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    Large Eddy Simulation of Vaporizing Sprays Considering Multi Injection Averaging and Grid Convergent Mesh Resolution

    Source: Journal of Engineering for Gas Turbines and Power:;2014:;volume( 136 ):;issue: 011::page 111504
    Author:
    Senecal, P. K.
    ,
    Pomraning, E.
    ,
    Xue, Q.
    ,
    Som, S.
    ,
    Banerjee, S.
    ,
    Hu, B.
    ,
    Liu, K.
    ,
    Deur, J. M.
    DOI: 10.1115/1.4027449
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A stateoftheart spray modeling methodology, recently presented by Senecal et al. (2012, “Grid Convergent Spray Models for Internal Combustion Engine CFD Simulations,â€‌ Proceedings of the ASME 2012 Internal Combustion Engine Division Fall Technical Conference, Vancouver, Canada, Paper No. ICEF201292043; 2013 “An Investigation of Grid Convergence for Spray Simulations using an LES Turbulence Model,â€‌ Paper No. SAE 2013011083) is applied to large eddy simulations (LES) of vaporizing sprays. Simulations of noncombusting Spray A (ndodecane fuel) from the engine combustion network are performed. An adaptive mesh refinement (AMR) cell size of 0.0625 mm is utilized based on the accuracy/runtime tradeoff demonstrated by Senecal et al. (2013, “An Investigation of Grid Convergence for Spray Simulations using an LES Turbulence Model,â€‌ Paper No. SAE 2013011083). In that work, it was shown that grid convergence of key parameters for nonevaporating and evaporating sprays was achieved for cell sizes between 0.0625 and 0.125 mm using the dynamic structure LES model. The current work presents an extended and more thorough investigation of Spray A using multidimensional spray modeling and the dynamic structure LES model. Twenty different realizations are simulated by changing the random number seed used in the spray submodels. Multirealization (ensemble) averaging is shown to be necessary when comparing to local spray measurements of quantities such as mixture fraction and gasphase velocity. Through a detailed analysis, recommendations are made regarding the minimum number of LES realizations required for accurate prediction of diesel sprays. Finally, the effect of a spray primary breakup model constant on the results is assessed.
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      Large Eddy Simulation of Vaporizing Sprays Considering Multi Injection Averaging and Grid Convergent Mesh Resolution

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    contributor authorSenecal, P. K.
    contributor authorPomraning, E.
    contributor authorXue, Q.
    contributor authorSom, S.
    contributor authorBanerjee, S.
    contributor authorHu, B.
    contributor authorLiu, K.
    contributor authorDeur, J. M.
    date accessioned2017-05-09T01:08:03Z
    date available2017-05-09T01:08:03Z
    date issued2014
    identifier issn1528-8919
    identifier othergtp_136_11_111504.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/154838
    description abstractA stateoftheart spray modeling methodology, recently presented by Senecal et al. (2012, “Grid Convergent Spray Models for Internal Combustion Engine CFD Simulations,â€‌ Proceedings of the ASME 2012 Internal Combustion Engine Division Fall Technical Conference, Vancouver, Canada, Paper No. ICEF201292043; 2013 “An Investigation of Grid Convergence for Spray Simulations using an LES Turbulence Model,â€‌ Paper No. SAE 2013011083) is applied to large eddy simulations (LES) of vaporizing sprays. Simulations of noncombusting Spray A (ndodecane fuel) from the engine combustion network are performed. An adaptive mesh refinement (AMR) cell size of 0.0625 mm is utilized based on the accuracy/runtime tradeoff demonstrated by Senecal et al. (2013, “An Investigation of Grid Convergence for Spray Simulations using an LES Turbulence Model,â€‌ Paper No. SAE 2013011083). In that work, it was shown that grid convergence of key parameters for nonevaporating and evaporating sprays was achieved for cell sizes between 0.0625 and 0.125 mm using the dynamic structure LES model. The current work presents an extended and more thorough investigation of Spray A using multidimensional spray modeling and the dynamic structure LES model. Twenty different realizations are simulated by changing the random number seed used in the spray submodels. Multirealization (ensemble) averaging is shown to be necessary when comparing to local spray measurements of quantities such as mixture fraction and gasphase velocity. Through a detailed analysis, recommendations are made regarding the minimum number of LES realizations required for accurate prediction of diesel sprays. Finally, the effect of a spray primary breakup model constant on the results is assessed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLarge Eddy Simulation of Vaporizing Sprays Considering Multi Injection Averaging and Grid Convergent Mesh Resolution
    typeJournal Paper
    journal volume136
    journal issue11
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4027449
    journal fristpage111504
    journal lastpage111504
    identifier eissn0742-4795
    treeJournal of Engineering for Gas Turbines and Power:;2014:;volume( 136 ):;issue: 011
    contenttypeFulltext
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