A New Parallel Cut-Cell Cartesian CFD Code for Rapid Grid Generation Applied to In-Cylinder Diesel Engine Simulations

Senecal, P. K.; Richards, Keith; Pomraning, Eric; Yang, Tao; Dai, Meizhong; McDavid, Robert M.; Patterson, Mark; Hou, Shuhai; Shethaji, Tushar A.

doi:10.4271/2007-01-0159

Cited by 254 publications

(130 citation statements)

References 33 publications

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“…The computational model was built by means of the CONVERGE CFD code [33]. A reduced reaction mechanism made up of 45 species and 142 reactions [34] including NOx formation (thermal, N 2 O and NO 2 pathways) describes the combined oxidation of n-heptane (PRF 0) and iso-octane (PRF 100).…”

Section: Computational Model Description and Validationmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

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Several studies carried out with the aim of improving the RCCI concept in terms of thermal efficiency conclude that the main cause of the reduced efficiency at light loads is the reduced combustion efficiency. The present study used both a 3D computational model and engine experiments to explore the effect of the oxygen concentration and intake temperature on RCCI combustion efficiency at light load. The experiments were conducted using a single-cylinder heavy-duty research diesel engine adapted for dual fuel operation.Results suggest that it is possible to achieve an improvement of around 1.5% in the combustion efficiency with both strategies studied; the combined effect of intake temperature and in-cylinder fuel blending as well as the combined effect of oxygen concentration and incylinder fuel blending (ICFB). In addition, the direct comparison of both strategies suggests that the combustion losses trend is mainly associated to the in-cylinder equivalence ratio stratification, which is determined by the diesel to gasoline ratio in the blend since the injection timing is kept constant for all the tests. Moreover, the combined effect of the intake temperature and ICFB promotes a slight improvement in the combustion losses over the combined effect of the oxygen concentration and ICFB. KEYWORDS

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Section: Computational Model Description and Validationmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

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“…CONVERGE also utilizes UDS to locally stabilize flow, when numerical error occurs with CDS [14]. Criteria for local upwind scheme is proprietary and not available to public.…”

Section: Numerical Setupmentioning

confidence: 99%

“…CONVERGE of Convergent Science Inc. [14] was used for evaluating the effect of parallel computing environment on solution determinacy. For the purpose, all cases in Table 2 was simulated with different number of cores for each case.…”

Section: Numerical Setupmentioning

confidence: 99%

Effect of Parallel Computing Environment on the Solution Consistency of CFD Simulations—Focused on IC Engines

Keum¹,

Grover²,

Gao³

et al. 2017

ENG

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For CFD results to be useful in IC engine analysis, simulation results should be accurate and consistent. However, with wide spread use of parallel computing nowadays, it has been reported that a model would not give the same results against the same input when the parallel computing environment is changed. The effect of parallel environment on simulation results needs to be carefully investigated and understood. In this paper, the solution inconsistency of parallel CFD simulations is investigated. First, the concept of solution inconsistency on parallel computing is reviewed, followed by a systematic CFD simulations specific to IC engine applications. The solution inconsistency against the number of CPU cores was examined using a commercial CFD code CONVERGE. A test matrix was specifically designed to examine the core number effect on engine flow, spray and combustion submodels performance. It was found that the flow field simulation during the gas exchange process is the most sensitive to the number of cores among all submodels examined. An engineering solution was developed where local upwind scheme was used to control the variability, which showed good performance. The implication of the observed inconsistency was also discussed.

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“…The simulations shown in this paper employed the "blob" injection method of Reitz and Diwakar [20] in which "parcels" of liquid with a characteristic size equal to the effective nozzle diameter are injected into the computational domain. The atomization of the liquid blobs/ parcels and subsequent droplets was simulated with models based on the Kelvin-Helmholtz (KH) and Rayleigh-Taylor (RT) instability mechanisms without the use of a breakup length [21]. The No Time Counter (NTC) collision method of Schmidt and Rutland [22] was used for the reported simulations.…”

Section: Liquid Spray Modelingmentioning

confidence: 99%

Cycle to Cycle Variation Study in a Dual Fuel Operated Engine

Pasunurthi¹,

Jupudi²,

Wijeyakulasuriya³

et al. 2017

SAE Technical Paper Series

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A New Parallel Cut-Cell Cartesian CFD Code for Rapid Grid Generation Applied to In-Cylinder Diesel Engine Simulations

Cited by 254 publications

References 33 publications

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Effect of Parallel Computing Environment on the Solution Consistency of CFD Simulations—Focused on IC Engines

Cycle to Cycle Variation Study in a Dual Fuel Operated Engine

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