Convergent Science

CONVERGE™ User Group Meeting 2014

CONVERGE™ UGM 2014Monona Terrace

Monona Terrace sits on the shores of Lake Monona in Madison, Wisconsin



Join us this coming September for our first annual CONVERGE™ User Group Meeting in lovely Madison, Wisconsin at Frank Lloyd Wright’s Monona Terrace.


September 23rd and 24th will include talks by industry leaders, ask an expert sessions, an in-depth review of new features, roundtables, prizes, games, contests and live music.


Get tickets for our Networking Cruise on Lake Monona to take place on the evening of September 23rd and dinner, drinks and trivia at Cooper’s Tavern to take place on the evening of September 24th. Space is limited so please register to ensure your spot.


September 22nd, 25th and 26th will be training days held at Convergent Science’s new office building in Madison. Please note that since the release of the UGM dates, additional training days have been added. See below for details.

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Shifting the paradigm toward predictive CFD












Please click here to download and view the updated agenda.

Transportation Schedule

The transportation schedule is now available to download and view here





Online booking for the Madison Concourse Hotel & Governor’s Club is now closed. Please call us at 830.625.5005 if you need assistance booking a room. 



Please go to the CONVERGE™ UGM 2014 Training Days Eventbrite page by clicking here and register for each individual training session. 

All training will take place at the Convergent Science World Headquarters located at:

6400 Enterprise Lane, Madison, WI 53719

Transportation will be provided to and from the Convergent Science World Headquarters if you are staying at The Madison Concourse Hotel & Governor’s Club. 


Monday, September 22nd, 2014 | CONVERGE™: An Accelerated Introduction | 8a.m. – 5p.m.

It is recommended that a CONVERGE™: An Accelerated Introduction is completed before moving on to the advanced trainings & workshops offered on September 25th & 26th. Training will be from 8:30am to 5pm at our new building. Please register for this training day above.

To be covered…

  • Introduction to CONVERGE™
  • Surface mesh preparation in CONVERGE™ Studio
  • Input files used in CONVERGE™
  • Specifying boundary conditions
  • Solution initialization
  • Volume mesh control strategies 
  • Region definition in CONVERGE™



Thursday, September 25th, 2014 | CONVERGE™: Advanced Topics (Session 1) 

Training topics run concurrently.


Fluid-Structure Interaction Modeling in CONVERGE | 8a.m. – 12p.m.

Rigid body Fluid Structure Interaction (FSI) describes how the the presence of one or more immersed objects affects the flow field and how the forces from the surrounding fluid influence the dynamics of the object. This is useful for problems where an object’s motion is not entirely prescribed and requires a dynamics solver to obtain the object’s translational and rotational position, velocity, and/or acceleration in time. This workshop will discuss the theory behind FSI, the numerics of the dynamics solver, and the coupling of the dynamics solver to the flow solver in CONVERGE. It will also cover several examples highlighting the current capabilities available to users both through the input files and with a user-defined function (UDF). We will work through examples using the 1 degree of freedom (DOF) solver for motion constrained to either one translational or one rotational direction and then focus on full 6 DOF simulations with multiple objects subjected to FSI. Finally, more complex examples that require a UDF for complicated forces and motion restrictions will be discussed.


Advanced Combustion Modeling in CONVERGE | 8a.m. – 12p.m. 

There are a variety of combustion sub-models available for three dimensional combustion modeling in internal combustion (IC) engines. In this workshop, five advanced combustion models will be covered: The delta PDF combustion model (SAGE), the G equation combustion model, the Representative Interactive Flamelet (RIF) combustion model, the 3-Zone extended coherent flame model (ECFM3Z) and the flamelet generated manifold (FGM) (coming in Converge 2.3). Among these models, the G equation model is suitable for premixed spark ignition processes in gasoline engines, and the RIF and ECFM3Z models are used for diffusion controlled diesel engine simulations. SAGE and FGM are generalized combustion models which can be applied to either diffusion controlled diesel engine simulations or premixed gasoline engine simulations. This workshop will mainly focus on the equations and theory of these combustion models, the advantages and disadvantages of each combustion model, and how the combustion models couple with the CFD solver in CONVERGE. Chemical mechanism reduction and knock prediction will be covered briefly as well.


CONVERGE and Rescale | Lunch | 12p.m. – 1p.m

Rescale is a cloud simulation platform that partners closely with Convergent Science to support CONVERGE in the cloud on Rescale’s dynamically scalable on-demand environment. Learn more about how you can instantly scale both software and hardware resources to fully optimize your CAE analyses using Rescale’s customizable hardware and intuitive interface and CONVERGE’s run-time mesh generation CFD solver. This session will take you through how to set up and run a CONVERGE job on Rescale’s platform, how to customize resources for simulations, use case examples, advanced features, and answer common questions associated with running simulations in the cloud. 


Conjugate Heat Transfer modeling in CONVERGE | 1p.m. – 5p.m.

For years CONVERGE has been able to interface with other packages for modeling heat transfer in solids. Now CONVERGE is able to do both CFD and solid heat transfer modeling in the same simulation. This can greatly simplify the process of predicting temperature in solids that are dependent on fluid interfaces, e.g. heads and valves in engines. CONVERGE also has a built-in supercycle feature that takes care of the disparate timescales in the solid and fluid domains by allowing the solid side of the simulation to progress with faster timescales than the fluid. This workshop will introduce two new concepts to CONVERGE: interface boundaries and supercycling.


Genetical Algorithm Optimization in CONVERGE | 1p.m. – 5p.m.

This advanced workshop will focus on model optimization using the CONGO utility, which can be used for Genetic Algorithm (GA) optimization or for Design of Experiments model interrogation (DoE). Different types of optimization and the details of the genetic algorithm methodology will be shown. The setup for the utility, options for parameter selection, and how to run an optimization will be demonstrated using examples. The best practices of optimization (such as model setup, parameter and range selection, search space considerations) and advanced applications like geometry modification will be discussed.



Friday, September 26th, 2014 | CONVERGE™: Advanced Topics (Session 2) + EnSight Full-Day Workshop 

Session 2 and Full-Day EnSight Workshop run concurrently. 


Heat Transfer Mapping in CONVERGE | 8a.m. – 10a.m.

 This advanced workshop will focus on mapping CONVERGE CFD results to different surface files for heat transfer analysis. The process for mapping will be discussed using the CONVERGE HTC_MAP utility, including the methodology of cycle averaging and details of the mapping method. The alignment of geometry for surfaces will be explained and demonstrated. How to use the utility and best practices for mapping will be discussed using examples. Additionally, there will be a brief discussion of best practices for heat transfer prediction in CFD simulations with CONVERGE.


Emissions Modeling in CONVERGE | 8.a.m. – 11a.m.

High-fidelity soot models can reveal detailed information in engine simulations, but the complexity of the models renders them computationally impractical for three dimensional simulations with detailed chemistry. This workshop will be open to users who have basic soot modeling background and would like to have a better understanding of the detailed soot models in CONVERGE. In the present talk, two new detailed soot models, i.e., the particulate mimic (PM) model and the particulate size mimic model (PSM) will be discussed in detail. The following topics will be covered in this workshop. First, the methodologies employed by the detailed soot models, i.e., the method of moments and the sectional method, for the PM and PSM models respectively, will be introduced. Secondly, the acceleration strategies for the detailed soot model coupling with the gas phase chemistry, which renders it possible to apply the detailed soot models for practical engine simulations, will be discussed. The effects of different gas phase mechanisms and important soot parameters which are affecting the modeling results will also be covered to help users gain insight into how the detailed soot models work. A tutorial on case setup and available soot outputs for the detailed soot models will be given. Finally, details of the other emissions models (e.g., NOx) available in CONVERGE will be described.


CONVERGE – GT Power Coupling | 11a.m. – 12p.m.

There are two ways to couple CONVERGE with GT-SUITE: GTLINK and CONVERGE-Lite. In the coupling with GT-LINK, CONVERGE is the master process, which controls the coupling. GT-SUITE provides the dynamic libraries for the API functions. In the coupling with CONVERGE-Lite, GT-SUITE is the master process, which controls the coupling. CONVERGE provides the dynamic library for the API functions. CONVERGE, CONVERGE_STUDIO and POST_CONVERT are the modules of GT-SUITE. This workshop will demonstrate the model settings using both coupling options. Cylinder coupling will also be addressed.


Advanced Spray Modeling in CONVERGE | 1p.m. – 4p.m.

CONVERGE includes state-of-the-art sub-models for simulating liquid spray phenomena in the Lagrangian framework. The current models for liquid breakup, collision and coalesence, vaporization, drag, turbulent dispersion, and drop/wall interaction will be described in this workshop. Particular attention will be given to numerical mesh and parcel number settings for achieving grid convergence for RANS and LES simulations. Finally, details of current research and future spray modeling directions will be provided.


Volume of Fluid Modeling in CONVERGE | 1p.m. – 3p.m.

The Volume of Fluid (VOF) method is one of the most popular numerical techniques for locating moving and deforming interfaces between fluids in multiphase flow simulations. In this workshop, numerical details and some validation calculations of two VOF methods in CONVERGE will be covered. The first VOF method is based on the species mass fraction and the second one is the Piecewise-Linear Interface Calculation (PLIC) scheme. In the mass fraction based VOF, the volume fraction is computed using the mass fraction of each speices. The species mass fractions are governed by the species transport equations. As species can diffuse into each other, this scheme can be used for miscible multiphase flow simulations. This scheme is suitable for compressible multiphase flow calculations. PLIC based VOF is used for tracking the interface between immiscible and incompressible fluids with minimal interface diffusion. This approach approximates the interface locally as a planar surface. Based on the local orientation and the void fraction values, a geometric construction of the interface is performed as a first step. The constructed interface is used for advecting the correct amount of fluids in the neighbouring cells. This method has been tested on a range of problems such as a breaking dam, a rising droplet, and spray injection. Each of these test cases illustrate the ability of the method to track interfaces sharply.



EnSight Full-Day Workshop

Morning Session | Basic Topics | 8a.m. – 12p.m.

  • EnSight screen layout, mouse buttons, function keys and preferences 
  • Reading Data & Part basics
  • Welcome Window, Reading Data into EnSight, Part Definition, Parent Child Philosophy
  • The Parts List
  • Selecting parts, Grouping, and Part Attributes
  • The Color Wheel and Color Palettes 
  • Coloring different parts by Constant Color, or Variables
  • Creating Clip Planes
  • XYZ clip Planes, Plane tool Clips, Vector arrows
  • Saving Images, EnLiten Files and Sessions 
  • Contacting CEI and Support
  • Where to go if you need help

 Afternoon Session | Advanced Topics | 1p.m. – 5p.m.

  • Probes, Queries and Plotters
  • Interactive probes queries and plots, Queries and Plots over Time, Constants over time
  • Iso Surfaces + Flame Propogation
  • Create iso surfaces, use iso surfaces to show Flame propagation.
  • Creating Particle Traces
  • Creating velocity streamlines, Velocity pathlines
  • Particles from Solver
  • Change part node rep, attributes of Measure/particle data
  • Volume rendering*
  • Intro, Structured Box Clip, Adjust Alpha scale.
  • Swirl+Tumble calculation – UDT*
  • How to set up UDT, Use Swirl UTD, Tumble UDT
  • Simulation Time + Flipbooks
  • Change simulation Time – create animation, Flip books

 Extra Topics

  • Create P-Theta plot from external file
  • Swirl ratio – calculation
  • Moving Clip plane (clip plane stays at the center of the Cylinder regardless of position of the Piston) – UDT
  • Comparing sprays at different crank angles
  • Read in *.out files from CONVERGE – UDT



Getting Here

By Plane:

Dane County Regional Airport (airport code MSN) is located minutes from downtown Madison and offers more than 95 daily arrivals and departures. The Dane County Regional airport offers direct non-stop service from the following locations: Atlanta, Chicago, Cincinnati, Cleveland, Dallas-Fort Worth, Denver, Detroit, Minneapolis, New York, Newark, Orlando and Washington, DC.

By Car:

From Milwaukee (1½ hours): From the East via Interstate 94
As you approach the city, follow Highway 30 into Madison. Take the “State Capitol” exit off of Highway 30, and you will then be on East Washington Avenue, which leads directly to the Capitol Square.

From Dubuque (1¾ hour): From the Southwest via Highways 18 & 151
Take the appropriate exit to Highway 151 going north toward the State Capitol. In Madison, Highway 151 will become South Park Street. Follow Park Street to its conclusion to reach UW-Madison. Or, from Park, take a right onto Johnson Street to reach the State Street/Capitol Square area.

From Chicago (2½ hours): From the Southeast via Interstate 90
Take the Hwy 12&18 (Beltline) exit to Madison. If you are going to the Alliant Energy Center or Monona Terrace, exit at John Nolen Drive. If you are going to UW-Madison, exit at Park Street and follow north.

From Green Bay (2½ hours): From the Northeast via Highway 151
Follow Highway 151 toward the State Capitol. You will then be on East Washington Avenue, which leads directly to the Capitol Square.

From Minneapolis (4½ hours): From the North via Interstate 90/94
Take I-90/94 to the Highway 151 exit (southwest) going toward the State Capitol. You will then be on East Washington Avenue, which leads directly to the Capitol Square.


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