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Physics interfaces for Detached Eddy Simulation, a hybrid RANS-LES method, have been added under the Single-Phase Flow section in the Fluid Flow branch. The three new interfaces — DES RBVM, Spalart–Allmaras; DES RBVMWV, Spalart–Allmaras; and DES Smagorinsky, Spalart–Allmaras — are applicable to three-dimensional, time-dependent, single-phase, incompressible flows.
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Predefined High Mach Number, Reacting Flow multiphysics interfaces have been added in the Chemical Species Transport branch. Physics interfaces for laminar flow, and turbulent flow using either the k-ε or the Spalart–Allmaras turbulence models are available for the transport of diluted species. The corresponding physics interfaces for transport of concentrated species are available with a license for the Chemical Reaction Engineering Module.
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The new predefined multiphysics interface, Nonisothermal Flow, Viscoelastic Flow, under the Nonisothermal Flow section in the Fluid Flow branch couples a Viscoelastic Flow interface and a Heat Transfer in Fluids interface.
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The new predefined multiphysics interface, Two-Phase Flow, Level Set, Brinkman Equations, under the Multiphase Flow section in the Fluid Flow branch couples a Brinkman Equations interface and a Level Set in Porous Media interface using the Two-Phase Flow, Level Set multiphysics coupling node. It also adds a Wetted Wall multiphysics feature.
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New multiphysics interfaces, Dispersed Two-Phase Flow with Species Transport, are now available in the Chemical Species Transport branch for laminar flow, and turbulent flow using either the k-ε, k-ω, Low Re k-ε, or SST model. These couple a Mixture Model interface, Continuous Phase Transport of Diluted Species interface, and Dispersed Phase Transport of Diluted Species interface using the Dispersed Two-Phase Flow, Diluted Species multiphysics coupling node.
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The new predefined multiphysics interface, Solid Thin Film Damping, for modeling fluid-induced damping in solid structures, is now available under the Fluid-Structure Interaction section in the Structural Mechanics branch. It couples a Solid Mechanics interface and a Thin-Film Flow interface using the Structure Thin-Film Flow Interaction multiphysics coupling node.
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All transport-equation RANS turbulence models, except for the Spalart–Allmaras model, are now applicable in porous media domains. There are three options for the Porous medium turbulence model: the Nakayama–Kuwahara, Pedras–de Lemos, and a Default option, which combines the other two models.
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For the Large Eddy Simulation and Detached Eddy Simulation interfaces, the Inlet condition has a new option, Include synthetic turbulence, for generating spatiotemporal velocity fluctuations based on a model energy spectrum.
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The new Thin Barrier node in the Multiphase Flow in Porous Media multiphysics interface makes it possible to add thin layers that act as a resistance for the flow fields of all phases without meshing through the layer’s thickness.
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Laminar-to-turbulent boundary layer transition can be modeled by enabling the new Include transition modeling option in the Turbulent Flow, SST interface.
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The Mixture Model multiphysics coupling node in the Phase Transport, Mixture Model multiphysics interface has a new Include bubble-induced turbulence option in the Turbulence section. This option is available for all two-equation turbulence models when the Dispersed phase in the Physical Model section is set to Liquid droplets/bubbles.
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The Two-Phase Flow, Level Set; Two-Phase Flow, Phase Field; and Three-Phase Flow, Phase Field multiphysics couplings have a new option to get the effective material properties from a Multiphase Material node with built-in mixing rules. This is especially effective when coupling these multiphysics interfaces with other physics, such as heat transfer or electrostatics, since the multiphase material will use appropriate mixing rules for nonfluid material properties. In older versions, this would require you to write user-defined expressions based on the volume fraction of each fluid phase to compute the effective material properties used in each physics interface.
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Dedicated material property groups have been added for all available inelastic non-Newtonian models. The material property group contains all necessary material parameters and the apparent viscosity expression. It picks up the shear rate from the fluid flow interface to define the dynamic viscosity in the Basic (def) material model by means of a synchronization rule. Thus, an inelastic non-Newtonian model can be selected directly by adding the corresponding Material Properties group as a subnode to a material node.
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