Orthogonal Projection Based Computationally Efficient Algorithm for Deflection Tomography in High Speed Flow Studies

Medhi, Biswajit; Hegde, G. M.; Reddy, K. P. J.; Roy, Debasish; Vasu, Ram Mohan

doi:10.1007/978-3-319-16835-7_72

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…Numerical simulations are performed that help in understanding the flow evolution phenomenon and also used for assessment of the recovered experimental results obtained through the wavefront measuring camera. Shock wave discharge from the open end of a ST to the ambience is numerically simulated by using the commercial CFD software ANSYS FLUENT 13 (R) [40]. Navier-Stokes equations are solved for a single component viscous gas flow by using finite volume method in Cartesian coordinate system.…”

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

“…Navier-Stokes equations are solved for a single component viscous gas flow by using finite volume method in Cartesian coordinate system. Transient model is used for simulating the timedependent nature of the flow evolution process, in which convective fluxes are calculated at the interface of control volume by Roe-FDS scheme [40]. The primitive variables are interpolated at the interface with the help of second order upwind approach [40].…”

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

“…The primitive variables are interpolated at the interface with the help of second order upwind approach [40]. Used numerical method is based on Implicit formulation of the problem where transient part is handled through second-order implicit scheme [40].…”

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

“…Transient model is used for simulating the timedependent nature of the flow evolution process, in which convective fluxes are calculated at the interface of control volume by Roe-FDS scheme [40]. The primitive variables are interpolated at the interface with the help of second order upwind approach [40]. Used numerical method is based on Implicit formulation of the problem where transient part is handled through second-order implicit scheme [40].…”

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

See 3 more Smart Citations

Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera

Medhi

Hegde

Reddy

2019

Optics and Lasers in Engineering

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Quantitative visualization of shock induced complex flow field emanating from the open end of a miniaturized hand-driven shock tube (Reddy tube) is presented. During operation, the planar shock wave of Mach number M i =1.33 (±0.6%) is discharged through the low-pressure driven-section, kept open to ambient atmosphere. From the moment of shock discharge, its aftereffects of evolving flow field are recorded for 300 s  near the exit of the tube by using our newly developed high resolution (16Mpixel) home built wavefront measuring camera setup. The ability of the camera to identify the amplitude and phase of the incident light wave is utilized to measure the flow induced change in phase of the interrogating light beam quantitatively. Information of the evolving flow field with a spatial resolution of 16μm/pixel and time resolution of 50 s  is recorded in repeated runs. The measured phase information is used in an iterative refraction tomographic scheme to recover the 3D-density distribution of the flow field, which reveals the internal features of the domain. Computational fluid dynamic (CFD) simulation is carried out for the same experimental conditions and it is found that recovered experimental density distribution shows good agreement with the results obtained through CFD simulation.

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Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

Section: Numerical Computational Fluid Dynamic (Cfd) Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera

Medhi

Hegde

Reddy

2019

Optics and Lasers in Engineering

Self Cite

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“…From other application areas, e.g. optical flow tomography, the application of ART-type algorithems for tomographic reconstruction based on few projections also is an established method [10,11]. For small-scale problems, electron-beam scanning devices have been developed [12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of fragment reconstruction accuracy with in situ few-view flash x-ray high-speed computed tomography (HSCT)

Moser

Nau

Heusinger

et al. 2019

Meas. Sci. Technol.

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Few-view in situ flash x-ray high-speed computed tomography (HSCT) is a computed tomography (CT) technique used to investigate high-speed phenomena on the timescale of microseconds. The successful application to quantitatively analyze and characterize fragments formed during a 1000 m s−1 impact process onto a ceramic plate with a CT reconstruction from only six x-ray projections has been shown. The method delivers spatially resolved 3D information about the fragments at one point in time. This information is not (or only partially) accessible by alternative experimental methods. Therefore, quantifying the accuracy of the measured data is not directly possible. In order to estimate the precision of the method and the influence of different sources limiting accuracy, a simulation study consisting of 250 virtual experiments was carried out. The border conditions of the study are based on the actual experimental data from the six-view experiment. The results show that steel fragments with a diameter of about 8 mm (volume ~ 300 mm3, weight ~ 2.5 g) can be reconstructed with an averaged relative volume deviation of about 30%. For larger framents, the error reduces down to 10% relative average deviation. The spatial position of the center of mass can be determined with an averaged uncertainty of about 0.8 to 1.2 mm for most fragment sizes.

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Tomographic Visualization of the Hypersonic Flow Field over a Waverider

Nagashetty

Medhi

Sriram

et al. 2017

30th International Symposium on Shock Waves 2

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Orthogonal Projection Based Computationally Efficient Algorithm for Deflection Tomography in High Speed Flow Studies

Cited by 5 publications

References 10 publications

Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera

Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera

Investigation of fragment reconstruction accuracy with in situ few-view flash x-ray high-speed computed tomography (HSCT)

Tomographic Visualization of the Hypersonic Flow Field over a Waverider

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