Free video about water waves. This free video was created for you by http://epsos.de and can be used for free under the creative commons license with the attribution of epSos.de as the original author of this water waves video. Thank you for supporting the creative commons movement !! In water waves is under dispersion in particular the dependence of the phase velocity (wave celerity) of the wavelength or of the frequency understood. Gravity waves propagate faster on, the greater their wavelength or the smaller its frequency. On the other hand, waves with a given wavelength over deeper water a larger phase velocity than shallower water. In contrast, spread capillary waves whose restoring force results solely from the surface tension, the faster, the shorter they are. The group velocity is the speed at which a wave group (ie, the intensity maximum of several overlapping waves) moves whose wavelengths only little different. The ratio of the phase velocity for the group velocity determines the type of the dispersion. Is the phase velocity for all partial waves waves of the same group, are group and phase velocities are identical. This is not the case, there is dispersion. Herein is the wavelength and the dispersion of the phase velocity. Depending on the sign and magnitude of the differential quotient the group velocity is smaller, bigger or equal to the phase velocity. We distinguish normal dispersion, anomalous dispersion and dispersionless wave propagation. In the present low-water conditions, the phase velocity is twice the group velocity. The red dot overtakes on his way from left to right, two green dots. New waves seem to appear at the tip of the wave group, grow in height until they reach the center of the group and disappear at the beginning of the group. In most cases the particle velocities (orbital speeds) are much smaller than the phase velocity for gravity waves. Dispersion of water waves relates generally dispersion of the frequency of the waves. Waves that are dispersed will have different phase speed and group speed, while the non-dispersive waves will have equal phase and group speed. Water Waves that propagate with longer wavelengths and periods, moves more quickly than those who have shorter wavelength and period. Fluid dynamics is a sub-discipline of the mechanics of fluids. The fluid dynamics branches into other disciplines such as: the aerodynamics and hydrodynamics. Fluid mechanics has a wide range of applications, including calculating forces and moments that cause the motion of fluids in trouble from the most mundane to the most complex. The word fluid includes water, air, suspensions (which is how some drugs are present), and oil and its derivatives. Likewise, the word dynamic includes causing movement with the same forces. The objectives of the study of fluid dynamics depend on the particular problem that needed solving. For example, when the flow that occurs when coating the paper, an objective may be to determine the conditions under which the thickness of the coating film which is formed is even discussed. Also in oil recovery, a problem may be the prediction of barrels of oil that can be extracted from a reservoir. The study of fluids is very large and it is for them to branches such as fluid dynamics has reason to be. Thrown stones into the water and flow obstacles create waves, propelled ships accompanied a bow wave. earthquake can tsunamis cause. On the latter, and tidal waves will no further reference is made ​​at this point, but preferably by wind generated surface waves of the sea are treated depending on the water depth. In water waves are surface waves at the interface between water and air. After Walter Munk are thus all water surface elevations with period lengths of tens of seconds to hours meant. For wavelengths less than 4 mm which determines the surface tension of the water the properties of the capillary in which the strength of the water strong dissipative effect effects. At wavelengths greater than 7 cm the mass inertia, the gravity and the resulting pressure and motion changes are decisive for the properties of the gravity wave. Wave reflection means for progressive water waves the discarding of a portion of their energy on a structure or in places where the configuration changes of the natural seabed. According to the reflection law of optics, any other part of the wave energy is propagated at the same time and the remaining portion through the processes of the wave breaking, of the liquid and the bottom friction etc. dissipated or absorbed, see FIG. wavelet transform, wave absorption. Thank you for supporting the creative commons movement !!

• published: 16 Sep 2014
• views: 96