Validation predictions of a 13 m/s cross-wind fire for Fuego and the University of Waterloo dataset.

Abstract

Detailed herein are the results of a validation comparison. The experiment involved a 2 meter diameter liquid pool of Jet-A fuel in a 13 m/s crosswind. The scenario included a large cylindrical blocking object just down-stream of the fire. It also included seven smaller calorimeters and extensive instrumentation. The experiments were simulated with Fuego. The model included several conduction regions to model the response of the calorimeters, the floor, and the large cylindrical blocking object. A blind comparison was used to compare the simulation predictions with the experimental data. The more upstream data compared very well with the simulation predictions. The more downstream data did not compare very well with the simulation predictions. Further investigation suggests that features omitted from the original model contributed to the discrepancies. Observations are made with respect to the scenario that are aimed at helping an analyst approach a comparable problem in a way that may help improve the potential for quantitative accuracy. 3 AcknowledgementsThe experimental work described herein is a result of funding through the Weapon System Engineering Certification Program (C6).The experiments were performed thanks to an extensive effort by Elizabeth Weckman at the University of Waterloo, and her team of scientists including Cecilia Lam, Eerik Randsalu, Jennifer Weisinger, Chad Young, Gord Hitchman, Mike Hitchman, and Andy Barber. We gratefully acknowledge the hard work and long hours invested by the team to ensure the successful completion of the cross-wind fire experiments. We also acknowledge the help provided by Chuck Hanks setting up the tests and the data acquisition, and Richard Simpson. Richard provided data acquisition, photographic, and experimental design expertise. His blood and sweat are appreciated.The calculations are a result of an extensive effort that goes beyond the authors of this report. The Fuego development team, including Stefan Domino, Greg Wagner, and James Sutherland has been very helpful in reviewing code input and providing suggestions on how to design the tests. They are also responsible for maintaining and verifying the code, which has been performed remarkably well. Sheldon Tieszen and Amalia Black have also provided useful suggestions on modeling methods and general use of the Fuego code.Mary White and Michael Borden contributed to the generation of calculation meshes. Their contributions were important to the success of the project.ACS funding of this endeavor is gratefully acknowledged through the Advanced Deployment program.4

Fire Model Validation for Gas Temperatures and Radiative/Convective Partitioned Heat Flux

“…Figure 3 shows prediction results for the two meshes. In a previous study [12], we found the second non-linear step (i.e., the second Picard loop) induces an increase in the non-linear residual, and requires several more to recover. We generally find simulation predictions with Fuego to be relatively similar with 5 PL and beyond for this type of transient problem.…”

“…The effect of this discretization is examined in detail later in this paper. Radiation discretization has been examined in other studies [12], and found to be relatively insensitive when examining locations engulfed in a fire, and is thus not considered herein. A Picard loop (PL) is a non-linear iteration taken within a time step.…”

Predicting the Climatic Resistance of the Material and the Durability of the Structural Elements of the Composite Tower of the Power Line

“…Currently, climatic resistance of materials and products made from them, usually, is determined by results of short-term tests carried out in climatic chambers -accelerated climatic tests [12,13]. This approach was applied by specialists from RS Technologies Inc. (Canada) to assess the service life (durability) of their products and, in particular, of power transmission line towers in different climatic zones [14]. The experimental program of artificial climatic influence (analogue of accelerated climatic tests) includes exposure of samples in heat chambers with xenon artificial light lamps and water fog for up to 1.5 years.…”