Risio B.,RECOM Services GmbH |
Berreth A.,RECOM Services GmbH |
Zuckerman S.,University of Versailles |
Koliai S.,University of Versailles |
And 5 more authors.
Advances in Parallel Computing | Year: 2010
Developing parallel high-performance applications is an error-prone and time-consuming challenge. Performance tuning can be alleviated considerably by using optimisation tools, either by simply applying a stand-alone tool or by applying a tool chain with a number of more or less integrated tools covering different aspects of the optimisation process. In the present paper, we demonstrate the benefits of the latter approach on the industrial combustion modelling software RECOM-AIOLOS. The applied tool chain comprises both low-level and high-level analysis of the application: using the MAQAO tool, the assembly code generated by the compiler can be analysed statically, aiming at possible optimisations on a loop level. Another important aspect is identifying and optimising bottlenecks in memory access and cache utilisation. On a higher level, efficient usage of parallel programming paradigms (MPI, OpenMP) is verified by the VAMPIR and SCALASCA frameworks. Combining the different optimisation strategies leads to a significant overall performance improvement. © 2010 The authors and IOS Press. All rights reserved.
Wei X.,CAS Institute of Mechanics |
Guo X.,CAS Institute of Mechanics |
Li S.,CAS Institute of Mechanics |
Han X.,RECOM Services GmbH |
And 3 more authors.
Energy and Fuels | Year: 2012
In the paper, the numerical simulation program coupled with the detailed chemical reaction mechanism and computational fluid dynamics software was applied to calculate the concentration profiles of CO, NO x, and SO x during co-combustion of coal and biomass. The predicted data are compared to experimental results in an entrained flow combustion reactor to validate the numerical method for pulverized coal combustion. The characteristics of pollutant emissions in co-combustion with coal and three typical kinds of biomasses (Swedish wood, Danish straw, and sewage sludge) are also investigated. NO formation is significantly affected by the reactor temperature, and an increasing temperature obviously enhances the NO concentration. In the range of the calculated temperature, the final SO 2 emission level is not obviously influenced by the temperature. Co-combustion technology could effectively reduce the pollutant emissions, and the effect is proportional to the blending ratio of biomass. The biomass with low contents of nitrogen and sulfur and a high volatile content and lower heating value is an ideal co-fired fuel to reduce NO and SO 2 emissions. © 2011 American Chemical Society.