HIGH PERFORMANCE COMPUTING SUPPORT FOR UNITED KINGDOM CONSORTIUM ON TURBULENT REACTING FLOWS
Lead Research Organisation:
University of Warwick
Department Name: Sch of Engineering
Abstract
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Organisations
People |
ORCID iD |
| Jennifer Wen (Principal Investigator) |
Publications
Chen Z
(2014)
Extension of the eddy dissipation concept and smoke point soot model to the LES frame for fire simulations
in Fire Safety Journal
Chen Z
(2014)
Large eddy simulation of a medium-scale methanol pool fire using the extended eddy dissipation concept
in International Journal of Heat and Mass Transfer
Dombrovsky L
(2016)
A simplified model for the shielding of fire thermal radiation by water mists
in International Journal of Heat and Mass Transfer
Fukumoto K
(2020)
Numerical simulation of small pool fires incorporating liquid fuel motion
in Combustion and Flame
Fukumoto K
(2018)
Large eddy simulation of upward flame spread on PMMA walls with a fully coupled fluid-solid approach
in Combustion and Flame
Fukumoto K
(2021)
Study on the role of soot and heat fluxes in upward flame spread using a wall-resolved large eddy simulation approach
in Journal of Thermal Analysis and Calorimetry
Han W
(2021)
Spontaneous initiation and development of hydrogen-oxygen detonation with ozone sensitization
in Proceedings of the Combustion Institute
Heidari A
(2017)
Numerical simulation of detonation failure and re-initiation in bifurcated tubes
in International Journal of Hydrogen Energy
Khodadadi Azadboni R
(2017)
Numerical modeling of deflagration to detonation transition in inhomogeneous hydrogen/air mixtures
in Journal of Loss Prevention in the Process Industries
Khodadadi Azadboni R
(2018)
A Computational Fluid Dynamic Investigation of Inhomogeneous Hydrogen Flame Acceleration and Transition to Detonation.
in Flow, turbulence and combustion
| Description | As a partner in UKCTRF, Warwick has started using the Archer facility from June this year to conduct research in three topics: 1. Coupled flame spread and fire modelling 2. The effects of radiation treatment on flame spread modelling 3. Syngas combustion Topics 1 and 3 have since benefited from the use of the HPC resource while Topic 2 is still at code development and debugging. Topic 1: A new pyrolysis model has been implemented into FireFOAM. Treatment has also been introduced for in-depth radiation within the burning solid and the low-temperature near the wall. Validation studies have been conducted with PMMA wall as well as wall fires. The research is now focusing on the treatment of convective heat transfer. Topic 2: Synthetic gas, or syngas, has been widely used for the production of hydrogen, ammonia, methanol, and synthetic oil. It is also being increasingly used as a direct fuel for gas turbine and other combustion systems for power generation. Being a hydrogen-rich gas, syngas raises safety issues involving potential releases from a high-pressure pipeline during the production stage or in transportation. Such releases could result in jet fires of considerable length that might impinge on facilities and pose hazards to personnel. In the present study, the FireFOAM code has been used to predict the general characteristics and thermal radiation hazards of syngas jet fires. Simulations have been carried out for a number of release scenarios in which the exit nozzle diameters and pipeline pressures are varied from 5 to 30 mm and 100 to 500 bar, respectively. Combustion is treated with the Eddy Dissipation Concept (EDC) which has been substantially modified and extended to large eddy simulation by the authors' group [1-2]. The modelling approach follows the same pseudo diameter approximation originally developed by and used by many others as well as the authors' group [4]. For validations, the predictions of FireFOAM with the extended EDC for hydrogen and hydrogen/methane jet fires have been firstly compared with full scale test data. While no test data is available for comparison, the predicted general characteristics and radiation hazards of syngas jet fires are evaluated against that of hydrogen and hydrogen/methane fires. Conclusions will be drawn about the potential hazards of syngas jet fires in terms of flame length, radiative fraction and the changing trends of radiation intensity with heights and distances in comparison with that of hydrogen jet fires. References 1. C.J. Wang, J.X. Wen, Z.B. Chen, S. Dembele, Predicting radiative characteristics of hydrogen and hydrogen/methane jet fires using FireFOAM, International Journal of Hydrogen Energy, In Press, Corrected Proof, Available online 30 April 2014. 2. Changjian Wang, Jennifer X Wen, Predicting radiative characteristics of hydrogen and hydrogen/methane jet fires using FireFOAM, 5th International Conference on Hydrogen Safety, September 9-11, 2013 - Brussels - Belgium. 3. Ewan, B. C. R. and Moodie, K., Structure and Velocity Measurements in Under expanded Jets, Combust. Sci. and Tech. 1986; 45:275-288. 4. Zhang, J., Dembele, S. and Wen J. X., Exploratory Study of Under-expanded Sonic Hydrogen Jets and the Resulting Jet Flames, 5th International Seminar on Fire and Explosion Hazards, April 2007, Edinburgh, UK. The in-house version of FireFOAM 2.2x, which has recently undergone specific development and validation for flame spread studies by the authors and published in Combustion and Flame in 2017. The radiative heat transfer and soot treatment are fully coupled with pyrolysis calculations in the model, which also incorporates appropriate treatment for the reaction time scale in different regimes from laminar through transition to fully turbulent, the effect of in-depth radiation and solid surface regression. Further validation has been conducted in the present study for the predictions of the dimensionless temperature gradient, convective heat transfer coefficient and individual heat flux components on the wall in a small scale wall fire configuration where experimental data is available. On such basis, numerical simulations have been conducted for a large scale flame spread configuration to facilitate detailed analysis of the individual heat flux components on the wall, their respective fractions in the total heat flux and relevant importance in the different regions of the upward spreading flame. A new paper is currently under consideration by the combustion symposium. |
| Exploitation Route | The modified open source CFD code will be released online. The publications will disseminate the methodologies developed to facilitate people implementing into different CFD codes. |
| Sectors | Energy,Environment |
| Description | Professor Wen's team has conducted CFD predictions of potential accidental releases from cryogenic liquid hydrogen tanks to assess the mitigation effects of retention pools in limiting the size of the dispersed hydrogen cloud. The predictions have enabled Air Liquide to establish internal rules about the compulsory requirement for retention pools and the recommended sizes according to the dimensions of the LH2 storage tanks in different facilities. Professor Wen's researchers validated the improved OpenFOAM for hydrogen explosions with the large-scale tests data commissioned by Shell Global Solutions for model validation. The validated code has been supplied to Shell. Shell engineers are using it in design analysis and facility siting to model large scale hydrogen explosions in storage centres, hydrogen or/and multi-fuel refuelling stations [5.7]. In the meantime, Shell has also supplied Warwick FIRE with the in-house developed PDRFOAM, which will enable Professor Wen's group to extend its modelling to deal with more complex geometries. |
| First Year Of Impact | 2019 |
| Sector | Energy,Environment |
| Impact Types | Economic,Policy & public services |
| Description | (LIB STRESS) - In situ stress analysis of lithium-ion battery cell |
| Amount | € 195,454 (EUR) |
| Funding ID | 749512 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 07/2018 |
| End | 07/2020 |
| Description | (TurbDDT) - Predicting flame acceleration and deflagration to detonation transition in industrial scale explosions incorporating the turbulence effects |
| Amount | € 195,454 (EUR) |
| Funding ID | 793072 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 09/2018 |
| End | 09/2020 |
| Description | Improving Hydrogen Safety for Energy Applications through pre-normative research on vented deflagrations (HySEA) |
| Amount | € 1,500,000 (EUR) |
| Funding ID | 671461 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 09/2015 |
| End | 11/2018 |
| Description | LIBRIS (Lithium Ion Battery Research In Safety) |
| Amount | £4,846,466 (GBP) |
| Funding ID | 105296 |
| Organisation | Innovate UK |
| Sector | Public |
| Country | United Kingdom |
| Start | 06/2019 |
| End | 12/2020 |
| Description | Pre-normative REsearch for Safe use of Liquide HYdrogen |
| Amount | € 1,950,000 (EUR) |
| Funding ID | 779613 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 04/2018 |
| End | 03/2021 |
| Description | Preliminary Feasibility Study of Lithium Ion Battery Safety (PreLIBS) |
| Amount | £395,177 (GBP) |
| Funding ID | 133721 |
| Organisation | Innovate UK |
| Sector | Public |
| Country | United Kingdom |
| Start | 08/2018 |
| End | 05/2019 |