Direct Numerical Simulation Of Autoignition In A Jet In A .
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsDirect Numerical Simulation of Autoignition in aJet in a Cross-FlowAmmar AbdilghanieMay 15, 2013Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsTable of contents1Motivation for Simulating Reactive JICFComputational ChallengesResolution Requirements for DNS2Nek5000 SEM-based CFD codeNEK5000 StrengthsParallel Efficiency3DNS of Autoignition4Sensitivity of JICF to Cross-flow Temperature5Improved Mesh DesignMesh OverviewImporting Mesh6QuestionsAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsComputational ChallengesResolution Requirements for DNSOverview of JICFMixture tendency to autoignite & stabilize.Understanding flame stablization mechanism.Passive control of flash-back hazard.Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsComputational ChallengesResolution Requirements for DNSTurbulence & mixing caused by myriad vortical structures(Horse-shoe, CVP , wake vortices.etc)Resolve Kolmogorov & Batchelor scales.Flame/Reaction zone thickness.Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsComputational ChallengesResolution Requirements for DNSDetailed chemistry to accurately capture local extinction &reignition.Differential diffusion effects through multicomponenttransport models. η 3N Re 9/4δ0u Re νDδ SLAmmar Abdilghanie(1)(2)(3)Direct Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsNEK5000 StrengthsParallel EfficiencyOverview of SEMVariational formulation , like FEM with high order basisfunction & GLL quadrature.Domain decomposition into E deformedquadrilateral/hexahedral elements ( h & p refinements).High order accuracy (resolve fine scales of turbulent flows).Minimal numerical dispersion.Rapid Convergence (exponential for simple geometries).Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsNEK5000 StrengthsParallel EfficiencyRecast tensor products into efficient mxm kernels optimizedfor BG architecture.Scalable (O(106 ) procs) MG iterative solver with low iterationcount.Efficient automated domain decomposition strategies toensure load balancing.Efficient communication strategies for inter-element dataexchange.Efficient Parallel IO.Readily integrated with UD plug-ins/modules for specializedphysics.Stiff ODE integrators (CVODE for thermo-chemistrysub-system).Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsNEK5000 StrengthsParallel EfficiencyParallel Efficiency can be defined as:η N1 t(N1 )N2 t(N2 )(4)where N1 N2Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsOverview of Simulation and Post-processingAuxiliary channel simulation to generate time-dependent inletBC.Preheated cross-flow air fills the domain initially (t 0).Main reactive run.Post-processing runs using Nek5000.Visualization using VisIt parallel architecture.Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestions( Animation of JICF for Tcf 930K .)Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestions( Animation of JICF for Tcf 950K .)Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsTime History of Integral Heat Release RateAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsLocal Ignition Delay EstimateAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsMixture PreparationAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsJet DeformationAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsAerodynamic Stablization of FlameAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsAmmar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsMesh OverviewImporting MeshCubit Mesh GeneratorAllows for journal files using APREPRO and PYTHON#!pythonimport ## Geometry ######### Channel Floor ########################’)Cylinder height 1.0Cylinder radius 0.1Lxs 1.0# xcoordinate of cylinder center lineLx [Ldom, Lxs-0.5*Lsq, Lsq, Ldom-(Lxs 0.5*Lsq)]Ly [2.0*math.pi, ((1.0*math.pi)-(0.5*Lsq)-(Lyref)) ,Lyref, Lsq , Lyref , ((1.0*math.pi)-(0.5*Lsq)-(LyrLz [ h , 3*ra, 2*ra , 4*ra , ra]#####Partitition the volume into 9 partitions horizontally and four vertically: Blockscount 0for j in range(1,len(Ly)):for i in range(1,len(Lx)):for k in range(1,Nzb):cubit.cmd("brick x " str(Lx[i]) " y " str(Ly[j]) " z " str(Lz[k]))count count 1cubit.cmd(’Volume {Id("volume")} Name’ ’"blok’ str(count) ’"’)cubit.cmd(’move volume blok’ str(count) ’ location x ’ str(dispx[i]) ’ y ’ str(dispy[j]) ’#Internal cylinder(s)for k in range(1,Nzb):cubit.cmd(’create Cylinder height ’ str(Lz[k]) ’ radius ’ str(Cylinder radius))Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsAmmar AbdilghanieMesh OverviewImporting MeshDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsAmmar AbdilghanieMesh OverviewImporting MeshDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsMesh OverviewImporting MeshMesh can be exported in many formats:- Native cubit formatcubit.cmd(’save as "/homes/aabdilghanie/JicfLowReMesh.cub" overwrite’)- FLUENT CFD (.msh format)cubit.cmd(’Export Fluent "/home/aelg/3dmesh" volume all Overwrite’)Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsMesh OverviewImporting MeshBasic OptionsMesh can be partitioned and converted to .h5m using MOAB:mbpartmbconvertNek5000 can then be run by linking MOAB libraries.Alternatively a grid can be dumped in Exodus II format andconverted to Nek-native .rea or .rea2 files using in-house Fortranroutines.Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Motivation for Simulating Reactive JICFNek5000 SEM-based CFD codeDNS of AutoignitionSensitivity of JICF to Cross-flow TemperatureImproved Mesh DesignQuestionsThank You!Ammar AbdilghanieDirect Numerical Simulation of Autoignition in a Jet in a Cross
Direct Numerical Simulation of Autoignition in a Jet in a Cross-Flow Ammar Abdilghanie May 15, 2013 . Passive control of ash-back hazard. Ammar Abdilghanie Direct Numerical Simulation of Autoignition in a Jet in a Cross-Flow. Motivatio
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