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 Wysłany: Nie 20:51, 12 Gru 2010 Temat postu: ugg milano Stratified fluid in the horizontal move |
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The level of a stratified fluid moving body of internal waves generated
Theory, point source and point sink arranged on the axis, the sources and sinks from the slender body is approximately equal to the length, intensity nRU, the point source and point sink results of superposition of a simplified \Kinin (KLcos0) cos0 \25) (26) selected as a submerged body length 100m, 8m diameter, ellipsoid,[link widoczny dla zalogowanych], a considerable size and conventional submarines, while Dawson is also in order to facilitate point source model with the results compared. As the speed of conventional submarines is generally not very high, so the speed selected range of 2 ~ 14kn. Table 1 as a potential body at different speed, depth of the sea under the center line of the wake maximum velocity components, U values for the submerged body section after the 200 ~ 300m, in units of m / s. calculations take into account the second order internal wave modes. the potential for the same body,[link widoczny dla zalogowanych], Dawson's results are: the submersible speed 2.5m / s, .64 deep route. Naval University of Engineering during the first 18 35m, u a 9.034mm / s; speed 0.5m / s, 35m deep when the aircraft, u a 2.609mm / s, when the flight depth 124m, Uma a 1.096mm / s. The theoretical calculation will be the results of this model and Dawson Comparing the calculated results, very similar, but Dawson mathematical point source model the process much more complex than the model in Table 1 .7 Conclusion wake center line submerged body lI maximum velocity components in this paper does not use the equations of motion Boussinesq approximation, but directly through the linearized Euler equations are the equations of motion; free surface conditions are not rigid-lid approximation used, instead of using the linear free surface condition, the physical model is more reasonable. When the fluid is both the density, this model Kelvin wave model degenerates to a certain extent, shows that the model is reliable. The point source model and Dawson compared the wave model, the results are very close,[link widoczny dla zalogowanych], but mathematically Dawson model is much more complex. in the flow field calculation In order to overcome the numerical difficulties, only considered \The results obtained by the above method a good degree of approximation, so we have reason to speculate on the internal waves in stratified flow for such approximation does not produce much error, even for the near field. From the dispersion curve can be seen that each mode has a minimum value of internal waves by the relation a =- icsec0 we know that there are corresponding minimum. If the minimum with that, with ... that the minimum value,[link widoczny dla zalogowanych], 0 a ' z ~ arcsin Therefore, the speed component of expression (24) ~ (26) in the imminent end of the integral should be replaced by the integral lower limit value of i. As is generally not large, comparatively large population (particularly for high modulus state), so i is close to pi / 2. This table Mingnei Bo mainly as scattered waves, rather than the shear wave, that is, within the wave crest is closer to the central axis parallel to the wake, the wake of internal wave wake is narrower than the Kevlin . with the speed increases, the internal wave wake of the wave field will narrow angle. References: [13BonnetonP, ChomazJM, HopfingerEJ.Internalwavesproducedbytheturbulentwakeofaspheremovinghorizontallyinastratifiedfluid [-J3.FluidMech. ,1993,[link widoczny dla zalogowanych],254:23-4O. E23MilesJW.Leewavesinastratifiedflow (part1 : Thinbarrier) [-J3.FluidMech., 1968,32 (3) :549-567. [3] VoisionBInternalwavegenerationinuniformlystratifyiedfluids (part1: GreenSfunctionandpointsources) [J] FluidMech. ,1991,231:439-480. [4] You Bingli . Ordinary Differential Equations added tutorial EM3. Beijing: People's Education Press, 1981.
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