Vortex formation and evolution process in an impulsively starting jet from long pipe

2019 ◽  
Vol 176 ◽  
pp. 134-143 ◽  
Author(s):  
X.K. Wang ◽  
B.Y. Su ◽  
Y.L. Li ◽  
C. Wang
Keyword(s):  
Vortex Formation ◽  
Evolution Process ◽  
Formation And Evolution ◽  
Starting Jet

scholarly journals THE EFFECT OF THE INITIAL BED PERTURBTION TO THE SAND BAR FORMATION AND EVOLUTION PROCESS

2007 ◽  
Vol 51 ◽  
pp. 1045-1050
Author(s):  
Kensuke KOBAYASHI ◽  
Yasuyuki SHIMIZU ◽  
Sanjay GIRI ◽  
Yasuharu WATANABE
Keyword(s):  
Evolution Process ◽  
Formation And Evolution ◽  
Sand Bar ◽  
Bar Formation

Research on the Morphological Evolution of Sanye House Village Located in Farming-Pastoral Zone of Eastern Inner Mongolia

2013 ◽  
Vol 361-363 ◽  
pp. 64-67
Author(s):  
Jing Kong ◽  
Li Qiu ◽  
Ming Ma ◽  
Juan Wang ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Inner Mongolia ◽  
Pattern Analysis ◽  
Morphological Evolution ◽  
Settlement Pattern ◽  
Evolution Process ◽  
Development History ◽  
Pattern Development ◽  
Formation And Evolution ◽  
Three Stages ◽  
Eastern Inner Mongolia

San ye House Village are located in Farming-pastoral zone of eastern Inner Mongolia after a hundred years of development history, from mainly nomadic settlements into agricultural and pastoral settlements. The evolution of the settlements' pattern experienced a total of three stages. With the combination of different periods of settlement pattern analysis, the characteristics of San ye House village settlement pattern development is studied and the reasons for its formation and evolution process are presented.

scholarly journals ASCA Study of Shaplay Supercluster

1998 ◽  
Vol 188 ◽  
pp. 300-301 ◽  
Author(s):  
H. Hanami
Keyword(s):  
Temperature Distribution ◽  
Evolution Process ◽  
Observational Cosmology ◽  
Clusters Of Galaxies ◽  
Formation And Evolution

We observed five clusters of galaxies in Shapley supercluster with ASCA; A3562, SC13290-313, SC1327-312, A3558 and A3556, which are candidates for interacting clusters since their separation and relative velocities are only 1Mpc and 700-1000km/s (e.g. Raychaudhury et al. '91, Breen et al. '94, Scaramella et al. '89). Main purpose of mapping observations is to make clear the formation and evolution process of the clusters of galaxies in a supercluster. ASCA gives essential informations of ICM like the temperature distribution related to the dynamics; the interactions due to the infalling and merging events. They are important tests for observational cosmology (e.g. Hanami '93).

Seismic P-wave receiver function modelling of Archean cratonic crust: A global perspective

2020 ◽  
Author(s):  
Poulami Roy ◽  
Kajaljyoti Borah
Keyword(s):  
Continental Crust ◽  
Receiver Function ◽  
Function Analysis ◽  
Crustal Thickness ◽  
Global Perspective ◽  
P Wave ◽  
Evolution Process ◽  
S Wave ◽  
Economic Significance ◽  
Formation And Evolution

<p>Cratons are representative of the oldest cores of continental crusts. Study of cratons is important  as they preserve the pristine nature of continental crusts as well as they have economic significance as a major source of the world's mineral deposits. The crustal thickness, crustal composition, structure and physical properties of crust-mantle transition (the Moho) are the key parameters for understanding the formation and evolution of continental crust. The ratio of  seismic P-wave and S-wave velocity (Vp/Vs) is used as a parameter to understand the petrologic nature of the Earth's crust. Using these parameters, we address the crustal properties of all Archean cratons. The teleseismic P-wave receiver function analysis reveals that all the Eoarchean (4-3.6 Ga) cratons (Superior, North Atlantic Craton, North China Craton, Yilgarn, Zimbabwe, Kaapvaal) have crustal thickness ranges between 34-42 km and Vp/Vs ratio 1.68-1.79, the Paleoarchean (3.6-3.2 Ga) cratons (Baltic shield, Pilbara, Tanzania, Grunehogna) have 29-52 km crustal thickness and Vp/Vs ratio 1.7-1.85, the Mesoarchean (3.2-2.8 Ga) cratons (Sao Francisco, Guapore, Yangtze, Antananarivo) have 36-53 km thickness and Vp/Vs ratio 1.7-1.9, and Neoarchean (2.8-2.5 Ga) cratons (Guiana, Anabar, Gawler, Napier, Tarim) have 36-59 km thickness and Vp/Vs ratio 1.64-1.95. The nature of crust-mantle transition is overall sharp and flat.  We also found that the crusts which are stabilized earlier, are thinner compared to the later stabilized crusts. Our findings are well-correlated with the craton evolution process predicted by Durrheim and Mooney (1994), where older crusts are thin due to delamination process and relatively younger crusts are thick due to basaltic underplating. Our result of higher Vp/Vs ratio in the relatively younger crusts corroborates with the mafic nature of the crust whereas the older crusts are felsic-intermediate resulting lower Vp/Vs ratio. Our study is unique as it includes most of the global cratons and suggests a global model of continental crust formation and evolution process.</p>

scholarly journals VORTEX FORMATION AND EVOLUTION IN PLANET HARBORING DISKS UNDER THERMAL RELAXATION

2015 ◽  
Vol 810 (2) ◽  
pp. 94 ◽  
Author(s):  
Aiara Lobo Gomes ◽  
Hubert Klahr ◽  
Ana Lucia Uribe ◽  
Paola Pinilla ◽  
Clément Surville
Keyword(s):  
Vortex Formation ◽  
Thermal Relaxation ◽  
Formation And Evolution

Formation regimes of vortex rings in negatively buoyant starting jets

2013 ◽  
Vol 716 ◽  
pp. 470-486 ◽  
Author(s):  
C. Marugán-Cruz ◽  
J. Rodríguez-Rodríguez ◽  
C. Martínez-Bazán
Keyword(s):  
Vortex Ring ◽  
Richardson Number ◽  
Vortex Formation ◽  
Vortex Rings ◽  
Vortex Identification ◽  
Buoyant Flows ◽  
Formation Number ◽  
Secondary Vortices ◽  
Starting Jet ◽  
Negatively Buoyant

AbstractThe formation of vortex rings in negatively buoyant starting jets has been studied numerically for different values of the Richardson number, $\mathit{Ri}$, covering the range of weak to moderate buoyancy effects ($0\leq \mathit{Ri}\leq 0. 20$). Two different regimes have been identified in the vortex formation and the transition between them takes place at $\mathit{Ri}\approx 0. 03$. The vorticity distribution inside the vortex ring after pinching off from the trailing stem as well as the total amount of circulation it encloses (characterized by the formation number, $F$) show different behaviours with the Richardson number in the two regimes. The differences are associated with the different mechanisms by which the head vortex absorbs the circulation injected by the starting jet. While secondary vortices are engulfed by the leading vortex before separating from the trailing jet in the weak buoyancy effects regime ($0\lt \mathit{Ri}\lt 0. 03$), this phenomenon is not observed in the moderate buoyancy effects regime ($0. 03\lt \mathit{Ri}\lt 0. 2$). Moreover it is shown that the formation number of a negatively buoyant vortex ring can be determined by considering that its dynamics are similar to that of a neutrally buoyant vortex but propagating with velocity corresponding to the negatively buoyant one. Based on this simple idea, a phenomenological model is presented to describe quantitatively the evolution of the formation number with the Richardson number, $F(\mathit{Ri})$, obtained numerically. In addition, the limitations of different vortex identification methods used to evaluate the vortex properties in buoyant flows are discussed.

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