Convergence of the contour dynamics method

1991 ◽  
Vol 7 (3) ◽  
pp. 261-276 ◽  
Author(s):  
Juan Soler
Keyword(s):  
Contour Dynamics ◽  
Dynamics Method

Finite-core hetons: stability and interactions

2000 ◽  
Vol 423 ◽  
pp. 127-154 ◽  
Author(s):  
M. A. SOKOLOVSKIY ◽  
J. VERRON
Keyword(s):  
Parameter Space ◽  
The Other ◽  
Geometrical Parameters ◽  
Stationary States ◽  
Contour Dynamics ◽  
Surgery Technique ◽  
Special Case ◽  
Dynamics Method

The dynamics of vertically compensated two-layer vortices (hetons) with finite cores are examined within the context of the quasi-geostrophic approximation on the f-plane. The two-layer version of the contour dynamics method is used, and complemented by the so-called contour surgery technique. Special attention is paid to two-heton interactions when the initial locations of the vortex patches are symmetrical. A classification of the different regimes observed is made according to external parameters, namely geometrical parameters and stratification. In this parameter space, novel quasi-stationary states resulting from collisions between two hetons may be observed: (i) formation of a configuration consisting of two-layer vortices moving in opposite directions and, as a special case, a configuration analogous to the ‘klapstoss’ billiard shot, (ii) absorption of one heton by the other and subsequent movement of a new dipole, (iii) formation of two-layer dipoles, larger than the original hetons, associated with rotating peripheral satellite eddies in their wakes. Some of these results may have implications for the analysis of mesoscale vortices in the ocean.

Simulation of the instability of axisymmetric vortices using the contour dynamics method

1985 ◽  
Vol 20 (1) ◽  
pp. 28-34 ◽  
Author(s):  
V. F. Kozlov ◽  
V. G. Makarov
Keyword(s):  
Contour Dynamics ◽  
Dynamics Method

scholarly journals Cyclostrophic vortices in polar regions of rotating planets

2001 ◽  
Vol 8 (4/5) ◽  
pp. 301-311 ◽  
Author(s):  
V. Goncharov ◽  
V. Pavlov
Keyword(s):  
Temperature Field ◽  
Time Dependent ◽  
Polar Regions ◽  
Two Dimensional ◽  
Contour Dynamics ◽  
Inviscid Incompressible Fluid ◽  
Stationary Observer ◽  
Contour Curvature ◽  
Dynamics Method

Abstract. Multi-petal, rotating vortices can form in two-dimensional flows consisting of an inviscid incompressible fluid under certain conditions. Such vortices are principally nonlinear thermo-hydrodynamical structures. The proper rotation of these structures which leads to time-dependent variations of the associated temperature field can be enregistred by a stationary observer. The problem is analyzed in the framework of the contour dynamics method (CDM). An analytical solution of the reduced equation for a contour curvature is found. We give a classification of the solutions and compare the obtained results with observational data.

Study on Interactive Multi-resolution Molecular Dynamics Method

2000 ◽  
Vol 20 (1Supplement) ◽  
pp. 43-46
Author(s):  
Ken-ichi SAITOH ◽  
Takashi DOI ◽  
Masao KOMAYA ◽  
Takehiko INABA
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Method ◽  
Dynamics Method

scholarly journals Development, Modeling and Control of a Dual Tilt-Wing UAV in Vertical Flight

Drones ◽  
2020 ◽  
Vol 4 (4) ◽  
pp. 71
Author(s):  
Luz M. Sanchez-Rivera ◽  
Rogelio Lozano ◽  
Alfredo Arias-Montano
Keyword(s):  
Dynamic Model ◽  
Attitude Control ◽  
Test Bench ◽  
Aerodynamic Coefficients ◽  
Nonlinear Dynamic Model ◽  
Modeling And Control ◽  
Drag And Lift ◽  
And Control ◽  
Dynamics Method ◽  
Indoor And Outdoor

Hybrid Unmanned Aerial Vehicles (H-UAVs) are currently a very interesting field of research in the modern scientific community due to their ability to perform Vertical Take-Off and Landing (VTOL) and Conventional Take-Off and Landing (CTOL). This paper focuses on the Dual Tilt-wing UAV, a vehicle capable of performing both flight modes (VTOL and CTOL). The UAV complete dynamic model is obtained using the Newton–Euler formulation, which includes aerodynamic effects, as the drag and lift forces of the wings, which are a function of airstream generated by the rotors, the cruise speed, tilt-wing angle and angle of attack. The airstream velocity generated by the rotors is studied in a test bench. The projected area on the UAV wing that is affected by the airstream generated by the rotors is specified and 3D aerodynamic analysis is performed for this region. In addition, aerodynamic coefficients of the UAV in VTOL mode are calculated by using Computational Fluid Dynamics method (CFD) and are embedded into the nonlinear dynamic model. To validate the complete dynamic model, PD controllers are adopted for altitude and attitude control of the vehicle in VTOL mode, the controllers are simulated and implemented in the vehicle for indoor and outdoor flight experiments.

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