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Friday, 27 September 2013 08:00

Flownex base components

Base modules iconFlownex Base Components

Flownex Simulation Environment is shipped with a vast array of components that cover most required simulation scenarios. Shipped Flownex components are used as single components or building blocks of components found in thermal fluid systems or subsystems.

Flownex component models are based on either geometry based fundamental principles or empirical data which allow users to model any type of component in a particular range.

Flownex Base Component Libraries include:

  • Combustion components
  • Containers
  • Custom loss components
  • Differential flow meters
  • Discharge nozzles
  • Flow distributors
  • Heat exchangers
  • Heat transfer components
  • Inlets
  • Mechanical components
  • Nodes and boundary components
  • Piping components
  • Restrictors
  • Turbines
  • Compressors
  • Fans and pumps
  • Valves

 

 

 

Published in Product Information
Thursday, 19 September 2013 06:00

Physics

Physics iconPhysics/Components

Flownex Simulation Environment is shipped with a vast array of components that cover most required simulation scenarios. Shipped Flownex components are used as single components or building blocks of components found in thermal fluid systems or subsystems. Flownex component models are based on either geometry based fundamental principles or empirical data which allow users to model any type of component in a specific range.

 

 

 

Published in Product Information
Friday, 23 November 2012 12:00

Positive Displacement compressor

Question:

If my working fluid is a liquid, can I make use of the positive displacement compressor?

Answer:

Make use of a pump component.

 

Published in Simulation
Friday, 23 November 2012 06:00

Multiple restrictor error

Question:

When using multiple restrictors with loss coefficients the following error appears:

"ERROR, Independent variable Restrictor with Loss Coefficient - 41 -  
     User Description is not of type IPS::Properties::Double. Designer
     aborted, INACTIVE

How do I correct this?

Answer:

A flow-solver error property needs to be changed:

1. In the Flownex library tree, click on the Solver/Utilities tab.

2.  Select ‘Flowsolver’.

3. Uncheck “Treat phase change warnings as errors” in the Inputs tab.

4. Run the designer again to see if it works.

 

Published in Simulation
Friday, 23 November 2012 20:00

Multiple components

Question:

Is there a way to connect multiple elements to a global boundary condition? 

Answer:

No, but what you can do is to make use of a phantom node. You do that by firstly placing one node on the drawing page, next you Right-click on it and select Copy then lastly you Right click anywhere on the drawing page (not on a component) and select Paste View.  This is only valid provided that it is not necessary that the node must be a separate node on its own.

By doing so, the node will be the same node that was copied and all the mass flow will be drawn from it. You can then effectively connect a Pressure boundary to the original node and connect all the fibers to its own “phantom node”

 

Published in Simulation
Wednesday, 11 August 2010 18:06

Nuclear Components

Nuclear iconReactor Components

Pebble Bed Reactor (Generation 2)

The Pebble Bed Reactor element (Generation 2) is a simplified model of the pebble bed nuclear reactor. The purpose of the model is not to do detail reactor design, but rather to allow for the integrated simulation of the reactor together with the rest of the main power system within acceptable computer simulation times.

 

 

Advanced Pebble Bed Reactor (Generation 3)

The Advanced Pebble Bed Reactor model (third generation reactor model) is based on the fundamental equations for the conservation of mass, momentum and energy for the compressible fluid flowing through a fixed bed, as well as the equations for the conservation of energy for the pebbles and core structures. The equations are in a form that is suitable for incorporation in an integrated systems CFD code. This formulation of the equations results in a collection of one-dimensional elements (models) that can be used to construct a comprehensive multi-dimensional model of the reactor (two-dimensional axi-symmetrical model).

The elements account for the pressure drop through the reactor; the convective heat transport by the gas; the convection heat transfer between the gas and the solids; the radiative, contact and convection heat transfer between the pebbles and the heat conduction in the pebbles. Despite the increased complexity, it retains the simplicity of the network approach.

 

 

 

The phenomena that cannot be simulated in the previous pebble bed reactor model (second generation) include the following:

  • The presence of a central reflector column that implies that the core itself does not extend outward from the center but has an inner and outer diameter.
  • The addition and extraction of gas via purpose provided channels and/or leak flow paths along the inner or outer perimeters of the core.
  • The simulation of heat transfer and fluid flow through porous and solid core structures surrounding the core.
  • The simulation of fluid flow and heat transfer, including radiation and natural convection, in purpose, provided cavities between core structures with a two-dimensional rather than one-dimensional nature.
  • The ability to specify normalized radial power distribution profiles within the different axial layers in the core.
  • The ability to take into account heat generation that may occur in any of the core structures.
Published in Product Information