FLOWNEX SE 2017 | UPDATE 2

Flownex SE's update 2 includes major enhancements to even further improve user-friendliness and ease of use, enhanced solving capability and speed, additional features and solvers, as well as new models and components.

 

In this update, attention is given to the Licensing Module Selector, as well as a new CFX generic interface component that enables the user to model heat transfer and pressure drop in 3D (ANSYS CFX), seamlessly coupled to a 1D network (Flownex® ).

We continue to lead the way in the systems simulation tool market with a steady hand on quality, reliability and accuracy, timeous dependable support, and frequent user-applicable development.

Luke Davidson | Internation Marketing & Channel Manager

Recent Major Enhancements

Here's a list of added enhancements we've added to the Flownex 8.8.2 2017 release:

Licensing Module Selector

CFX Link

Cavity Wall Editor

Global Parameters

API/Extendibility

Excess Flow Valve

Licensing Module Selector

The licensing module selector enables the user to choose which modules should be selected when using Flownex®. To select modules, the License Setup dialog should be opened that is available under Help. In the License Setup dialog, a Module Selection tab has been added. An option is available to use all available module licenses, which is the default option.

 

 Figure 1

 

If the “Use all available module licenses” option is unselected, a list of modules is shown to choose from. All modules are always listed and not only the modules with licenses available.

 

Figure 2

When modules are selected in the License Setup window, Flownex® will check if there are licenses available and if this module is selected. It is important to ensure that licenses are not borrowed when module selections are made – as borrowed licenses that are unselected will not be automatically returned.

CFX Link

A component that links Flownex® to CFX has been added. 

 

Figure 3

 

The CFX Generic Interface component gives the user the ability to model heat transfer and pressure drop in 3D (Ansys CFX) seamlessly coupled to a 1D (Flownex®) network. In a Flownex® time step, boundary conditions are passed from Flownex® to the CFX setup, the CFX setup is solved, and results are extracted and returned to Flownex®. Boundary conditions and returned results include mass flow, speed, pressure, and temperature. The CFX Generic Interface component does not support co-simulation in steady-state although it can be run in transient until the combined solution converges.  Below you can see how the CFX Generic Interface component is linked to a Flow Resistance element in Flownex®

 

Figure 4

 

Cavity Wall Editor

An editor has been added that allows a user to draw the cavity wall profile for Rotor-Rotor or Rotor-Stator components with complex geometry specification turned on.

The Cavity Wall Editor allows users to select a background image and easily draw and modify the wall profile on top of this image.

 

Figure 5

Global Parameters

The capability to specify global parameters have been added. These parameters can be linked to any amount of inputs. Any changes to the parameter value will change all the associated input fields.

Global parameters act like any other property in Flownex® and can be used as part of transient scenarios in actions, sensitivity analysis studies, reporting, etc.

Global parameters can be defined in any input field, or an input field can be linked to a global parameter. To define a global parameter in an input field, type a “$” followed by the parameter name. This will create a new global parameter, the input will be linked to that parameter and the value of the input field will be used for that parameter. To refresh, select the component again and it can be seen that the input field is now disabled. Right-clicking on the field will show a context menu that will take the user to the parameter definition.

To link an input field to an existing global parameter, type a “$” followed by the parameter name. The input will be linked and the value of the input will be set to the existing parameter value. 

To see the global parameters configuration, or manually add, edit or delete parameters or linked properties, go to Global Parameters on the configuration ribbon.

 

Figure 6

 

The Global Parameters dialog will then open :

 

Figure 7

 

To use global parameters in actions, etc. open the Solvers tab and select Global Parameters, as seen below:

 

Figure 8

 

The global parameters will be listed in the Input Property grid, where the user can drag and drop the Value of the global parameter to use like any other input property in Flownex®.

API/Extendibility

  • Several new examples were added to show how to automate Flownex® from different environments.
  • A Python example was added to show how to use Flownex® with ordinary Python (IronPython is then not required).
  • Added a complete Python example to build a complex network.
  • Added an example to shows how to build a network via C#.
  • Added examples that show how to modify properties, solve and get results via C#.

Excess Flow Valve

An Excess Flow Valve (EFV) has been added in Flownex®

Figure 9

 

An EFV is mainly used in gas distribution networks as a protection device. In the event of a pipe rupture downstream of the EFV, the EFV will automatically close, effectively closing the gas flow to the ruptured area. The closure mechanism of an EFV is brought about by an increase in gas flow rate in the pipe line, resulting in increased drag force on the valve components, which closes once a certain specified limit is exceeded. This flow rate is known as the “shut off flow”.

The shut off flow rate (Vs) is the flow rate at which the drag forces on the internal valve elements are such that it overcomes the internal spring force, effectively closing the EFV. Most manufacturers give the shut off flow in terms of a normalized volume flow rate versus inlet pressure at a single point or as a graph over the EFVs pressure range as is typically shown below:

 

Figure 10