Numerical visualization of shock tube-generated vortex–wall interaction using a fifth-order upwind scheme

Kundu, Abhishek; De, S. K.; Thangadurai, Murugan; Dora, C. L.; Das, Debopam

doi:10.1007/s12650-016-0362-x

Cited by 11 publications

(2 citation statements)

References 22 publications

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“…It is worth mentioning that a future numerical study could focus on the effect of the nozzle shear condition on the shear layer and its thickness and vortical structures in millimeter-size under-expanded jets. Specifically, a no-slip viscous nozzle wall condition with very fine spatial resolutions (comparable to those reported by Murugan et al (2013) and Kundu et al (2016)) could be used along with high order discretization schemes to investigate the formation and evolution of vortical structures and Kelvin-Helmholtz type instabilities in this type of flow.…”

Section: Shear Layer Characteristicsmentioning

confidence: 99%

LES and RANS modelling of under-expanded jets with application to gaseous fuel direct injection for advanced propulsion systems

Hamzehloo

Aleiferis

2019

International Journal of Heat and Fluid Flow

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A density-based solver with the classical fourth-order accurate Runge-Kutta temporal discretization scheme was developed and applied to study under-expanded jets issued through millimeter-size nozzles for applications in highpressure direct-injection (DI) gaseous-fuelled propulsion systems. Both large eddy simulation (LES) and Reynoldsaveraged Navier-Stokes (RANS) turbulence modelling techniques were used to evaluate the performance of the new code. The computational results were compared both quantitatively and qualitatively against available data from the literature. After initial evaluation of the code, the computational framework was used in conjunction with RANS modelling (k-ω SST) to investigate the effect of nozzle exit geometry on the characteristics of gaseous jets issued from millimeter-size nozzles. Cylindrical nozzles with various length to diameter ratios, namely 5, 10 and 20, in addition to a diverging conical nozzle, were studied. This study is believed to be the first to provide a direct comparison between RANS and LES within the context of nozzle exit profiling for advanced high-pressure injection systems with the formation of under-expanded jets. It was found that reducing the length of the straight section of the nozzle by 50% resulted in a slightly higher level of under-expansion (~2.6% higher pressure at the nozzle exit) and ~1% higher mass flow rate. It was also found that a nozzle with 50% shorter length resulted in ~6% longer jet penetration length. At a constant nozzle pressure ratio (NPR), a lower nozzle length to diameter ratio resulted in a noticeably higher jet penetration. It was found that with a diverging conical nozzle, a fairly higher penetration length could be achieved if an under-expanded jet formed downstream of the nozzle exit compared to a jet issued from a straight nozzle with the same NPR. This was attributed to the radial restriction of the flow and consequently formation of a relatively smaller reflected shock angle. With the conical nozzle used in this study and a 30 bar injection pressure, an under-expanded hydrogen jet exhibited ~60% higher penetration length compared to an under-expanded nitrogen jet at 100 μs after start of injection. Moreover, the former jet exhibited ~22% higher penetration compared to a nitrogen jet issued through the conical profile with 150 bar injection pressure.

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Section: Shear Layer Characteristicsmentioning

confidence: 99%

LES and RANS modelling of under-expanded jets with application to gaseous fuel direct injection for advanced propulsion systems

Hamzehloo

Aleiferis

2019

International Journal of Heat and Fluid Flow

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“…The advection upstream splitting method (or AUSM) was proposed to provide an alternative approach to low-diffusion flux-splitting methods [77,78]. This approach is based on recognizing that the inviscid flux consists of a distinct convective flux and a pressure flux.…”

Section: Hll Schemementioning

confidence: 99%

Resolution and Energy Dissipation Characteristics of Implicit LES and Explicit Filtering Models for Compressible Turbulence

Maulik

San

2017

Fluids

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Solving two-dimensional compressible turbulence problems up to a resolution of 16, 384 2 , this paper investigates the characteristics of two promising computational approaches: (i) an implicit or numerical large eddy simulation (ILES) framework using an upwind-biased fifth-order weighted essentially non-oscillatory (WENO) reconstruction algorithm equipped with several Riemann solvers, and (ii) a central sixth-order reconstruction framework combined with various linear and nonlinear explicit low-pass spatial filtering processes. Our primary aim is to quantify the dissipative behavior, resolution characteristics, shock capturing ability and computational expenditure for each approach utilizing a systematic analysis with respect to its modeling parameters or parameterizations. The relative advantages and disadvantages of both approaches are addressed for solving a stratified Kelvin-Helmholtz instability shear layer problem as well as a canonical Riemann problem with the interaction of four shocks. The comparisons are both qualitative and quantitative, using visualizations of the spatial structure of the flow and energy spectra, respectively. We observe that the central scheme, with relaxation filtering, offers a competitive approach to ILES and is much more computationally efficient than WENO-based schemes.

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Numerical Simulation of Interaction of Blast Wave Generated from Cannon with Wall at Different Pressure Ratio

Khan

Kundu

Paul

2020

Lecture Notes in Mechanical Engineering

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Numerical visualization of shock tube-generated vortex–wall interaction using a fifth-order upwind scheme

Cited by 11 publications

References 22 publications

LES and RANS modelling of under-expanded jets with application to gaseous fuel direct injection for advanced propulsion systems

LES and RANS modelling of under-expanded jets with application to gaseous fuel direct injection for advanced propulsion systems

Resolution and Energy Dissipation Characteristics of Implicit LES and Explicit Filtering Models for Compressible Turbulence

Numerical Simulation of Interaction of Blast Wave Generated from Cannon with Wall at Different Pressure Ratio

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