Transcript Verification and Validation.pptx

Verification and Validation
Diagram of a Control Rod Guide Tube on top of a hot
box dome that has been gradually heating up.
A hole was drilled here to increase fluid flow and
increase cooling.
It worked as expected for one reactor and partially
worked in another.
Simple model
To investigate the CFD a simple model of this was made in GAMBIT
Model as two concentric
cylindrical tubes connected
by 4 small holes.
Two inlets at the bottom
with different inlet speeds
and one outlet at the top
through the inner tube.
My first simple mesh was
tested in fluent to learn about
using GAMBIT and fluent.
Unsurprisingly the velocity
was largest through the holes
And the pressure was high in the
outer tube and lower in the inner
tube.
Areas to investigate reliability
User Errors
•Test slight changes in dimensions
•Move back inlet condition
Geometry Generation
•Change the meshing around important areas
Grid Generation
• Test refinement of grid
Model Selection and Application
• Run different turbulence models
Application Uncertainties
• Investigate the influence of assumptions on
target variables
Numerical Errors
•Vary space and time discretisation and
iteration number