Understanding GT-POWER

Title:  Understanding GT Power

Objective. 1. Understand GT –SUITE modules

1. Locate some setting
2. Explore intercooler tutorial
3.   Solve problem on intercoolers

1. GT Suite Module

GT-ISE(Integrated simulation environment)

  GT-ISE is the main interface where models are built, simulation settings are declared, and simulations (both single and batch) are launched.  It is an environment where various components are brought into a project map and connected together linking the entire model as a whole.

• various 2D and 3D visualization tools are available for components, for example a 3-D viewer of the GT-SUITE predictive 3D flow junction, the FlowSplit.
• DOE/batch runs can be easily created by using GT-ISE’s Case Setup with “parameters”, which can be created for nearly any input (i.e. the diameter of a pipe).
• Compound templates (i.e. “super-components”) are available for users to make their own templates from basic components, with their own help files, plots, RLTs, and control signals.

2. GEM3D Pre-Processor

GEM 3D is a 3D graphical processor that combines  building & importing tools used to create

1D GT-Suite model from 3D geometries

• GEM3D can be used to build models from primitive components like pipes, flow-splits, shells, catalysts, pumps, etc.
• GEM3D can also be used to import 3D CAD models from other applications, especially GT-SPACECLAIM.  Once imported it can be used as a “characterizer” to automatically find effective lengths, diameters, bends, volumes, etc. of complex shapes, and convert them into GT-SUITE equivalent parts, such as pipes and flow-splits
• Not only can 3D models be imported and characterized, but additional components can also be added to these models in GEM3D.
• The design is general such that GEM3D can be used for many applications including engine performance, acoustics (intake and exhaust systems), lubrication, cooling systems, hydraulics, crank-trains, and more.

1.  COOL3D

       GT-SUITE is the ideal modeling platform for vehicle cooling analysis.  GT-SUITE models can be used to analyze pressure drop, flow distribution, and thermal performance of liquid circuits that cool heat-generating components.  GT-SUITE is also used to optimize air flow and heat transfer in the underhood cooling module where heat is rejected to ambient.  Construction of GT-SUITE cooling models is enhanced by powerful 3D tools.  The GEM3D tool easily converts CAD geometry of flow networks into 1D GT models.  The separate COOL3D tool allows for 3D model building and automatic export of underhood cooling module models.

4. VTDESIGN (Valvetrain Design tool)

VTDESIGN is a graphical preprocessing tool for valvetrain and cam design.  It has several capabilities.

• Cam design tool for creating/modifying cam profiles, using one of many methods: constrained polynomials, intuitive b-spline control of acceleration, or hybrid spline with low order constants/slopes/quadratics connected by splines.
• Dimension-by-dimension visual setup of the valvetrain mechanism.  All 5 standard valvetrain types are supported, and profile entered can be cam shape or valve lift profile
• Kinematic and Quasi-Dynamic (Elasto-Kinematic) analysis can be run and viewed directly from the VTDESIGN interface (and updated dynamically with any cam profile changes).  CNC cutting tool path can also be calculated from kinematics.
• Spring design tool to create and modify spring shapes, using geometry (axial height vs. helix angle) or force vs. displacement curves.  Spring free stroke, solid height, Eigenmode analysis, and fatigue safety factor are all calculated within the interface.

5.GT-SPACECLAIM

GT-SPACECLAIM is a 3D CAD tool included with GT-SUITE.  Key applications include:

• Extracting the inner/fluid core (negative) of a solid model
• Importing and converting common CAD formats to GEM3D and COOL3D
• Simplifying geometry to prepare a model for simulation
• Building solid geometry for simulation before production CAD files are available

1. Importing Geometry
   • GT-SPACECLAIM uses built-in translation tools to import common CAD formats into GT-SUITE.  Supported formats include Parasolid, Solidworks, NX, STEP, IGES, and many others.  
2. Simplifying Geometry
   • GT-SPACECLAIM has powerful tools for simplifying geometry in preparation for converting to 1-D components.  The flow volume of the imported parts can be easily obtained, and unnecessary features can be removed.
3. Model Building  
   • GT-SPACECLAIM also contains a suite of building tools for creating anything from simple concept models to fully-featured parts.  New geometry can be created quickly and easily using simple tools.  A library of parametric shapes is included, and geometry can also be created from a sketch profile.

6.GT-POST

Once a simulation is complete, results are viewed in GT-POST, a graphical interface that enables viewing and manipulating of the data collected from the simulation.  GT-POST contains the following functions and more:

• Graphically based data post-processing
• Quickly generate 2-D and 3-D plots
• Combine data from different cases, simulations, or tests into a single plot
• Re-usable post-processing templates allow instant cross-plotting of results from different
  simulations
• Implicit links to ASCII/Excel files with database capabilities for fast and flexible access to
  measurement data.
• Import or Export data to/from ASCII or MS/EXCEL files
• Perform various math operations on data in all plots (sum, difference, integral, derivative, FFT…)
• Animation of transient processes
• User-definable tabular output of computed results

1. Locate following setting
2. 1. Time control flag

1. Time step & solution control

3. Integrator/ solver type

3.Explore  intercooler tutorial & note  down setting

1. Run setup

• Time control
• Initialization
• Flow control
• ODE Control
• Signal control
• Thermal control
• Convergence RLT

2.Advanced setup

• General
• Flow
• Mechanics
• Restart
• Version changes
• Paths
• MiscFiles

3.Plot setup

We can set plot point or location where we measure the parameters

4.Output setup

• Data storage
• General
• GT-Post setup
• Flow
• ODE Mech
• Scoreboard RLT
• User scoreboard RLT
• Endof RUN tables

1. Problem on intercooler

    Given

• Diameter of cooler inlet and outlet pipe= 50 mm
• Length of the CAC= 1000 mm
• Inlet mass flow rate = 1200 kg/ h at 100 degC
• Outlet pressure 2 bar at 30 deg C

• Calculate the total heat transfer at Charge air cooler (CAC)
• Calculate pressure drop across CAC

Maximum simulation duration is 1Sec uses as for 0.5 sec it’s not reach at steady state

Total heat transfer At CAC (Charge air cooler) = 7.55KW

Pressure drop across CAC= 1.12e-5

Conclusion

1. 1. Understand GT –SUITE module
2. Locate some setting like time control flag, time step & solution control
3. Explore intercooler tutorial & study of Run setup, advanced setup, pot setup etc.s
4. Solve problem on intercoolers