2021-12-03T17:33:58Z
https://oa.upm.es/cgi/oai2
oai:oa.upm.es:6768
2016-04-20T15:56:37Z
7374617475733D707562
7375626A656374733D646573636F6E6F63696461
7375626A656374733D6E6176616C
747970653D636F6E666572656E63655F6974656D
WSPH and ISPH Calculations of a Counter-Rotating Vortex Dipole
González Gutierrez, Leo Miguel
Sánchez, J.M.
Macia Lang, Fabricio
Duque Campayo, Daniel
Gómez Goñi, Jesús María
Rodríguez Pérez, Miguel Ángel
Not determined
Naval Engineering
Viscosity and vorticity are magnitudes playing an important role in many engineering physical phenomena such as: boundary layer separation, transition ﬂows, shear ﬂows, etc., demonstrating the importance of the vortical viscous ﬂows commonly used among the SPH community. The simulation presented here, describes the physics of a pair of counter-rotating vortices in which the strain ﬁeld felt by each vortex is due to the other one. Different from the evolution of a single isolated vortex, in this case each vortex is subjected to an external stationary strain ﬁeld generated by the other, making the streamlines deform elliptically. To avoid the boundary inﬂuence, a large computational domain has been used ensuring insigniﬁcant effect of the boundary conditions on the solution. The performance of the most commonly used viscous models in simulating laminar ﬂows, Takeda’s (TVT), Morris’ (MVT) and Monaghan-Cleary’s (MCGVT) has been discussed comparing their results. These viscous models have been used under two different compressibility hypotheses. Two cases have been numerically analyzed in this presentation. In the ﬁrst case, a 2D system of two counter-rotating Lamb O seen vortices is considered. At ﬁrst, the system goes through a rapid relaxation process in which both vortices equilibrate each other. This quasi-steady state is obtained after the relaxation phase is advected at a constant speed and slowly evolves owing to viscous diffusion. The results of the different Lamb-O seen numerical solutions have been validated with good agreement by comparison with the numerical results of a ﬁnite element code (ADFC) solution. A second case, somewhat more complex than the previous one, is a 3D Batchelor vortex dipole obtained by adding an axial ﬂow to the system of the ﬁrst case. The Batchelor vortex model considered here is a classical option normally used to model the structure of trailing vortices in the far-wake of an aircraft.
E.T.S.I. Navales (UPM)
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
2010
info:eu-repo/semantics/conferenceObject
Presentation at Congress or Conference
Proceedings of the 5th International SPHERIC SPH Workshop | 5th International SPHERIC SPH Workshop, 2010 | 23/06/2010 - 25/06/2010 | Manchester, UK
PeerReviewed
application/pdf
eng
http://www.mace.manchester.ac.uk/5thspheric/
info:eu-repo/semantics/openAccess
http://oa.upm.es/6768/