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References & Citations( | )
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Implications of the Tentative Association between GW150914 and a {\it
Fermi}-GBM Transient
Abstract: The merger-driven Gamma-ray Bursts (GRBs) and their associated gravitational
wave (GW) radiation, if both successfully detected, have some far-reaching
implications, including for instance: (i) The statistical comparison of the
physical properties of the short/long-short GRBs with and without GW detection
can test the
(ii) Revealing the physical processes taking
place a (iii) Measuring the velocity of the Gravitational
wave directly/accurately. In this work we discuss these implications in the
case of possible association of GW150914/ GBM transient 150914. We compared GBM
transient 150914 with other SGRBs and found that such an event {may be} a
distinct outlier in some statistical diagrams, possibly due to its specific
binary-black-hole merger origin. However, the presence of a "new" group of
SGRBs with "unusual" physical parameters is also possible. If the outflow of
GBM transient 150914 was launched by the accretion onto the nascent black hole,
the magnetic activity rather than the neutrino process is likely responsible
for the energy extraction and the accretion disk mass is estimated to be $\sim
10^{-5}~M_\odot$. The GW150914/GBM transient 150914 association, {if confirmed,
would} provide the first opportunity to directly measure the GW velocity and
its departure from the speed of the light {should be within} a factor of $\sim
10^{-17}$.
High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
Journal&reference:
The Astrophysical Journal Letters, 827: L16 (2016)
[astro-ph.HE]
[astro-ph.HE] for this version)
Submission history
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城市·招商Numerical simulation of transient turbulent cavitating flows with special emphasis on shock wave dynamics considering the water/vapor compressibility | SpringerLink
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Numerical simulation of transient turbulent cavitating flows with special emphasis on shock wave dynamics considering the water/vapor compressibilityChang-chang Wang (王畅畅)Biao Huang (黄彪)Guo-yu Wang (王国玉)Zhong-ping Duan (段忠平)Bin Ji (季斌)Article
The objective of this paper is to investigate the compressible turbulent cavitating flows with special emphasis on shock wave dynamics, with the water/vapor compressibility taken into account. The simulations are performed by solving the compressible, multiphase unsteady Reynolds-averaged Navier-Stokes equations with Saito cavitation model and SST-SAS turbulence model. The compressibility of both the pure water and vapor is considered by employment of the Tait equation of state for water and ideal gas equation of state for vapor. Results are presented for a 3-D NACA66 hydrofoil fixed at α = 6° and σ =1.25 in partial cavitating flows. Cavity collapse induced shock wave formation and propagation, which is closely related to the compressibility characteristics of cavitating flows, are well predicted. Good performance has been obtained for both the cavity evolution process and cavitation induced pressure signals, especially the cavity collapse induced shock wave emission and its interaction with the attached cavity sheet. The pressure peaks in microseconds accompanying the shock wave are captured. The typical quasi-periodic sheet/cloud cavitation evolution is characterized by the following four stages: (1) the growth of the attached cavity sheet, (2) development of re-entrant flow and attached cavity sheet breakup, (3) attached cavity sheet rolling up and cavity cloud shedding, and (4) cloud cavity collapse, shock wave emission and propagation. The cloud cavity collapse induced shock wave dynamics is supposed to be the major origin of cavitation instabilities.Turbulent cavitating flows compressibility re-entrant flow shock wave cavitation instability OpenFOAM This is a preview of subscription content,
to check access.Unable to display preview.&This work was supported by the Open Foundation of State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, the Graduate Technological Innovation Project of Beijing Institute of Technology (Grant No. ).[1]Wang G., Senocak I., Shyy W., et al. Dynamics of attached turbulent cavitating flows [J]. Progress in Aerospace Sciences, ): 551–581.[2]Huang B., Young Y., Wang G., Shyy W. Combined experimental and computational investigation of unsteady structure of sheet/cloud cavitation [J]. Journal of Fluids Engineering, ): 071301.[3]Huang B., Zhao Y., Wang G. Large eddy simulation of turbulent vortex-cavitation interactions in transient sheet/ cloud cavitating flows [J]. Computers and Fluids, 3–124.[4]Huang B., Wang G., Zhao Y. Numerical simulation unsteady cloud cavitating flow with correction model [J]. Journal of Hydrodynamics, ): 26–36.[5]Gopalan S., Katz J. 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Properties of water and stream in SI-Units [M]. Berlin Heidelberg, Germany: Springer, 1981.[44]Decaix J., Goncalves E. Time-dependent simulation of cavitating flow with k-l turbulence models [J]. International Journal for Numerical Methods in Fluids, ): .[45]Egorov Y., Menter F. R. Development and application of SST-SAS turbulence model in the DESIBER project (Peng S. H., Haase W. Advances in hybrid RANS-LES modeling. Notes on numerical fluid mechanics and multi-disciplinary design) [M]. Berlin Heidelberg, Germany: Springer, 1–270.[46]Wang C., Wu Q., Huang B. et al. Numerical investigation of cavitation vortex dynamics in unsteady cavitating flow with shock wave propagation [J]. Ocean Engineering, : 424–434.[47]Sagaut P. Large eddy simulation for incompressible flows [M]. Berlin Heidelberg, Germany: Springer, 2002.[48]Chen Y., Chen X., Li J. et al. Large eddy simulation and investigation on the flow structure of the cascading cavitation shedding regime around 3D twisted hydrofoil [J]. Ocean Engineering, : 1–19.[49]Wang B. L., Liu Z. H., Li H. Y. et al. On the numerical simulations of vertical cavitating flows around various hydrofoils [J]. Journal of Hydrodynamics, ): 926–938.[50]Eddington R. B. Investigation of supersonic phenomena in a two-phase (liquid-gas) tunnel [D]. Doctoral Thesis, Pasadena, USA: California Institute of Technology, 1967.Chang-chang Wang (王畅畅)1Biao Huang (黄彪)1Guo-yu Wang (王国玉)1Zhong-ping Duan (段忠平)1Bin Ji (季斌)21.School of Mechanical EngineeringBeijing Institute of TechnologyBeijingChina2.State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhanChina