Numerical simulation of continuous bubbles motion behavior with different lance spacings DOI Open Access

Xinting Tong,

Xiaohui Zhang, Rui Feng

et al.

Thermal Science, Journal Year: 2023, Volume and Issue: 27(4 Part A), P. 2801 - 2811

Published: Jan. 1, 2023

The lance is a critical component of the bottom-blowing pool melting process, and its placement has an important impact on pool?s gas-liquid two-phase flow. In this study, mathematical model process established, flow pattern, trajectory, wake vortex, velocity bubbles under four spacings are simulated. Results show that there three basic bubble patterns appear in field: coalesce before leaving nozzle (Pattern ?), after no coalescence during rise III). pattern varies from Pattern I to III with increase spacing. intensity influence vortex decreases. Q (the second Galilean invariant gradient tensor ?v) value small, but structural distribution complex. Moreover, large difference between gas liquid at beginning injection, them decreases so average turbulent kinetic energy initially increases sharply, then approaches dynamic equilibrium. top bottom velocities consistent, fluctuation orderly. greater spacing is, disturbance is. mixing effect D = 0.2 m best among spacings.

Language: Английский

A study on the wake structure of an ascending submersible with silk flexible appendages using continuous wavelet transform and dynamic mode decomposition DOI
Fei Yan,

G. Zhang,

Akira Rinoshika

et al.

Experimental Thermal and Fluid Science, Journal Year: 2024, Volume and Issue: unknown, P. 111323 - 111323

Published: Sept. 1, 2024

Language: Английский

Citations

1
Four-dimensional particle tracking velocimetry measurements of unsteady three-dimensional vortex onset and progression for 5415 straight ahead, static drift, and pure sway DOI Open Access
Yugo Sanada, Zachary Starman, Shanti Bhushan

et al.

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(10)

Published: Oct. 1, 2023

Large-scale towed system four-dimensional particle tracking velocimetry (4DPTV) implementation and measurements are presented for towing tank tests a naval combatant 5415 ship model straight ahead, static drift β = 10°, pure sway βmax 10° conditions. The results, the first time, provide instantaneous volumetric flow field data around including near hull surface, complete description of sonar dome 3D unsteady vortex separation onset progression due to 4DPTV larger measurement volume higher rates in comparison with previous results using tomographic image (TPIV); thereby, providing essential required assessment current hybrid Reynolds-averaged Navier–Stokes/large eddy simulation turbulence modeling capabilities guidance necessary improvements. is summarized compared TPIV, camera calibration procedures, trigger systems, synchronization motion. Analysis reduction procedures core detection voxel labeling techniques, described. identification complex separations breakdown aided complementary detached simulations. vortex–vortex interaction process visualized from datasets. pros cons vs between second- third-generation visualization technique, statistical convergence error analysis port discussed. Plans increased spatial resolution additional techniques detailed also

Language: Английский

Citations

1
FUN3D Mesh Adaptation Simulations for the 4th AIAA High-Lift Prediction Workshop Case 1a DOI

Stephen L. Wood,

Michael A. Park

AIAA Aviation 2019 Forum, Journal Year: 2022, Volume and Issue: unknown

Published: June 20, 2022

View Video Presentation: https://doi.org/10.2514/6.2022-3394.vid This paper describes in detail the FUN3D Mesh adaptation simulation results for Case 1a of 4th AIAA High-Lift Prediction Workshop (HLPW-4). The Stabilized Finite Element library with is used along Negative Spalart-Allmaras One-Equation Model to simulate fully turbulent free-air flow around High Lift version Common Research at three flap settings. Meshes are adapted using multi-scale and goal-oriented metrics. presented discussion focuses on predicted differences between Coefficients lift, drag, pitching moment within 7% values measured QinetiQ 5m Wind Tunnel each setting. Predicted surface pressures skin friction distributions show inconsistent discrepancies measurements across Consequently, increments these figures merit not well predicted. These predictions consistent submissions HLPW-4 from other RANS-SA methods. Visualizations Liutex vortex cores colored by angular velocity as possible new quantitative qualitative perspective solution evaluation.

Language: Английский

Citations

1
Numerical simulation of continuous bubbles motion behavior with different lance spacings DOI Open Access

Xinting Tong,

Xiaohui Zhang, Rui Feng

et al.

Thermal Science, Journal Year: 2023, Volume and Issue: 27(4 Part A), P. 2801 - 2811

Published: Jan. 1, 2023

The lance is a critical component of the bottom-blowing pool melting process, and its placement has an important impact on pool?s gas-liquid two-phase flow. In this study, mathematical model process established, flow pattern, trajectory, wake vortex, velocity bubbles under four spacings are simulated. Results show that there three basic bubble patterns appear in field: coalesce before leaving nozzle (Pattern ?), after no coalescence during rise III). pattern varies from Pattern I to III with increase spacing. intensity influence vortex decreases. Q (the second Galilean invariant gradient tensor ?v) value small, but structural distribution complex. Moreover, large difference between gas liquid at beginning injection, them decreases so average turbulent kinetic energy initially increases sharply, then approaches dynamic equilibrium. top bottom velocities consistent, fluctuation orderly. greater spacing is, disturbance is. mixing effect D = 0.2 m best among spacings.

Language: Английский

Citations

0