www.cd-adapco.com STAR-CCM+ Version 4.06 New Features October 2009
Introduction • Product development is driven by – Anticipation of simulation needs in targeted industry segments – Customer-centric approach • Developing on all strategic fronts
Anticipating Market Needs & Customer Responsive Closed and Resolved Issues in STAR-CCM+ 4.06 • 170+ Development Tasks • 70+ Customers Enhancement Requests
Geometry & Meshing • Surface Preparation (Manual repair) – Repair Feature mode » Automatic identification of glitches, browsing capability » Automatic fixing (either add missing edges or delete bad ones) » Undo/redo since in manual repair mode – Multi-Region Imprint mode for automatic interfacing » Browse of close regions to accept/reject pairs » Imprint one pair at a time or imprint all at once » Each imprint not only connects the two regions, but automatically creates interfaces for user! » Undo/redo since in manual repair mode • Increase User Productivity Who? Why ? • ALL • Shorten the geometry preparation time on large number of parts
Geometry & Meshing • Prism layer mesher – Introduction of new parameter: “layer reduction percentage” » Allows for gradual (automatic) reduction in layers in tight cavities STAR-CCM+ 4.06 Layer reduction at 100% (no retraction) Mesh retracted region in previous versions STAR-CCM+ 4.06 Layer reduction at 50% (50% retraction) • Prism layer quality improvement Who? Why ? • Mainly • Add more user control External • Reduce cells count aero • Improve solution accuracy
Geometry & Meshing • Generalized Cylinder Mesher – Create an extruded mesh on portions of regions when possible – Detect “cylindrical” boundaries (user can accept/reject boundaries) – Mesh controls: layer #, extrusion type, stretching ratio Where ? • Reduce cells count • Pipe flow Who? Why ? • ALL • Create meshes aligned with flow • Cyclones direction • Intake port flows
Physics Broadband Aeroacoustics • – Lilley source term for steady analysis » Reconstruct shear based sources from steady RANS result Reconstructed fluctuations available as output to acoustic codes - » Locates maximum sources quickly – Different models for broadband steady-state synthesis Linearized Euler - Proudman - Goldstein – Specifically designed to model jet noise - Curle – Predicts noise from boundary layer sources - » Less computational overhead than Lilley but more specific • Vehicle design • Aeroacoustics is the study of noise generation • Automotive − Wing mirrors through turbulent fluid motion or aerodynamic − Sunroofs forces interacting with surfaces OEMs Where ? Who? Why ? • Increasingly a concern for manufacturers • Aircraft design • Aircraft • STAR-CCM+ now allows identification and analysis − Landing gear manufacturers − Flaps of possible noise sources • Tier 1 suppliers • For far-field analysis, 3 rd party codes (SYSnoise, • HVAC • Occupant Actran) can read CCM file • Reinforce the multi-disciplinary positioning Comfort
Physics • Real Gas Modeling – Helps predict the true behavior of gas including molecular effects » Where gas is near condensation or critical point » At extremely high pressures and low temperatures – New model IAPWS-IF97 » Industry standard model for water and steam » Formulated in 1997 by the international association for the properties of water and steam in response to demand from steam power industry – User defined equation of state available for both liquids and gasses • Compressibility for liquids • Aero and • Hypersonics • Complete range of density options Where ? (including space craft astrospace Who? Why ? including user specified now available • Power generation re-entry) • Complete flexibility with flow regimes • Gas turbines, high • Gas turbines from low speed through to hypersonic manufacturers pressure combustors covered for both liquids and gasses • Oil and Gas • Steam turbines
Physics • Porous media and heat exchanger models – Anisotropic porous energy » Tensor profile input for Thermal conductivity & Specific heat » Heat transfer in fin & tube heat exchangers display anisotropy » High thermal conductivity (k), low specific heat (Cp) along length of fins the reverse normal to the fins (due to gaps) – Heat exchanger first iteration » Specify at what iteration heat exchanger source is activated » Adds additional control to aid stability • Vehicle thermal • Originally from • Allows extremely accurate management Where ? automotive sector Why ? prediction of heat transfer in fin & Who? tube heat exchangers • Occupant comfort • Aerospace • Improves stability especially for high • Building heating • Electronics cooling temperature heat exchangers and ventilation
Physics • Large Eddy Simulation – Bounded Central Differencing » Addition solver option for LES calculations » LES requires central differencing to ensure accuracy but CD is highly sensitive to mesh quality resulting in occasional instability » Bounded CD “blends” lower order schemes to aid stability Blending consists of first and second order upwind (default for other solvers) - with CD CD is still favored in the blending but where skewed cells are encountered - SOU ensures robust solution while minimizing accuracy compromise • LES on complex • Requested by nuclear • Broadens applicability of LES geometries Where ? industry Who? Why ? calculations • Vortex shedding • Applicable to a wide • Greatly improved stability on off vehicles range of industries “industrial” meshes including automotive • Aeroacoustics and aerospace
Physics Thermal Nox model • – New model improves on previous version – Now it is not fuel dependent and does not require a pure fuel stream Nox prediction is important with Who? Why? strict emission standards Turbomachinery New model is more flexible than Oil & Gas previous version Coal Combustion • − Model combustion of reacting coal particles and gasification − Includes vaporization, devolatilization, char oxidation Who? Why? The STAR-CCM+ model is a more Power-generation advanced model than STAR-CD 4.10 with greater accuracy and flexibility
Physics • Lagrangian Multiphase – Injector values upgraded to profiles » Increased flexibility in injection specification » Use of field functions and tables for specifying injection values – Cone injection type » Specify inner and outer cone angle with particles injected at random within specified cone – Surface injector » Particles injected on part faces as specified by a mass flux • Automotive (vehicle & • Continuing to enhance the • Vehicle soiling Where ? powertrain) Lagrangian multiphase Who? • Parts subject to Why ? • Oil and Gas capabilities and to migrate erosion STAR-CD features • CPI & consumer • Chemical sprays • Add flexibility when specifying products • Combustion droplet injection • Biomedical
Physics • Eulerian Multiphase – Turbulent Eulerian multiphase flow » K- ε turbulence modeling now applicable for multiphase cases where turbulence is applied to all phases » Greatly widens applicability specifically in bubbly flow turbulent mixing • Granular & immiscible • The EMP used extensively when fluid mixing • Chemical VOF or Lagrangian not suitable − Static Processing • Drag forces and virtual lift may Where ? Who? Why ? • Oil & Gas be included − Stirred • Addition of turbulence increases • Nuclear reactor design • Nuclear applicability and is part of the • Separation • Consumer products on-going work to shift • Settling tanks • Manufacturing multiphase capabilities from • Bubble columns STAR-CD
Physics • Harmonic Balance – Blade flutter capability added » Rapid self-feeding motion, potentially destructive, excited by aerodynamic forces » Prescribed flutter deforms mesh to simulate blade motion Blade motion modes calculated from structural analysis - Mesh morpher called at each time level - » Motion may be differently phased across blade rows • Blade flutter can cause serious damage in • Turbomachinery turbines so mitigation prior to design is important − Gas turbines − Aero engines • Transient phenomena in rotating machinery but • Gas Turbines Where ? − Steam turbines Who? Why ? often neglected due to timescales involved • Turbomachines • HVAC • Fans • HB More economical than full unsteady − Radial and axial • Blades simulation, 2 orders of magnitude saving in fans • Wind Turbines computational costs for viscous flows • Powergeneration • More accurate than conventional steady state − Wind turbines methods (e.g. frozen rotor) − Pelton turbines
Physics • Finite Volume Stress – Large displacements » Account for large displacements when parts are deformed New methodology for grid movement - – Implicit FSI » Increased stability and accuracy » Small displacement only • Large displacement is necessary when the • Oil and Gas • Riser VIV deformation of the solid part becomes too • Pipe simulation Where ? important for being modeled with small • Nuclear Who? Why ? displacement model • Cooling applications • Implicit treatment for FSI is required for • Automotive increasing stability and accuracy of the • Nuclear reactors powertrain solution • Turbomachiery • Flow, Thermal Stress in one code !
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