New Release: Model a Multi-component Two-phase Mixture in Flownex SE 2018
May 30th, 2018
Flownex SE 2018 update 3 has been released, the latest version of this software brings an addition of expanded fluid models, including the capacity to model a ‘liquid-gas’ mixture.
Liquid Gas Mixtures
Flownex® has expanded the fluid models to include a “liquid-gas” fluid model capable of modelling a multi-component two-phase mixture.
The new “liquid-gas” fluid model in Flownex® is ideal for the accurate prediction of the flow regimes and pressure drop of air-oil flow in many industrial applications. For example, in aero-engines, air and lubrication oil are mixed in a bearing chamber, which is subsequently drained by a scavenging system comprising of a pump and piping system where the air and oil are separated.
The complex nature of this two-phase flow, characterized by turbulence, a deformable phase interface, phase interaction, phase slip, and compressibility of the gas phase makes the mixture difficult to analyse and therefore makes these lubrication systems difficult to simulate.
To overcome these difficulties, Flownex® has added an updated set of governing equations to describe the interaction of the phases. Additional pressure drop and flow regime correlations have also been added to provide a commercial solution to the design of pressurised lubrication systems.
The ability has been added for Flownex® to export a network as a FMU (Functional Mockup Unit). This FMU is FMI 2.0 standard compliant and can be used for co-simulations in any FMI 2.0 co-simulation master application. The FMU Configurations is described in more detail in Chapter 14 of the Flownex® General User Manual.
All solving disabled components and links are now clearly indicated with a red cross on the drawing canvas.
Data Transfer Links
An error or warning is now given when data transfer encounters NAN or infinity. There is a setting in the project settings where this can be controlled. There is also an option to pause simulation if error or warning occurs during data.
A list of current global parameters will now pop up when a user starts to type a global parameter in the property grid. To see the list, start typing the “$” symbol in a field in the property grid.
The capability was added to queue for a license. License queueing can be enabled from the Help ribbon, or from a button on the License error dialog.
CFX Generic Interface Coupling
The CFX Generic Interface Coupling component has been updated to reduce solving time. The previous component passed boundary conditions to the CFX solver, started the CFX solver, waited for the CFX solver results and used the results together with expressions in CFD-Post (CFX post processing tool) to return updated boundary conditions. The CFX solver and CFD-Post tools therefore started and stopped each time where information was transferred.
The new coupling allows the Flownex® and ANSYS CFX solvers to run uninterruptedly while updating variables between the environments based on User Fortran routines. CFD-Post is not used to retrieve the updated boundary conditions from the CFX solver results. The CFX solver will not be started and stopped every time information is transferred. This removes the overhead in the CFX processing and cuts the solving time dramatically.
The Flownex basic training course that is available on the Flownex website for registered users was put onto the start page of Flownex. The links on the page link to Youtube videos, so users need to have access to Youtube to view them. In countries without access users can view them by registering on the Flownex website.