Improvement in systematic error in background-oriented schlieren results by using dynamic backgrounds

Reichenzer, Frieder; Schneider, Mike; Herkommer, Alois

doi:10.1007/s00348-021-03285-6

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…However, this cost should reduce significantly in the next years. Examples of current trends in BOS research include 3D applications [6,7,[34][35][36], quantifications and/or improvement of BOS features [5,23,[37][38][39], the use of smartphones [40], and the visualization of convective indoor air flows [41]. In several of these trends, hidden grid BOS can represent a useful tool thanks to its features.…”

Section: Discussionmentioning

confidence: 99%

Hidden Grid Background Oriented Schlieren in studying convective flows

Ambrosini

Rubeis

Paoletti

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, we present a new BOS (Background Oriented Schlieren), based on a hidden grid, for studying heat flows. In the setup, we record a grid-based intensity pattern whose phase map carries information about the temperature gradient. The background (undistorted) pattern is hidden in the light source. Quantitative analysis is obtained by a windowed Fourier transform approach. Some experimental results are given to demonstrate the feasibility of the technique.

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Section: Discussionmentioning

confidence: 99%

Hidden Grid Background Oriented Schlieren in studying convective flows

Ambrosini

Rubeis

Paoletti

et al. 2023

J. Phys.: Conf. Ser.

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Performance of Background Oriented Schlieren with different background patterns and image processing techniques

Vinnichenko

Pushtaev

Plaksina

et al. 2023

Experimental Thermal and Fluid Science

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Numerical and experimental investigations of flow features over a wedge exposed to supersonic flow at high Reynolds numbers

Cakir,

Grossir,

Saracoglu

et al. 2024

Physics of Fluids

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Numerical simulation tools and experimental measurement techniques are required to provide accurate description of flow features in application relevant scales and boundary conditions enroute to realizing the design and integration of high-speed arial platforms. A case of 10° wedge exposed to Mach 3.5 supersonic flow at high Reynolds numbers provides an opportunity to conduct a comparative analysis between the numerical and experimental tools that are suitable for investigation of application relevant scales. Due to its superior scalability and the recently advanced sensitivity and resolution range, background oriented schlieren is utilized to provide non-intrusive quantification of density varying flow features. On the other hand, the numerical simulations are performed by means of two main turbulence treatment schemes of Reynolds averaged Navier–Stokes (RANS) and large eddy simulations (LES) employing k–ω shear stress transport turbulence and localized dynamic k-equation sub-grid scale models, respectively. Although the lower computational cost of RANS is referred to as an advantage over LES in large scale simulations, the accuracy deficit is discussed in terms of establishing an acceptable trade-off. Accordingly, physical orientations and intensities of the captured flow features and the respective physical, optical, and numerical features driven by the specifications of the experimental and numerical configurations and their impact on the description of relevant flow features are detailed.

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Improvement in systematic error in background-oriented schlieren results by using dynamic backgrounds

Cited by 3 publications

References 16 publications

Hidden Grid Background Oriented Schlieren in studying convective flows

Hidden Grid Background Oriented Schlieren in studying convective flows

Performance of Background Oriented Schlieren with different background patterns and image processing techniques

Numerical and experimental investigations of flow features over a wedge exposed to supersonic flow at high Reynolds numbers

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