Week 1 : Exploring the GUI of GT-POWER

Aim - Explore the GUI of GT-SUITE and exploring the intercooler tutorial and solving one problem based on it (calculate the Average heat transfer at CAC and Pressure drop across the CAC).

GT-SUITE is the industry-leading simulation tool with capabilities and libraries aimed at a wide variety of applications and industries.

It offers engineers functionalities ranging from fast concept design to detailed system or sub-system/component analyses, design optimization, and root cause investigation.

Multi-Physics Platform
The foundation of GT-SUITE is a versatile multi-physics platform for constructing models of general systems based on many underlying fundamental libraries:

• Flow library (any fluid, gas or liquid or mixture)
• Acoustics library (both non-linear and linear)
• Thermal library (all types of heat transfer)
• Mechanical library (kinematics, multi-body dynamics, frequency domain)
• Electric and Electromagnetic library (circuits, electromechanical devices)
• Chemistry library (chemical kinetics)
• Controls library (signal processing)
• Built-in 3D CFD and 3D FE (thermal and structural)

• GT-SUITE: It contains all GT libraries and capabilities. The ideal choice for full vehicle design and analysis, GT-SUITE offers an all-inclusive package that provides an important cost advantage to users.
• Engine Performance and Acoustics
• Exhaust After treatment
• Evaporative Emissions
• Cooling Systems and Thermal Management
• Air Conditioning/Waste Heat Recovery
• Fuel injection
• Hydraulics and Pneumatics
• Lubrication Circuits
• Vehicle and HEV Fuel Economy and Performance
• Transmission and Shift Quality
• Crank train and Crankshaft Dynamics
• Valve Train Kinematics and Dynamics
• Timing and Front End Drive Systems
• Battery Modeling Electrical Equivalent

• GT-POWER: The industry-leading software for engine simulation with a detailed cylinder model and combustion analysis.
• Engine Performance and Acoustics
• Exhaust After Treatment
• Evaporative Emissions

• GT-SUITEmp: It Serves as a multi-physics platform to construct models in a wide range of applications including Cooling Systems and Thermal Management, Vehicle and HEV Fuel Economy, Hydraulics and Pneumatics, and many more.
• Exhaust After treatment
• Evaporative Emissions
• Cooling Systems and Thermal Management
• Air Conditioning/Waste Heat Recovery
• Fuel injection
• Hydraulics and Pneumatics
• Lubrication Circuits
• Vehicle and HEV Fuel Economy and Performance
• Transmission and Shift Quality
• Crank train and Crankshaft Dynamics
• Valve Train Kinematics and Dynamics
• Timing and Front End Drive Systems
• Battery Modeling Electrical Equivalent

In addition to the above, GT also bundles various tools and models:

Tools:

• GT-AutoLion:– Integrate AutoLion battery models directly into GT-SUITE’s electrical and thermal domains
• GT-POWER-xRt:– Tool dedicated to running detailed GT-POWER engine models on MiL/SiL/HiL platforms
• GT-SUITE-RT:-Run GT-SUITE models on HiL platforms
• GT-Automation:-A time-saving enterprise package that allows simulation engineers to write Python code to manipulate GT models programmatically
• GT-AutoLion-3D:- A 3D battery modeling capability that allows battery cell designers and buyers to study important factors that determine a battery’s performance, capacity, and longevity.
• GT-TAITherm:- Perform fast 3D cabin comfort analysis with a special version of TAITherm packaged directly inside GT-SUITE
• Advanced Combustion Toolset: A collection of productivity tools for combustion analysis that enable both increased model fidelity and faster runtimes
• GT-RealDrive:- Simulate vehicle models on real-world routes including traffic density, traffic signals, and speed limits
• GT-CONVERGE:- Built-in 3D CFD supporting co-simulation or stand-alone analysis, both transient and steady-state
• GT-SPACECLAIM:- CAD model building and preparation
• GT-Linearization:- Linearization of models for controls development

Some of the Modules that are Used in GT Power are shown below in detailed below:

COOL3D:

• COOL3D is a tool that can be used to build 3D models of underhood thermal management flow systems that can be discretized and made into model files for use with GT-SUITE. It provides the ability to build the model in a 3D environment so that the full details of the model can be included. It also includes sophisticated discretization logic that is able to transform the 3D model into a model file that is compatible with the GT-SUITE software. COOL3D can be used to build any flow system that contains only blockages, fans, heat additions, and heat exchangers

GT-ISE:-

• It is the main interface where models are built and simulation are launched. It is an environment where all the elements are brought up into the map and connected together linking the entire model.It creates the model in sequential order step by step like engine cylinder,engine crankshaft,combustion,Valve train etc.

GEM 3D:-

• GEM3D is a tool that can be used to build 3D models of flow, thermal, and mechanical systems that can be discretized and made into model files for use with GT-SUITE. It provides the ability to build the model in a 3D environment so that the full details of the model can be included. It also includes sophisticated discretization logic that is able to transform the 3D model into a model file that is compatible with the GTSUITE software. GEM3D can be used to build any system that contains components like pipes, mufflers, manifolds, air boxes, heat exchangers, underhood, cabin, batteries, crankshafts, etc.

GT-POST:-

• GT-POST is a powerful data analysis tool used to plot, view, and manipulate data generated either by a GT-SUITE simulation or by an external source. It offers a more efficient data analysis solution than standard spreadsheet software. By employing data pointers, the results viewed in GT-POST are updated automatically and immediately when a model is changed and a simulation is rerun. Also, GT-POST lends itself nicely to the development of portable, user-defined templates that control how results are presented.

VT-DESIGN:-

• VTDESIGN is a stand-alone, interactive cam/valvetrain/spring design tool supplied with GT-SUITE that may be used as a preprocessor to GT-SUITE. VTDESIGN is composed of three main features including the Cam Design feature, the Valvetrain Design feature, and the Spring Design feature. These three features can be accessed at any time by clicking on the separate tabs in the lower left hand corner of the project window titled "CamDesign", "Valvetrain", and "SpringDesign".
• VTDESIGN can be used to create a profile or automatically generate a Multi-Body Dynamic valvetrain model for analysis in GT-SUITE

GT-SPACECLAIM:-

• GT-SPACECLAIM is a tool that can be used to import CAD geometry of various formats, extract volumes and export them for discretization in GEM3D. Building and exporting 3D models of flow systems is also possible. This basic shapes that can be created with GT-SPACECLAIM. These shapes are similar to the ones that can be created in GEM3D, and can be combined to form complex geometry.

- Locate the settings

1.TIME CONTROL FLAG

Open the GUI of GT_suite and open the flow control Tab>Home Tab > RunSetup >Time Control. In the given table the Time Control Flag is Available

In the below image we can see the Time Control Flag option

Defines the global simulation type with regard to time. One of the following options:

• Periodic: Periodic indicates that the model contains at least one circuit which contains a periodic event (i.e. engine cylinder “cycle”) and therefore requires tracking of results with respect to angle over each cycle. Any model that includes an ' EngineCrankTrain', ' CrankAnalysis' , or ' EngineCrankShaft' part should use the periodic option. Note that the simulation duration for a periodic simulation can be specified in cycles or in time, whichever is most convenient.
• Continuous: Continuous indicates that the simulation includes no periodic event, and therefore has no need to track results with respect to a cyclic angle. This is the typical setting for models that contain only quasi-steady fluid circuits such as coolant or underhood air. The simulation duration for a continuous simulation is typically specified in time.
• TIME STEP AND SOLUTION CONTROL:
  • Open the GUI of GT_suite and open the flow control Tab>Home Tab > RunSetup >Flow Control.There we can observe the Time Step and Solution Control
  • In the below image we can see the Time Step and Solution Control option

• Name of the ' FlowControlExplicit', ' FlowControlImplicit', or ' FlowControlQS' reference object that can be used to define the numerical parameters for the explicit, implicit, or quasi-steady flow solver, respectively.
• If there are no flow circuits in the model, starting in V2016 Build 2 this attribute may be set to “ign” or left blank (which is a rare exception to the normal requirement in GT-SUITE that all cells must be filled).
• INTEGRATOR/SOLVER TYPE
  • Open the GUI of GT_suite and open the flow control Tab>Home Tab > RunSetup >ODE Control.There we can observe the Integrator/Solver Type
  • In the below image we can see the Integrator/Solver type option

Integrator/solver type used in the time-marching of all ODEs including mechanical, electrical and magnetic libraries. For recommendations based on the application, please see the color-coded table immediately following this text.

• Explicit-Adams-PECE: Explicit Adams-Bashforth-Moulton predictor-corrector integration scheme with variable order accuracy. This integrator is recommended for large non-stiff problems, problems with a high maximum time step which have different scales and real time applications. It requires a tuning process in order to optimize its functionality, please contact Email: [email protected] for more details.
• Explicit Runge-Kutta: integration scheme that is 5 th order accurate. This integrator is recommended for non-stiff problem
• Implicit-Trapezoidal: Implicit Trapezoidal integration scheme that is 2 nd order accurate. This integrator is recommended for moderately stiff problems.
• Implicit-H.H.T:Implicit Hilber-Hughes-Taylor integration scheme that is 2 nd order accurate. This integrator is recommended for moderately stiff problems.
• Implicit-Radau2: Implicit 2-stage Radau integration scheme that is 3 rd order accurate. This integrator is recommended for stiff problems.
• Implicit-Radau3: Implicit 3-stage Radau integration scheme that is 5 th order accurate. This integrator is recommended for stiff problems.
• Implicit-S.D.C.3: Implicit 3-stage Spectral Deferred Correction (S.D.C.) integration scheme that is 5 th order accurate. This integrator is recommended for very stiff problems.

- Exploring the intercooler tutorial

Open the Gt suite and click on Files and then select Tutorials then select Engine Performance and then 6cylDITurbo and then select the intercooler_final.gtm

Thus the intercooler set up will pop up on the screen.

1. Run setup -

In this module all the settings are done according to the results of our Simulation to obtain the exactly results.It Contains the different Setups like Time Control,Intialization,Flow Control,ODE Control,Signal Control,Thermal Control,Convergence RLT.

Each Settings have a different Attributes to run the simulation.we can go through all this sections detailed in the below images.

i. TimeControl

ii. Initialization

iii. FlowControl

iv. ODEControl

v. SignalControl

vi. ThermalControl

vii. ConvergenceRLT

2. Advanced setup -

Advanced Setup also have the different Attributes and we can go through all this sections detailed in the below images.It Contains the different Setups like General,FLow,Mechanics,Restart,Version Changes,Paths,MiscFiles

Each Settings have a different Attributes to run the simulation.we can go through all this sections detailed in the below images.

i. Genral

ii. Flow

iii. Mechanics

iv. Restart

v. VersionChanges

vi. Paths

vii. MiscFiles

3. Output setup -

GT_Post processing data can be done it is used for the accesing the data from the results.It Contains the different Setups like Data_Storage,General,GT_POST_Setup,Flow,ODE_Mech,ScoreboardRLTs,UserScoreboardRLTs,EndOfRunTables.

Each Settings have a different Attributes to run the simulation.we can go through all this sections detailed in the below images.

i. Data_Storage

ii. General

iii. GT-POST_Setup

iv. Flow

v. ODE-Mech

vi. ScoreboardRLTs

vii. UserScoreboardRLTs

viii. EndOfRunTables

4. Plot setup -

Cycle and/or time plots may be requested by selecting the appropriate plot from the "Plot Options" folder within each part. Each of these requests will result in a plot being stored. (This is not true when the specific plot requires a certain modeling option to be used in order to calculate the results that are to be presented in the plot. For example, plots of the pipe wall temperature versus radius will be made only when the wall temperature solver is used in the model.)

Plot Setup, which is found under the "Run" pull-down menu, gives the user a variety of options to change the way in which the plots are requested. If no changes are requested, the Default Values, as specified in the top right corner of the Plot Setup Dialog, will be used. A button called "Remove Plot(s)" is available to remove unwanted plot requests from Plot Setup. All plots requested in individual parts will be stored regardless of whether the user chooses to use Plot Setup.

- Intercooler problem

• 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

Intercooler setup-

Inlet - mass flow rate - 1200 kg/h at 100 deg C

Diameter of cooler inlet and outlet pipe - 50 mm

Outlet - Outlet pressure 2 bar at 30 deg C

Length of CAC - 1000 mm

Keep the default settings in 'Run Setup' and do run the simulation by clicking on 'Finish' button as shown below.

Results -

Pressure drop - 8.37 kPa

Average convective heat transfer rate at CAC - 8.73kW

CONCLUSION -

We have explored the GUI of GT-SUITE and located some features like Time control flag,Time step and solution control ,Integrator/Solver type .

We have explored the Intercooler tutorial and solved one problem based on it (calculated the Average heat transfer at CAC and Pressure drop across the CAC).