Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session ZC19: Jets: General |
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Chair: Lukasz Klotz, Warsaw University of Technology Room: 250 C |
Tuesday, November 26, 2024 12:50PM - 1:03PM |
ZC19.00001: A thread-safe lattice Boltzmann model for multicomponent turbulent jet simulations on GPUs. Luiz Hegele, Andrea Montessori, Marco Lauricella We employ an optimized multicomponent lattice Boltzmann (LB) model to simulate axisymmetric turbulent jets of a fluid in a stationary, immiscible environment over a broad spectrum of dynamic conditions. The implementation of the multicomponent LB code on graphic processing units (GPUs) achieves peak performance with a notable reduction in memory usage. It preserves the algorithmic simplicity characteristic of standard LB computing and, being based on a high-order extension of the thread-safe LB algorithm, allows for stable simulations at extremely low viscosities. This proposed method offers promising prospects for high-performance computing simulations of realistic turbulent flows with interfaces on GPU-based architectures. |
Tuesday, November 26, 2024 1:03PM - 1:16PM |
ZC19.00002: ABSTRACT WITHDRAWN
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Tuesday, November 26, 2024 1:16PM - 1:29PM |
ZC19.00003: Modeling of Multi-Nozzle Plume Physics for Supersonic Retropropulsion David Wu, Karl Toepperwien, Matthias Ihme We model multi-nozzle plume physics for supersonic retropropulsion (SRP), a crucial technology for landing humans on Mars. SRP is where rocket engines decelerate a spacecraft by thrusting in the opposite direction of its descent. We address the complex interactions between jet plumes and the freestream flow, which are essential for accurate deceleration modeling. |
Tuesday, November 26, 2024 1:29PM - 1:42PM |
ZC19.00004: Focusing of liquid jets induced by the collapse of gas bubbles at a liquid-air interface. Ulisses J Gutiérrez Hernández, Pedro A Quinto-Su, Claus-Dieter Ohl, David Fernández Rivas In this work the focusing of jets induced by the collapse of gas bubbles at a liquid-air interface is presented. |
Tuesday, November 26, 2024 1:42PM - 1:55PM |
ZC19.00005: CFD Analysis of Archer Fish-Inspired Water Jets for Enhanced Industrial Cleaning Applications Varsha Yadhati Exploring Archer fish's unique water jet mechanism to address challenges in cleaning sensitive industrial equipment. By analyzing the fish's ability to generate powerful, precisely aimed jets, the research employs Computational Fluid Dynamics (CFD) tools—OpenFOAM, ANSYS FLUENT, and Comsol Multiphysics — to simulate these jets and validate the findings with experimental data. The study examines destabilization mechanisms and compares the performance of these CFD packages to identify the most reliable software for multiphase flows. The results have potential applications in improving industrial cleaning processes by leveraging insights from the Archer fish's hunting strategy. |
Tuesday, November 26, 2024 1:55PM - 2:08PM |
ZC19.00006: Flow characteristics and entrained bubble dynamics of underwater plunging jet measured by time-resolved three-dimensional Lagrangian particle tracking velocimetry Jinho Oh, Hyunduk Seo, Kyung Chun Kim Plunging water jet onto a water pool is widely utilized in various industry field to promote heat and mass transfer. However, studies to measure flow field at air entrainment condition have rarely reported. In this study, we investigate gas-liquid multiphase flow field generated by plunging jet and air entrainment using time-resolved three-dimensional particle tracking velocimetry (4-D PTV) measurement technique. 4 high-speed cameras were installed to measure bubbly flow in a water tank with 16 angles and alternative illumination of blue and white LEDs is adopted to get each particle and bubble images. 3-D Lagrangian particle tracking with Shake-the-Box (STB) algorithm and vortex-in-cell sharp (VIC#) reconstruction were used to obtain flow field from measured particle images and bubble properties are calculated by binarized bubble images. 3-D Lagrangian particle tracking shows well-tracked result without any trajectory cut-off. Eulerian reconstructed flow field shows axisymmetric, and axial mean velocity profiles follows a Gaussian function. Axial turbulent intensity at the center is a unity at the center and maximum turbulent intensity of radial, azimuthal direction is one-fifth of axial turbulent intensity. Bubble equivalent diameter has large standard deviation because of existence of both large bubbles from air entrainment and small bubbles from bubble collapse. Despite of the existence of bubbles, impinging jet is similar to typical free shear flow. |
Tuesday, November 26, 2024 2:08PM - 2:21PM |
ZC19.00007: High-speed schlieren and particle image velocimetry of a highly-efficient atmospheric plasma jet Neil Narwekar, Muhammad Rizwan Akram, Abbas Semnani, Omid Amili Cold plasma jets present challenges in characterization due to their multifaceted, non-equilibrium, and transient nature, necessitating high spatiotemporal resolution. Building on our work from last year, we systematically perform flow visualization of an atmospheric plasma jet designed with a novel mechanism. This energy-efficient jet is a helium plasma plume exiting from a glass capillary tube with an inner diameter of 0.9 mm, which passes through a gap region of an evanescent-mode cavity resonator. The specific design of the cavity concentrates the electric field mainly over the 100s of µm critical gap, and thus gas breakdowns even at very low values of input microwave power. The plasma jet is generated at 2.45 GHz with an input power in the range of 0.5 to 10 W. A Z-type high-speed schlieren imaging system is used to study the hydrodynamic characteristics of the jet within a steady-state flow rate range of 1 to 7 SLPM. We perform imaging of the jet both with and without plasma to clearly observe the effects of plasma actuation on parameters such as jet core size, spread angle, shear layer unsteadiness, and the mixing of the helium jet with the surrounding air. Additionally, we introduce sodium chloride crystals into the plasma jet to create a so-called dusty plasma. These particles are leveraged as seeding to perform high-speed planar PIV, allowing to quantify the jet’s velocity statistics. This benchmarking study offers detailed information for potential applications in flow control and propulsion systems. |
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