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Please try out our program for calculating the gas phase equilibrium state.
|With the continually growing computing power and storage capacity of present-day computers, direct numerical simulation (DNS) is increasingly gaining in importance for carrying out fundamental scientific studies. They allow the partial differential equations that underlie the problem to be solved directly without further parametrisation of fine scales. The difficulty is that model-free simulation of turbulent flows requires a lot of computing power. The turbulent temporal and spatial scales need to be solved in their entirety. DNS can be used for reactive flows for restricted parameter regions and simple geometries.|
Numerical experiments can be carried out in a targeted, model-free way using DNS with full consideration of the intermittent behaviour of the flow, thus permitting profound new insights into the functioning of turbulent flows.
The knowledge obtained through this about the interaction between turbulence, mingling and chemical reaction can then be used to validate existing models on turbulence and mingling, and to possibly improve them.
Within this research focus in the past the following research projects were associated:
BioROBURplus builds upon the closing FCH JU BioROBUR project (direct biogas oxidative steam reformer) to develop an entire pre-commercial fuel processor delivering 50 Nm3/h (i.e. 107 kg/d) of 99.9% hydrogen from different biogas types (landfill gas, anaerobic digestion of organic wastes, anaerobic digestion of wastewater-treatment sludges) in a cost-effective manner. The energy efficiency of biogas conversion into H2 will exceed 80% on a HHV basis, due to the following main innovations:
Design option for the BioRoburplus off-gas burner
The complementary innovations already developed in BioROBUR (advanced modulating air-steam feed control system for coke growth control; catalytic trap hosting WGS functionality and allowing decomposition of incomplete reforming products; etc.) will allow to fully achieve the project objectives within the stringent budget and time constraints set by the call. Prof. Debora Fino, the coordinator of the former BioROBUR project, will manage, in an industrially-oriented perspective, the work of 11 partners with complementary expertise: 3 universities (POLITO, KIT, SUPSI), 3 research centres (IRCE, CPERI, DBI), 3 SMEs (ENGICER, HST, MET) and 2 large companies (ACEA, JM) from 7 different European Countries. A final test campaign is foreseen at TRL 6 to prove targets achievement, catching the unique opportunity offered by ACEA to exploit three different biogas types and heat integration with an anaerobic digester generating the biogas itself.
The current project aims to calculate quantitatively the generation mechanism and propagation of noise caused by turbulent combustion. Fully compressible Large Eddy Simulations (LES), hybrid CFD (Computational Fluid Dynamics)/CAA (Computational Aero-Acoustics) and Direct Numerical Simulation (DNS) are chosen as computational tools. The UTFC combustion model based on a TFC (Turbulent Flame Speed Closure) approach and a FGM (Flamelet Generated Manifold) tabulation procedure has been developed during this project which is used together with compressible LES for turbulent flames. This enables the direct computation of combustion noise from the resolved large scale fluctuations. The DNS will then be applied for investigation of noise within the sub grid scale. The project is connected with three other project partners from TU Darmstadt (Prof. J. Janicka), TU AAchen (Prof. W. Schröder) and TU Berlin (Prof. C.O. Paschereit) who make inkompressible LES, CAA-computation and measurement for the same burner configuration.
More information can be found on this page.