What's new in FLOW-3D 2023R1
What's new in FLOW-3D 2023R1

What's New in FLOW-3D 2023R1

All products in the FLOW-3D software family received IT-related improvements in 2023R1. FLOW-3D 2023R1 now supports Windows 11 and RHEL 8. Our Linux installer has been improved to report missing dependencies and it no longer requires root-level permissions, which makes installation easier and more secure. And for those of you who have automated your workflows, we added a command-line interface to our input file converter so that you can ensure your workflow is working with updated input files, even in scripted environments.

Expanded PQ2 analysis

Hydraulic systems used in manufacturing can be modeled using PQ2 curves. It is often a convenient simplification to approximate the hydraulic system using a mass-momentum source or a velocity boundary condition to skip the details of the device and include its impact on the flow. We expanded our existing PQ2 analysis model to allow for this type of geometric simplification while still giving realistic results. This translates to a reduction in simulation time and model complexity.

What's New in FLOW-3D 2022R2

With the release of the FLOW-3D 2022R2 product family, Flow Science has unified the workstation and HPC versions of FLOW-3D to deliver a single solver engine capable of taking advantage of any type of hardware architecture, from single node CPU configurations to multi-node parallel high performance computing executions. Additional developments include a new log conformation tensor method for visco-elastic flows, continued solver speed performance improvements, advanced cooling channel and phantom component controls, and improved entrained air functionalities.

Unified solver

We migrated our FLOW-3D products to a single, unified solver to run seamlessly on local workstations or on high performance computing hardware environments.

Many users run their models on laptops or local workstations, but in addition run larger models on high performance computing clusters. With the 2022R2 release, the unified solver allows users to exploit the same benefits of OpenMP/MPI hybrid parallelization from HPC solutions to run on workstations and laptops.

Example of performance scaling
Example of performance scaling using an increasing number of CPU cores
Example of mesh decomposition
Example of mesh decomposition for OpenMP/MPI hybrid parallelization

Solver performance improvements

Multi socket workstations

Multi socket workstations are now very common and capable of running large simulations. With the new unified solver, users using this type of hardware will generally see performance gains from being able to run models taking advantage of OpenMP/MPI hybrid parallelization that used to be only available on HPC cluster configurations.

Low level routines improved vectorization and memory access

Performance gains on the order of 10% to 20% have been observed for most test cases, with some cases yielding run-time benefits in excess of 20%.

Refined volumetric convective stability limit

Time step stability limit is a major driver in model runtime, with 2022R2, a new time step stability limit, 3D convective stability limit, is available in the numerics widget. For models that are running and convection limited (cx, cy, or cz limits) the new option has shown typical speed-ups on the order of 30%.

Pressure solver pre-conditioner

In some cases, for challenging flow configurations, run times can be drawn out due to excessive pressure solver iterations. For those difficult cases, with 2022R2, when a model iterates too heavily, FLOW-3D automatically activates a new pre-conditioner to help with pressure convergence. Tests have improvements in runtime anywhere from 1.9 to 335x faster!

Log conformation tensor method for visco-elastic fluids

A new solver option for visco-elastic fluids is available to our users, and is particularly effective for high Weissenberg numbers.

Improved solution for visco-elastic flow
Example of improved solution at high Weissenberg numbers for visco-elastic flow using the log conformation tensor solution. Courtesy M.F. Tome, et al., J. Non-Newton. Fluid. Mech. 175-176 (2012) 44–54

Active simulation control extensions

Active simulation control functionalities have been extended to include phantom objects, commonly used for continuous casting and additive manufacturing applications, as well as for cooling channels, used in casting and in many other thermal management applications.

Improved entrained air functionalities

For diffusers and similar industrial bubble flow applications, mass sources can now be used to introduce air into the water column. In addition, default values for the turbulent diffusion of entrained air and dissolved oxygen have been updated, and model accuracy for very low air concentrations has been improved.

Example of a diffuser model
Example of a diffuser model: mass sources can now be used to introduce air into the water column

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