Summer 2003

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GoldSim News


Tips and Tricks


Knowledge Base


Model Library


What's Cooking



In some cases, when multiple users are jointly developing a model, you may want to ensure that someone does not inadvertently modify a portion of the model. You can accomplish this by either sealing or locking Containers in the model. If a Container is sealed, it warns the user if they try to edit any of its contents. If a Container is locked, none of the contents can be modified at all. You can seal or lock a Container via the Container's properties dialog.



The GoldSim Knowledge Base contains articles addressing frequently asked questions, workarounds for known problems, and advice on applying GoldSim. The Knowledge Base is available from within the GoldSim Resource Center (GRC). A few of the recent additions include:

Article 30: Problems with specifying correlations.

Article 31: Why does GoldSim need to modify DLLs during installation?

Article 32: Problems viewing index in Help file.

We encourage you to visit the Knowledge Base, as even expert users are likely to find useful information there.



The GoldSim Model Library allows GoldSim users to build on the experience and knowledge of others by sharing models. The Library is available from within the GoldSim Resource Center (GRC).

Within the last few months we have added two models to the model library:

Model 31: Flow Divider Custom Element.

Model 32: Simple Discrete Event Model (Processing Widgets at a Warehouse).

If you have a model that you think would be worthwhile to post to the library, please send it, along with text describing the model, to



Welcome to the Summer 2003 Issue of the GoldSim Newsletter!

Published quarterly, our goal is to provide information that helps you get the most out of GoldSim. We also hope that the Newsletter can act as a vehicle to build connections between users within the GoldSim community.

Each newsletter delivers the latest GoldSim news, as well as a number of regular items. This one includes tips from the GoldSim developers, a list of new models added to the GoldSim Model Library, a list of new GoldSim Knowledge Base articles, and a description of new features that the GoldSim Development Team is currently working on. Each Newsletter is archived on our website so you can revisit old issues.

Since this newsletter is for you, we encourage you to send us your comments and contributions. If you send us a contribution and we use it, we will acknowledge you in the Newsletter. Send your contributions to

The GoldSim Technology Group


Second Annual GoldSim User Conference a Success

The Second International User Conference was held on June 17-20 at the Washington Athletic Club in Seattle, Washington. This 4-day event had 50 attendees from 9 countries. Almost all the attendees participated in either the two-day Basic GoldSim Concepts course or the one-day Advanced GoldSim course held prior to the User Conference. The conference included 19 technical presentations. The presentations are available (in PowerPoint) from within the GoldSim Resource Center.

GoldSim On-Line Help System Released in May

In May 2003, we released an extensive context-sensitive on-line Help system for GoldSim. The Help system essentially contains all of the information that is currrently in the printed User's Guide, but adds powerful navigation capabilities (including keyword and full text search, related topics lists, and hyperlinked cross references).

To complement the Help file, the User's Guide was also updated, with the primary change being the addition of detailed index (with over 1000 entries). If you have an older version of GoldSim (without Help), you can download the Help file from the GoldSim Resource Center.


Wired Magazine Article Discusses GoldSim

GoldSim was discussed in the April 2003 issue of Wired Magazine. GoldSim is discussed in an article entitled "Do or Die at Yucca Mountain" by David Ewing Duncan. The article describes the U.S. Department of Energy's proposed repository for the nation's spent nuclear fuel at Yucca Mountain, Nevada.

The article discusses the technology that the Department of Energy has employed to determine whether or not the waste can be safely disposed of at the site. GoldSim provides the computational framework to carry out this analysis, and is the primary tool that is being used to predict the long-term performance of the facility.

GoldSim Featured in Manufacturing Economics Textbook

Several GoldSim models are included in the manufacturing economics textbook "Manufacturing in Real-Time: A Guide for Managers and Engineers in an Age of Smart Machines" by Gian Frontini and Scott Kennedy.

The book was published in May 2003 by Butterworth-Heinemann and is available at The authors created a series of GoldSim models to illustrate key concepts discussed in the book and included the files and the GoldSim Player (a free run-time version of GoldSim) on a CD which is distributed with the book.



The GoldSim development team is hard at work preparing for the release of version 8 in September. In addition to adding and polishing numerous little features, here are some of the bigger things you can look forward to:

  • A new Reliability Module, which will be bundled and available at no additional charge with GoldSim Pro. This module adds some versatile and powerful new elements to help simulate the performance of complex engineered systems.

  • A new Convolution element, which lets you project the future consequences of events in your model. For example, if you sell 1,000 new cars this month, what are your future liabilities for warranty repairs? Convolution lets you project the consequences of your model's history into its future.

  • Auto-layering. Ever get annoyed by influence-lines getting in front of your elements? We're adding an option to automatically push graphics to the back, put influence-lines in the middle, and keep elements on top of your graphic views.

  • Container-specific timesteps. If part of your model (e.g., a container) requires short time steps, but the rest doesn't, you will be able to specify shorter steps just for that part.

  • More graphics formats will be supported. You will be able to insert more types of graphics into your models, and GoldSim will compress and manage them more efficiently.

  • Contaminant Transport-the CT and RT modelers will also get some new capabilities.

    • A new 'direct transfer' option for mass flux will be added to the existing advective and diffusive capabilities. This new option provides a very general first-order transfer process for cases that aren't advective or diffusive.

    • Contaminant species can have up to four daughter products.

    • Cell-nets can span multiple Containers.

If you're interested in helping us to test any of these capabilities, please send us an email at You may have to put up with a bug or two, but you'll be able to provide input and your assistance will be greatly appreciated. We'd also appreciate any suggestions that you might have for new GoldSim features!


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