Tuesday, February 23, 2010

Tutorial : Intro of GAMBIT - Geometry and Mesh Building Intelligent Toolkit


GAMBIT is produced by Fluent Inc. which is a CAD package software. It is one of Computation Fluid Dynamic (CFD) preprocessors for model's designing and meshing. It uses a graphical user interface (GUI) when taking the input so this makes the design process more easier when bulding, designing and meshing. GAMBIT can accomodate several kinds of modelling software output and also can import several models of ACIS, STEP, Parasolida, IGES etc.

There are two major different techniques for designing the model in GAMBIT :
  • Bottom-up technique : The modelling process in this technique is start by creating the low entity to the high entity. The lower basic of the geometry/volum element is a VERTEX (dot). The join of a couple vertexs can forming an EDGE. EDGE is more higher entity than vertex. And then EDGEs can be joined and forming a FACE. And FACEs can be joined and forming a VOLUM.
  • Up-Bottom Technique : This is the opposite method of bottom-up. First is modelling the highest entity and then followed by modelling the lowest. 
There also the same methods and techniques for meshing. Just pick the most comfortable and suitable for a certain geometry.

Here is the introduction Tutorial guide of GAMBIT :
  • tg00.pdf : describe the GUI and the functions of each toolbar and also the interface function such as mouse or keyboard.
  • tg01.pdf : learn how to Start GAMBIT, Use the Operation toolpad, Create a brick and an elliptical cylinder, Unite two volumes, Manipulate the display of your model, Mesh a volume, Examine the quality of the mesh, Save the session and exit GAMBIT



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Tuesday, February 16, 2010

Tutorial : RELAP5/MOD3 - Reactor Excursion and Leak Analysis Program

RELAP is abbreviation from Reactor Excursion and Leak Analysis Program. This program has been developed by Idaho National Engineering Laboratory (INEL) for best-estimate transient simulation of light water reactor coolant systems during postulated accidents. There are 2 kinds of RELAP from INEL, RELAP5/MOD3 and the newest is RELAP5-3D.RELAP5/MOD3 is a BE (best estimate) system code suitable for the analysis of all transients and postulated accidents in Light Water Reactor (LWR)systems, including both large- and small-break loss-of-coolant accidents (LOCAs) as well as the full range of operational transients.

The one dimensional RELAP5/MOD3 code is based on a non-homogeneous and non-equilibrium model for the two-phase system that is solved by a fast, partially implicit numerical scheme to permit economical calculation of system transients. As a part of the severe accident core meltdown code SCDAP/RELAP5, RELAP5/MOD3 describes the thermal hydraulic aspects of both LWR systems and of the degrading core.

RELAP5/MOD3 can work for these operational system :

  • Cray X-MP (UNICOS),
  • DEC station 5000 (ULTRIX),
  • DEC Alpha Workstation (OSF/1),
  • IBM Workstation 6000 (UNIX),
  • SUN Workstation (UNIX),
  • HP Workstation (UNIX).
  • CDC Cyber (NOS/VE),
  • IBM 3090 (MVS),
  • IBM-PC (DOS)
The picture above is describing the RELAP5/MOD3 execution and process.

DOWNLOAD RELAP5/MOD3 code documentations (PDF file) :

  • Volume I :presents modeling theory and associated numerical schemes; 
  • Volume II :details instructions for code application and input data preparation; 
  • Volume IV : discusses in detail RELAP5 models and corelations; 
  • Volume V : presents guidelines that have evolved over the past several years through the use of the RELAP5 code
  • Input Deck RELAP 5/MOD3 : describes data deck organization and data card requirements for all problem types allaowed in RELAP5/MOD3.2


Download Journals and Research Articles - RELAP5 Applications (PDF file):

Another references from Amazon :


Source/References:


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