaporation, …
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Multiphase VOF
Original
ImprovedRun on CRAY XE6
Problem
Solution
Radiation Modeling for Automotive Headlights
• Prohibitive computational expense of Discrete Ordinates (DO) for collimated radiation
• Monte Carlo radiation model– Support for parallel– Support for periodic zones – Support for multiband (non-gray) radiation– Option to disable radiation in solid zones– Post-processing of surface/volume
standard deviation
Problem
Solution
Forming of Materials with Complex Properties
• Common use of material reinforcement– Steel wires, textile fibers, etc.
• Final orientation of reinforcements required for correct evaluation of mechanical strength
• Anisotropic model to track the re-orientation during forming process
Initial orientation or reinforcements Final orientation of reinforcements
Problem
Solution
Internal Combustion Engines
• Need better time and memory scaling of automatic and adaptive meshing, and reduced mesh sensitivity
• Significant meshing performance enhancements– Reduction in RAM– Better scaling with # Processors Faster turnaround time for engine simulations
• Flame front consistency for different mesh resolutions
Problem
Solution
In-Flight Icing Simulation and Systems Design
• Need for tighter integration of FENSAP-ICE for use with established flow solutions from Fluent and CFX
• Need to continue to expand icing physics modeling
• FENSAP-ICE part of ANSYS 18.0– Incorporated in new product licenses– Available as plug-in to ANSYS Workbench
• Numerous modeling advances– Advanced automation for ice growth– Ice crystal re-injection for engine ingestion– Electro-thermal heating for anti-icing
Problem
Solution
ANSYS AIM Pro
ANSYS AIM Pro – Fluids
• Desire to use AIM’s fast, intuitive workflow for larger range of applications
• Many powerful features incorporated– Heat and momentum sources– Solution-dependent expressions– Calculated value monitoring– Periodic interfaces and automation– Non-Newtonian viscosity– Wall roughness
• Connection to ANSYS Fluent for more advanced fluid physics
Problem
Solution
ANSYS AIM Pro – Extrusion
• Make common extrusion modeling more accessible
• Polyflow solver under AIM Pro– Easy extrusion simulation set up– Setup performed directly on
geometry– Clever defaults, user guidance– Numerics handled automatically– Automated solution process– Easy stop and restart
Problem
Solution
ANSYS Apps
• CFD simulations can require training and best practices that go beyond the standard software solution
• Apps provide faster, better simulations– Automate workflows and problem set-up– Capture engineering simulation best
practices and company specific workflows– Application-specific solutions
• Benefit from the ANSYS ecosystem– Written by ANSYS, channel partners,
customers, consultants, universities
Problem
Solution
Example: Virtual Wind Tunnel
• Automatically set-up and assess external aerodynamics
Example: Enhanced Polyhedral Meshing
• Tie advanced polyhedral capability of Fluent Meshing to parametric and familiar environment of Workbench Meshing
Parameters are set up in Workbench Meshing. ACT drives Fluent Meshing and sends mesh directly to the Fluent solver
Polyhedral mesh in Fluent
ACT
Example: CHT with Forté and Mechanical
• Automatically handle engine-cylinder liner wall, while piston moves past it during engine cycle, to provide appropriate time-average data for CHT analysis
3D IC SimulationForte
3D CHT SimulationThermal Solver
Cycle averaged heat flux
Boundary temperature
ANSYS Fluids at R18.0
• Many new and innovative capabilities• New product licensing for users• Significant enhancements to usability• Powerful new customization tools
Explore Pervasive Fluids Simulation with ANSYS 18.0 today!
感谢聆听
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