What's New

View new features for AcuSolve 2022.1.

Altair AcuSolve 2022.1 Release Notes

Highlights

  • Gas Kinetics Model

New Features

Gas Kinetics Model
The mixture of component gases is the latest enhancement in AcuSolve’s long list of multiphase simulation capabilities. The Gas Kinetics model accounts for molecular configuration and weight, intermolecular energies, collision, and other parameters to predict the proper advection, diffusion, and blending of the various gasses. Both binary and self-diffusion are supported.

Enhancements

Eulerian-Eulerian Surface Tension
Fluid behavior on hydrophilic or hydrophobic surfaces can now be simulated more precisely in the Eulerian-Eulerian multiphase model with the addition of surface tension support in conjunction with contact angle model definition.
Porous Medium Effectiveness Type
The effectiveness of the resistance within a porous region may now be controlled by the local temperature of the flow within that porous region. In addition to constant values for effectiveness, piecewise_linear, cubic_spline, and user_function definitions of temperature variation may be defined.
AcuTherm Updates
AcuTherm output has been improved to support the surface point cloud output format for TAITherm via the -to csv option. The default value for thermal_layer_edge_y_plus is now 100 and AcuTherm now outputs data for laminar and solid-only simulations when film_coefficient_type is set to direct or user_ref_temp.
Topology Optimization Automatic Darcy Coefficient
The Darcy coefficient, which is utilized by the topology optimizer to identify the fluid region within the design space, can now be set to automatically adjust and update based on the simulation state. This workflow improvement removes the burden of setting this important parameter, provides faster convergence of the optimizer, and improves the final topological shape.
New HyperWorks CFD-based Tutorials
One (1) new tutorial is available in the HyperWorks CFD user interface. The new tutorial is:
  • ACU-T: 3600: Melting of Diesel Exhaust Additive within an Enclosed Tank
New SimLab-based Tutorials
Five (5) new SimLab-based tutorials are available on the SimLab Learning Center (web.altair.com/altair-for-simlab-learning-center-trls). The new tutorials are:
  • ACU-T:3401/SL 2411 Electric Motor Analysis using AcuSolve-Flux One-Way Coupling
  • ACU-T:4400/SL 2270 Y-Junction Mixing Flow using the Gas Kinetics Model
  • ACU-T:3600/SL 2175 Melting of Diesel Exhaust Additive within an Enclosed Tank
  • ACU-T:4300/SL 2240 Species Transport Modeling
  • ACU-T:4400/SL 2270 Y-Junction Mixing Flow using the Gas Kinetics Model
  • ACU-T:5002/SL 2302 Blower - Hybrid Motion (Rotating Frame + Sliding Mesh)
New SimLab-based Validation Cases
Five (5) new validation cases are available in the SimLab user interface. The new validation cases are:
  • Flow Inside a Rotating Cavity
  • Turbulent Flow Through a Wavy Channel
  • Laminar Flow Through a Pipe with Imposed Heat Flux
  • Laminar Poiseuille Flow Through a Pipe
  • Laminar Flow Through a Pipe with Constant Wall Temperature
Accessing Tutorial Model Files
For HyperMesh and HyperWorks CFD-based tutorials, you can now click a link, within a tutorial, to download the required model file(s) for that tutorial.
Important: This download option is only available if you (or any user) are connected to the internet. Users attempting to download a model file will be prompted with further directions on how to access the model file online. A zipped package of the model files can be downloaded from the Altair One Marketplace and extracted to a local machine or directory on your company’s local server.

Resolved Issues

  • An error which caused AcuSolve-EDEM unidirectional coupling to crash in v2022 has been fixed.
  • In AcuSflux, the solar direction definition has been corrected.
  • When AcuSolve is installed on a network drive, user functions can now be compiled on Windows platforms with AcuMakeDLL.
  • An issue where zero mass flux was reported with porous media physical velocity has been corrected.
  • Nodal output for extremely long running transients could shift the time step of output due to a precision error. This has been resolved.
  • A correction was made regarding mesh motion and multiphase flow with large density differences between fluids.
  • A description of element output statistics has been added to the Programs Reference Manual.
  • In the Command Reference Manual, the default values under REFERENCE_FRAME for centrifugal, Coriolis, and angular_acceleration are all now correctly shown to be on.
  • In HyperWorks CFD tutorials 2D plotting in AcuProbe has been replaced with the new plotting tool in the integrated post-processing workflow.
  • A minor setup change to ACU-T: 5201 has been made to define externally coupled surfaces as unconstrained.
  • A link to AcuSolve tutorials from the main help page under CFDSolversHelp has been corrected.

Altair AcuSolve 2022 Release Notes

Highlights

  • Euler-Euler Multiphase
  • Granular Multiphase
  • Electric Potential Solver

New Features

Euler-Euler Multiphase
AcuSolve’s multiphase capabilities expand yet again in version 2022 with the introduction of Eulerian-Eulerian multiphase. With this feature you can include the exchange of momentum between multiphase fields. As with the Algebraic Eulerian mixture multiphase model the dispersed fields can be of any material type, liquid, solid, or gas. In addition, inflow conditions of each phase may be defined separately via any of the following phasic inflow types: cartesian, cylindrical, or spherical velocity, normal velocity, mass flux, or volumetric flow rate.
Granular Flow Multiphase
With the addition of Eulerian-Eulerian multiphase you also have the option to include solid pressure and solid viscosity effects when modeling dispersed solid phases. When simulating granular flows, the granular temperature, a representation of the random oscillations of particles, the particle restitution, which defines the fraction of a particle’s momentum after collision, and the angle of internal friction, a measure of the ability of a unit of rock or soil to withstand a shear stress, may all be specified by you.
Electric Potential Solver
Solve for the thermal effects of a voltage drop or prescribed current or current density by activating Joule heating under the electric potential solver in AcuSolve 2022. This electrostatic solution to charge conservation allows you to vary the available electric boundary conditions through multiplier function control so that accurate duty cycles can be simulated.
AcuSolve Help delivered in separate package
A new package, hwCFDSolversHelp, including reference manual, training manual, and validation manual documentation is now available for download and install from Altair One. This package can be installed whether hwCFDSolvers is installed or not. Model files for tutorials and validations are available online from a link in the Help documentation as well as from Altair One.

Enhancements

AcuSolve/EDEM Drag and Lift model user-defined functions
Custom definitions of drag and lift models for use with AcuSolve/EDEM coupling simulations can now be specified via the user_function value for drag_model and lift_model under the FIELD_INTERACTION_MODEL definition. You are encouraged to test their functions for range and validity prior to simulation as no bound or specific error checking is performed in AcuSolve/EDEM coupled simulations. See the AcuSolve User-Defined Functions Manual for information about creating and referencing user-defined functions.
Improvements to Topology Optimization
Improvements have been made to AcuSolve’s integrated topology optimization that increase the speed of convergence and improve the overall robustness. Porous zones are now supported, lower viscosity fluids are now handled more precisely, and you are notified when unsupported physics are selected, or no design space volume is found.
Ogden ALE Mesh Motion
You can now easily switch between different Arbitrary Lagrangian-Eulerian (ALE) mesh motion techniques directly in the input deck. A new ALE mesh equation option, previously available through the aletech cnf parameter, named ale_ogden, activates Ogden mesh motion. Mesh motion based on mesh quality metrics is activated by using the previously available ale mesh equation.
New HyperWorks CFD-based Tutorials
Two (2) new tutorials are available in the HyperWorks CFD user interface. The new tutorials are:
  • ACU-T: 4101: Eulerian-Eulerian Multiphase
  • ACU-T: 4102: Granular Flow
New SimLab-based Tutorials
Sixteen (16) new tutorials are available in the SimLab user interface. The new tutorials are:
  • ACU-T: 2300 / SL 2060: Atmospheric Boundary Layer Problem – Flow Over Building
  • ACU-T: 2400 / SL 2030: Supersonic Flow in a Converging-Diverging Nozzle
  • ACU-T: 3310 / SL 2160: Single Phase Nucleate Boiling
  • ACU-T: 3311 / SL 2161: Multiphase Nucleate Boiling using the Algebraic Eulerian Model
  • ACU-T: 3500 / SL 2170: Electric Potential
  • ACU-T: 4002 / SL 2220: Sloshing of Water in a Tank
  • ACU-T: 4003 / SL 2260: Freely Falling Water Droplet
  • ACU-T: 4101 / SL 2231: T-junction Flow using the Eulerian Multiphase Model
  • ACU-T: 4102 / SL 2232: Fluidized Bed using Granular Multiphase Model
  • ACU-T: 5403 / SL 2421: Piezoelectric Flow Energy Harvester: A Fluid-Structure Interaction
  • ACU-T: 6100 / SL 2430: Particle Separation in a Windshifter using Altair EDEM
  • ACU-T: 6101 / SL 2431: Particle Separation in a Windshifter using AcuSolve – EDEM Unidirectional Coupling
  • ACU-T: 6102 / SL 2432: Particle Separation in a Windshifter using AcuSolve – EDEM Bidirectional Coupling
  • ACU-T: 6103 / SL 2433: AcuSolve – EDEM Bidirectional Coupling with Heat Transfer
  • ACU-T: 6104 / SL 2440: AcuSolve – EDEM Bidirectional Coupling with Non-Spherical Particles
  • ACU-T: 7200 / SL 2500: Topology Optimization
New SimLab-based Validation Cases
Four (4) new validation cases are available in the SimLab user interface. The new validation cases are:
  • Turbulent Flow Through a Pipe
  • Laminar Flow Through a Channel with Heated Walls
  • Laminar Couette Flow with Imposed Pressure Gradient
  • Laminar Flow Past a 90° T-Junction
MicroSoft Visual Studio 2019 Support
Support for MicroSoft Visual Studio 2019, Community, Professional, and Enterprise versions, has been added. The compiler version and location in use are also reported to you.
Reference Frame on Interface Surfaces [Beta]
A beta release of hybrid use of reference frame and sliding mesh is available by activating the hybridmrf configuration parameter. This feature allows you to take larger time steps when simulating sliding meshes.

Resolved Issues

  • AcuConsole and AcuFieldView have been officially retired and are no longer shipped with AcuSolve (hwCFDSolvers).
  • References to AcuConsole and AcuFieldView have been removed from documentation.
  • The -tlog, -lprobe, -acutail, and -acuprobe options have been removed from the AcuRun command.
  • The default lift model for the Eulerian-Eulerian and Algebraic Eulerian multiphase types has been set to none.
  • An issue with interior thermal shells allowing thermal conduction at shell ends has been fixed.
  • EDEM particle volume fractions are now correctly handled during mesh contraction and expansion.
  • AcuSolve GPU acceleration has been updated to CUDA 10.2.
  • An error with PQ curve input to the FAN_COMPONENT has been corrected.
  • An issue when specifying pressure inlets with the humid air model has been fixed.
  • An error with initializing the eddy viscosity field when initialize_Stokes = on has been fixed.
  • An issue with specifying nodal initial conditions by element set has been corrected.
  • Changes were made that improve the steady state solution using the ideal gas density model.
  • In the Command Reference Manual, non-spherical lift and torque model information was added under FIELD_INTERACTION_MODEL.
  • In the Programs Reference Manual, information about setting the number of threads for AcuPrep under the AcuRun command has been added.
  • HyperMesh-based tutorials have been updated to reference HyperGraph for 2D plotting.